HUH215 Alfine SG-S501 32 Hole Silver   $289.95

HUH217 Alfine SG-S501 36 Hole Silver   $289.95 $279.95 

HUH218 Alfine SG-S501 36 Hole Black   $289.95 $279.95 

Note: The 36 hole hubs are now coming bulk-packed from our supplier. They may have a few minor cosmetic blemishes (a nick or scratch).
The price has been adjusted accordingly.

The new Alfine SG-S501 8 speed internal gear hub features triple roller clutch engagement for the smoothest shifting yet!

HUH19 Nexus 8 Speed Premium "Red Band" Hub

We are currently not stocking this hub.

The premium "Red Band" model is lighter and has improved bearings compared with the SG-8R20 version.
Includes 19 tooth sprocket. Other sizes are available. (see Related items). Complete parts kit included.
Shifter sold separately

36 holes only.

Optional Rollerbrake ® BRC99 $28.95

This hand-operated drum brake fits Nexus and Nexave rear hubs with brake splines.

Not recommