Axle Rear Hub

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Axle Rear Hub
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Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set 6.7
Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set 6.7"
Paypal   US $10.80
04 HONDA RANCHER 350 LEFT REAR AXLE HUB
04 HONDA RANCHER 350 LEFT REAR AXLE HUB
Paypal   US $30.00
04 HONDA RANCHER 350 RIGHT REAR AXLE HUB
04 HONDA RANCHER 350 RIGHT REAR AXLE HUB
Paypal   US $30.00
1998 Honda XR70 Rear Rim Xr 70 98 wheel axle hub disc spokes
1998 Honda XR70 Rear Rim Xr 70 98 wheel axle hub disc spokes
Paypal   US $101.00
Bicycle Bike Rear Hub Axle Repair Parts 6.8
Bicycle Bike Rear Hub Axle Repair Parts 6.8" Length
Paypal   US $7.40
6.7
6.7" Length Bike Replacement Rear Hub Axle Repair Parts
Paypal   US $8.54
5 Pcs Black Metal Rear Hub Axle Screw Nut for Bicycle
5 Pcs Black Metal Rear Hub Axle Screw Nut for Bicycle
Paypal   US $6.39
05 06 SUZUKI GSXR 1000 GSXR1000 CUSH DRIVE HUB AXLE FRONT REAR 41 SPROCKET #1921
05 06 SUZUKI GSXR 1000 GSXR1000 CUSH DRIVE HUB AXLE FRONT REAR 41 SPROCKET #1921
Paypal   US $29.99
06 07 SUZUKI GSXR750 GSXR 750 600 CUSH HUB DRIVE REAR AXLE OEM #0739
06 07 SUZUKI GSXR750 GSXR 750 600 CUSH HUB DRIVE REAR AXLE OEM #0739
Paypal   US $19.99
SA Rear Sturmey-Archer axle nuts for 3 speed hubs
SA Rear Sturmey-Archer axle nuts for 3 speed hubs
Paypal   US $4.98
07 08 09 10 HONDA CBR600RR CBR 600RR 600 CUSH REAR HUB SPROCKET AXLES OEM #0331
07 08 09 10 HONDA CBR600RR CBR 600RR 600 CUSH REAR HUB SPROCKET AXLES OEM #0331
Paypal   US $19.99
08 09 YAMAHA YZFR6 R6 R MODEL CUSH HUB DRIVE AXLES FRONT REAR AXLE SPROCKET 6006
08 09 YAMAHA YZFR6 R6 R MODEL CUSH HUB DRIVE AXLES FRONT REAR AXLE SPROCKET 6006
Paypal   US $29.99
03-09 2005 YAMAHA YZFR6 R6 R6S CUSH DRIVE HUB 48T SPROCKET AXLES FRONT REAR 6176
03-09 2005 YAMAHA YZFR6 R6 R6S CUSH DRIVE HUB 48T SPROCKET AXLES FRONT REAR 6176
Paypal   US $29.99
06-09 TRIUMPH DAYTONA 675 CUSH HUB DRIVE 47T SPROCKET REAR AXLE  #5515
06-09 TRIUMPH DAYTONA 675 CUSH HUB DRIVE 47T SPROCKET REAR AXLE #5515
Paypal   US $29.99
SUZUKI 2005 VL800 C50 BOULEVARD SPOKED REAR WHEEL 15
SUZUKI 2005 VL800 C50 BOULEVARD SPOKED REAR WHEEL 15" WITH BRAKE HUB & AXLE
Paypal   US $29.99
Bicycle Bike Rear Hub Axle Repair Parts 6.8
Bicycle Bike Rear Hub Axle Repair Parts 6.8" Length
Paypal   US $6.95
YAMAHA 1982 XT250 XT 250 SPOKED REAR WHEEL 17
YAMAHA 1982 XT250 XT 250 SPOKED REAR WHEEL 17" WITH AXLE, BRAKE HUB & SPROCKET
Paypal   US $19.99
HONDA 1984 CR250 CR250R CR 250 SPOKED REAR WHEEL 18
HONDA 1984 CR250 CR250R CR 250 SPOKED REAR WHEEL 18" WITH AXLE, HUB & SPROCKET
Paypal   US $19.99
HONDA 1973 XL250 XL 250 REAR BRAKE HUB & AXLE
HONDA 1973 XL250 XL 250 REAR BRAKE HUB & AXLE
Paypal   US $6.99
36 hole Rear BMX Black Stealth Street hub 14mm axle 110mm dropout
36 hole Rear BMX Black Stealth Street hub 14mm axle 110mm dropout
Paypal   US $230.00
Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set Replacement
Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set Replacement
Paypal   US $6.99
02 03 04 HONDA CRV L. LEFT DRIVER LH REAR STUB AXLE KNUCKLE HUB CARRIER W/O ABS
02 03 04 HONDA CRV L. LEFT DRIVER LH REAR STUB AXLE KNUCKLE HUB CARRIER W/O ABS
Paypal   US $89.00
Campagnolo 1980's Gran Sport rear hub axle combo (NOS)
Campagnolo 1980's Gran Sport rear hub axle combo (NOS)
Paypal   US $39.00
Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set Replacement
Bicycle Bike Hub Cones Locknuts Washers Rear Axle Set Replacement
Paypal   US $7.16
2001 01 Honda CR125 CR 125 Rear Wheel Rim Tire Rotor Axle Hub
2001 01 Honda CR125 CR 125 Rear Wheel Rim Tire Rotor Axle Hub
Paypal   US $99.00
00 01 02 03 04 05 TOYOTA CELICA RIGHT PASSENGER RH REAR STUB AXLE HUB CARRIER GT
00 01 02 03 04 05 TOYOTA CELICA RIGHT PASSENGER RH REAR STUB AXLE HUB CARRIER GT
Paypal   US $79.00
2003 03 YZ250F YZF 250 YZ 250F Rear Wheel Rim Tire Rotor Axle Hub
2003 03 YZ250F YZF 250 YZ 250F Rear Wheel Rim Tire Rotor Axle Hub
Paypal   US $125.00
1996 POLARIS XPLORER 300 4X4 RIGHT REAR AXLE HUB NUTS WASHERS SPORTSMAN 335 500
1996 POLARIS XPLORER 300 4X4 RIGHT REAR AXLE HUB NUTS WASHERS SPORTSMAN 335 500
Paypal   US $24.95
1996 POLARIS XPLORER 300 4X4 LEFT REAR AXLE HUB NUTS WASHERS SPORTSMAN 335 500
1996 POLARIS XPLORER 300 4X4 LEFT REAR AXLE HUB NUTS WASHERS SPORTSMAN 335 500
Paypal   US $24.95
Losi  XXX  SCT XXXT truck  dogbones driveshafts  axles rear hub
Losi XXX SCT XXXT truck dogbones driveshafts axles rear hub
Paypal   US $.99
Honda 250R 250 R ATC ATC250R OEM Rear Axle Hubs Hub
Honda 250R 250 R ATC ATC250R OEM Rear Axle Hubs Hub
Paypal   US $11.50
00 01 02 03 04 05 TOYOTA CELICA L. LEFT DRIVER LH REAR STUB AXLE GT HUB CARRIER
00 01 02 03 04 05 TOYOTA CELICA L. LEFT DRIVER LH REAR STUB AXLE GT HUB CARRIER
Paypal   US $79.00
2003 YAMAHA kodiak 4x4 grizzly   REAR AXLE  WHEEL HUB
2003 YAMAHA kodiak 4x4 grizzly REAR AXLE WHEEL HUB
Paypal   US $9.99
6.7
6.7" Length Bike Replacement Rear Hub Axle Repair Parts
Paypal   US $8.07
Vintage Phillips Raleigh bicycle 3/8
Vintage Phillips Raleigh bicycle 3/8" hub spindle rear axle nuts pair NOS NEW
Paypal   US $9.00
John Deere G Rear Wheel Axle Hub
John Deere G Rear Wheel Axle Hub
Paypal   US $165.00
Bicycle Bike Rear Hub Axle Repair Parts 6.8
Bicycle Bike Rear Hub Axle Repair Parts 6.8" Length
Paypal   US $7.40
Axial AX10 / SCX10 Hub Carriers Axle Lockouts Honcho Front / Rear New! AX80012
Axial AX10 / SCX10 Hub Carriers Axle Lockouts Honcho Front / Rear New! AX80012
Paypal   US $10.50
89 COUGAR XR-7 L. LEFT DRIVER LH REAR STUB AXLE DISC BRAKES HUB CARRIER KNUCKLE
89 COUGAR XR-7 L. LEFT DRIVER LH REAR STUB AXLE DISC BRAKES HUB CARRIER KNUCKLE
Paypal   US $99.00
74 honda xl 70 rear brake hub and axle
74 honda xl 70 rear brake hub and axle
Paypal   US $19.99
9.1mm Dia Thread Washer Bicycle Rear Axle Hub Cone Nut
9.1mm Dia Thread Washer Bicycle Rear Axle Hub Cone Nut
Paypal   US $6.63
Campagnolo Super Record Hub Rear Axle NOS
Campagnolo Super Record Hub Rear Axle NOS
Paypal   US $30.00
99 00 01 02 03 04 OLDS ALERO R. PASSENGER RIGHT RH REAR STUB AXLE KNUCKLE HUB
99 00 01 02 03 04 OLDS ALERO R. PASSENGER RIGHT RH REAR STUB AXLE KNUCKLE HUB
Paypal   US $79.00
9.1mm Dia Thread Washer Bicycle Rear Axle Hub Cone Nut
9.1mm Dia Thread Washer Bicycle Rear Axle Hub Cone Nut
Paypal   US $6.66
69-75 76 77 78 FIAT 124 CONVERTIBLE REAR AXLE ASSEMBLY DIFFERENTIAL CARRIER HUBS
69-75 76 77 78 FIAT 124 CONVERTIBLE REAR AXLE ASSEMBLY DIFFERENTIAL CARRIER HUBS
Paypal   US $399.00
Chrome Semi Truck Rear Axle Cover w Removable Hub Cap
Chrome Semi Truck Rear Axle Cover w Removable Hub Cap
Paypal   US $10.00
1958 Matchless 650 G12 CS Rear Wheel Dunlop 18 AMC025 Rim Drum Hub Axle Sprocket
1958 Matchless 650 G12 CS Rear Wheel Dunlop 18 AMC025 Rim Drum Hub Axle Sprocket
Paypal   US $9.99
New LOSI TEN-SCTE 4WD FRONT AND REAR DRIVESHAFTS CVD AXLES,HUBS,SPINDLESLOSB0128
New LOSI TEN-SCTE 4WD FRONT AND REAR DRIVESHAFTS CVD AXLES,HUBS,SPINDLESLOSB0128
Paypal   US $21.19
New SLASH 4X4 VXL Front and Rear Driveshaft/Axle Set with Hubs Carriers... 6808
New SLASH 4X4 VXL Front and Rear Driveshaft/Axle Set with Hubs Carriers... 6808
Paypal   US $27.40
2005 05 Honda CRF250 CRF 250 CRF250R Rear Wheel Rim Tire Rotor Axle TALON Hub
2005 05 Honda CRF250 CRF 250 CRF250R Rear Wheel Rim Tire Rotor Axle TALON Hub
Paypal   US $187.50
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Pinhead Bicycle Locking Skewer Set, 3 Pack Pinhead Bicycle Locking Skewer Set, 3 Pack
List Price: $64.99
Sale Price: Too low to display

3-pack includes 100mm front and 135mm rear locking skewers, plus seatpost lock.

Delta Axlerodz Bolt On Bicycle Skewers (1 Pair) Delta Axlerodz Bolt On Bicycle Skewers (1 Pair)
List Price: $14.99
Sale Price: Too low to display

Delta Axle Rodz Quick Release Skewer PairsItem SpecificationsColorSilverShaftCrMoSkewer UseRearItem Specifications- FrontColorSilverShaftCrMoSkewer UseFrontFront Axle Type9x1Item Specifications- RearColorSilverRear Axle Type10x1

OnGuard 3 Piece Locking Skewers OnGuard 3 Piece Locking Skewers
List Price: $64.95
Sale Price: $45.99

Replaces existing wheel and seat quick releases. Cold forged steel. One key unlocks all three.

BOB Quick Release, BOB (126Mm-140Mm) BOB Quick Release, BOB (126Mm-140Mm)
List Price: $27.50
Sale Price: Too low to display

BOB Trailer Quick Release SkewersFits standard 135mm dropouts(spacing)Fits a range of 126-140mm spacing

Traxxas Carriers, Rear Stub Axle, Left & Right: Jato Traxxas Carriers, Rear Stub Axle, Left & Right: Jato
List Price: $3.50
Sale Price: $2.80

These are the Rear Left and Right Stub Axle Carriers for the Traxxas Nitro Jato Stadium Truck.

Traxxas Rear Hub Carriers: Nitro 4-Tec Traxxas Rear Hub Carriers: Nitro 4-Tec
List Price: $24.00
Sale Price: $17.51

Stub Axle Carriers 1.5 Degree, 4-Tec

New Holland Combine TR75 TR85 & TR95 Harvester 1890 1895 1900 & 2100 Powered Rear Axle Torque Hub Service Manual New Holland Combine TR75 TR85 & TR95 Harvester 1890 1895 1900 & 2100 Powered Rear Axle Torque Hub Service Manual
Sale Price: $48.95

Our New Holland Combine TR75 TR85 & TR95 Harvester 1890 1895 1900 & 2100 Powered Rear Axle Torque Hub Service Manual is a high-quality reproduction of factory manuals from the OEM (Original Equipment Manufacturer). Tractor service manuals (tractor shop manual / repair manual) provide detailed service and repair information for your tractor, with step-by-step instructions on how to repair your farm tractor or other machine. Pick one up today and save yourself time and money on any repair!

New TRAXXAS Low-Profile Spiked Tires 2.2 New TRAXXAS Low-Profile Spiked Tires 2.2" Popular High Quality Practical Modern Design
List Price: $31.60

The design of this product is very exquisite and beautiful.

Fulcrum Inner Rear Axle Sleeve for Racing 5/7 Fulcrum Inner Rear Axle Sleeve for Racing 5/7
List Price: $14.00
Sale Price: $9.80

Fulcrum Axle CapsFits Fulcrum Racing 5 and 7 rear hubsAlso fits Campy Scirocco, Vento and Khamsin rear hubsItem SpecificationsFitsRacing 5/7, Campy Scirocco, Vento and Khamsin Rear Hubs

OTC 4579 9-Way Slide Hammer Puller Set OTC 4579 9-Way Slide Hammer Puller Set
List Price: $139.95
Sale Price: $70.95

Internal and External Jaws provide a variety of combinations to pull bearings, gears and seals Pulls Flange-type rear axle and most front wheel drive hubs Set includes grip wrench adapter and dent puller Two and three-way cross blocks and cone provide perfect jaw configuration for many jobs Packaged in a blow molded case for easy storageThis 9 way slide hammer puller set is designed for use with other OTC 5/8" - 18 thread slide hammer attachments. Includes 2 way cross block, front hub puller, internal 3 jaw puller, external 3 jaw puller, rear axle puller, internal 2 jaw puller, external 2 jaw puller, grip wrench adapter, dent puller and puller hook. 5 lb. hammer in polished chrome finish.


Here are some more information for Axle Rear Hub:
Axle Rear Hub

There are a lot of items to consider when making the purchase of a new electric scooter. If you have followed my previous articles, then you already know what to look for in a reputable dealership, drive train, and electrical system on an electric mobility scooter. Now it is time to learn what to look for in a good scooter chassis.

The chassis, also known as the frame structure, is what makes up the overall body of a scooter. It is usually constructed of tubular steel and includes a deck area for you to stand upon. However, in some cases aluminum or plastic might also be used in the frame structure. When selecting your new electric scooter, it is best to avoid any models where plastic is used on the frame or decking area of the chassis since it is extremely susceptible to cracking, breaking, or warping. You will probably find that plastic is commonly used for the construction of the body panels -- this is perfectly fine.

The frame structure will also include some sort of rear suspension system that is designed to increase the handling characteristics and also to cushion your ride on the scooter. Rear suspension models will usually show the type of suspension and the amount of travel the suspension features. This is usually measured in millimeters (mm) where 25.4mm is equal to about one inch. Therefore, a 50mm travel fork has just less than two inches of travel.

The system for holding the front wheel in place is known as "the forks". Many transportation scooters include a solid front fork. However, some of the higher quality scooters also include some sort of suspension system built into the front forks similar to that of the rear. This suspension system uses a combination of either metal or rubber springs that provide for a softer, cushioned ride.

The wheel assembly of an electric scooter includes the axle, hub, spokes, and rim. The wheels are available in steel, aluminum, or reinforced plastic. Anyone seeking long term use of a scooter should avoid purchasing one that includes the plastic wheel option since those are more prone to cracking or breakage. The options available for wheels include a choice of wire spokes, solid spokes, or a solid spoke-less design.

The rim is the outside part of the wheel that holds the rubber tire in place. Aluminum rims offer a more superior quality in terms of look and wear. However, steel rims can be a cheaper alternative since they can be usually be found at lower prices, but typically they don't last as long or look as nice. Steel rims are also more prone to paint chipping and rust. Many newer scooter models also offer an option for alloy rims.

Most electric scooter tires are made of rubber, foam rubber, or polyurethane. The tire styles can vary greatly in terms of the materials included. You will usually find a choice of tubeless pneumatic, pneumatic with an inner-tube, or solid tires. They are also available with either a smooth, semi-smooth, or knobby tread surface. The overall tire size will have an effect on the given performance of your scooter. Taller tires will generally increase the top speed but may lower your ability to climb hills. Taller tires will also serve to increase the ground clearance of an electric scooter. This increased ground clearance will allow the scooter to better handle speed bumps, pot holes, curbs, or any sort of off-road terrain. Short tires are known to increase the hill climbing ability of a scooter, but will lower the top speed. Shorter tires will also decrease ground clearance. The width of your tires can also have an effect on the scooters ability to grip the road. Wide tires are commonly known to increase traction while the skinny tires will have the opposite effect.

Well, that about wraps it up for the basic information you need to arm yourself with before making the purchase of a new electric scooter. Be sure to review my previous articles covering the other major systems that make up a typical electric mobility scooter. Understanding how these systems work together will give you the confidence needed to make a smart purchase of a new scooter, along with its day-to-day operation and maintenance.

James Stockton is a Scooter enthusiast that likes to share information with other scooter drivers throughout the world. To learn more about electric scooters and mobility scooters, be sure to visit: http://www.ElectricScooterOutlet.com.

Bicycle Drivetrain Guide

Your bicycle's drivetrain is comprised of all of the parts that power the bicycle and make it go. Bike pedals move the cranks, which turn the bottom bracket and the chainrings, which drive the chain that spins the rear sprockets, turning the rear hub, which moves the wheel and propels the bicycle forward. The crisp movement of these parts and the ability to minimize effort while maximizing speed is the heart of cycling. It is essential that drivetrain be clean, true and well-maintained in order to more fully enjoy riding your bike. When one of these parts gets out of whack, the rest soon follow.

It is also important to get individual components that are compatible within the system (e.g. typically Campagnolo and Shimano parts are not inter-compatible). Many times the difference between 9- and 10-speed parts is enough to make them incompatible as well. The collective term for a complete bike drivetrain kit is "group" or "gruppo." Multi-speed drivetrains are classified by the number of cogs in the rear cassette. A modern day 10-speed bicycle can have as many as 30 "possible gears," with 10 in the rear and three in the front, but still have a 10-speed drivetrain.

Pedals
Your bike pedals are your power connection to your bicycle. As you pump your legs and turn your feet, you cause the cranks to turn. Proper pedal choice is important for comfort, control and safety on the bike. Many recreational and enthusiast cyclists prefer the adaptability that platform pedals offer. They allow you to ride in any type of shoe and give a sense of security to a novice rider who is cautious of locking the feet into clipless pedals. Many platform pedals can be adapted with a toe cage to give more control and power while retaining the sense of security associated with platforms.

Racers and more advanced riders often prefer "clipless" pedals. These pedals are used in conjunction with matching cleats that are attached to special shoes. The cleats lock into place in the pedal, offering a secure attachment of rider to bicycle. Most cleats easily release the shoe by a simple twist of the ankle, and they are quite easy to use with some initial practice.

Cranks
The cranks connect the pedals to the bottom bracket and hold the front chainrings. They connect to the axis around which your feet spin and transmit your power to the bike. Cranksets come in many different lengths based upon bicycle frame size and the rider's leg length. They are generally made out of aluminum, but some low-end cranks are made of steel, and some high-end cranks are made of carbon fiber. These cranksets are marketed to top-level racers and generally carry the appropriate price tag. Cranks attach to the bicycle at the bottom bracket. There are several types of cranks/bottom bracket interfaces, and it is important to know their differences.

Chainrings
Chainrings are the forward chain interface with the bicycle. They contain teeth that hold the chain and drive it forward. Chainrings come in a wide range of sizes, identified by the number of teeth and application. Typical mountain bikes use three chainrings; road bikes generally have two to three. Single-speed and fixed-gear bicycles use only one chainring. Chainrings are typically made of aluminum, with some being made of steel and a handful of boutique brands making them out of carbon fiber.

What makes a proper chainring is dependent upon many factors: number of teeth, single/double/triple configuration, 8/9/10/11 speed use and bolt circle diameter. Once all of those factors have been determined, you can choose the group level or brand that best suits your needs.

Bottom bracket
The bottom bracket is the cranks' interface with the bike. It contains bearings around which an axle rotates; this axle is connected to the cranks. Current bottom brackets come in varying interface types. Traditional bottom brackets have loose ball bearings with their accompanying cups and cones and an axle locked in place with locknuts, typically on the left side of the BB shell. More recent cartridge bottom brackets are built as one piece with cartridge bearings press-fit onto the axle and fit into the frame with "cups" that thread into opposite sides of the shell.

Many bike parts companies have most recently been developing bottom brackets without an axle. The axle is built into the cranks and runs through bearings that are press-fit into cups that thread into the bottom bracket shell. The other end of the axle then attaches to the opposite crankarm. Different brands have different bearing sizes and only work with their respective cranks.

Bottom brackets come in many different interfaces developed by the different component manufacturers. Cup and cone BBs are generally "square taper." Cartridge bottom brackets are one of two versions of square taper (International Standard or Japanese Standard) or one of the many versions of splined BB developed by the several companies.

Another important aspect of bottom bracket compatibility is whether your bicycle has an Italian or English threaded bottom bracket. The shell diameter of an Italian bottom bracket is larger, threaded 36 mm x 24 tpi, and its threads are both normal (or right-handed). English bottom brackets are threaded 1.370-inch x 24tpi, with the right cup having a reverse thread and the left cup having a regular thread.

Chain
The chain connects the chainring to the rear sprocket, transmitting power from the rider to the rear wheel. Current bicycles use roller chains (with few exceptions) that are categorized by pitch and width. The chain's pitch is the distance from roller to roller and is typically 1/2 inch on modern bicycles. The width is measured between chain plates and is either 1/8 inch for derailleur-less bikes and 3/32 inch for multi-speed, derailed bikes.

Another specification of a bicycle chain is based on outer width: the outside distance between chain-link plates. There are two main standards: Campagnolo and Shimano. Shimano uses the same width chain for all drive trains with eight or fewer gears in the rear cassette or freewheel and a different width each for its 9- and 10-speed groups. Campagnolo uses three widths presently: 9, 10 and 11. As the number of sprockets in the rear increase, the width of the chain must decrease, providing enough clearance for the extra gears. Other companies manufacture chains that are designed to work with the Campy and Shimano systems.

Derailleurs
On multi-speed bicycles, the derailleur moves the chain from one sprocket to another. They are actuated by a cable pulled from the shifters, typically mounted onto the handlebars (and sometimes down tubes) of the bicycle.

Front derailleur
The front derailleur moves the chain from chainring to chainring and acts as a chain guide, keeping the chain aligned. There are several chainring characteristics to consider when shopping for a front derailleur. The most important is double or triple (whether there are two or three chainrings attached to the crank). A triple front derailleur is designed with a deeper inner cage than a double derailleur to be able to push the chain up from the small ring.

Another key characteristic is chainring size. Certain derailleurs' cage diameters limit the maximum number of teeth possible on the large ring. The final characteristic is 8/9/10-speed compatibility. The width between the inner and outer cage varies between designs and may not work well when used with the wrong gearing.

Rear derailleur The rear derailleur acts as a chain guide and chain tensioner. As the chain moves from a large sprocket to a smaller one, it needs less chain to cover the circumference. The rear derailleur has a spring mechanism that pulls in that extra length of chain, known as "chain wrap." The rear derailleur also moves the chain from cog to cog and is one of the more active components of the bicycle. As you pedal and drive the chain around the chainrings and rear sprockets, the chain continuously runs through the rear derailleur.

Rear derailleurs are classified in the same manner as front derailleurs--first by speed: 8/9/10, then by double or triple (it is actually the difference between the largest and smallest chainring added to the difference between your largest and smallest cog). Typically, with a double chainring you can use a short cage and with a triple you would need a long cage. The longer cage helps take up the extra slack that appears when in the small ring.

Rear sprocket
The rear sprocket is the chain's rear interface with the bicycle. On a single speed (fixed gear included) you only use one rear sprocket, or cog. Multi-speed bikes have a cluster of cogs called "cassettes" or "freewheels."

A freewheel is a group of cogs fixed to a "freewheel" mechanism that allows you to coast; there is a ratcheting mechanism that allows the rear hub to spin as you coast, or ride without pedaling. A bike cassette is designed to be used with a rear hub equipped with a freewheel mechanism to which you attach the cogs.

Typical freewheels come in 5- to 7-speed versions, and cassettes are 8/9/10/11-speed, with few exceptions. Cassette cogs are designed to be set up in a particular orientation to aid in shifting; any variation of this orientation can cause serious shifting and safety issues. Cassettes are designed to be used with the appropriate chain, and the wrong chain won't ride on the teeth properly, resulting in a very poor and annoying ride.

Rear hub
The rear sprocket is attached to the hub directly (in the case of a fixed gear), or via a freewheel mechanism. The power from the front chainring is transmitted via the chain to the rear sprocket and into the rear hub, the central point of the rear wheel. The two main characteristics of a rear hub are hub type (cassette, freewheel or fixed) and hub spacing (the width from axle end to axle end). Modern road bikes are spaced to 130mm, mountain bikes to 135mm and track bikes to 120mm. Older bicycles were spaced to 126mm. They were typically designed for use with freewheel-type rear hubs that carried fewer gears.

With the advent of the freewheel hub and more gears, the rear dropout spacing was increased to accommodate. Another thing to consider when choosing a hub (if it is already built as part of a wheel) is the wheel diameter. The rim must be the appropriate size to fit into the frame and line up with the brake pads.

I suggest Bike Wagon for bike parts.

About the Author

Jon Carter is an avid cyclist and loves to write on the subject.  Make sure to go check out Bike Wagon for all your biking needs.

rear hub axle spacer?

....yes

BMW Presents the Concept of a New 4-Door Coupé
MULGRAVE, AUSTRALIA – April 27, 2010: With an exclusive Design Night on the evening of the first press day at Auto China in Beijing, BMW provides an in-depth insight into its design philosophy and development strategy.

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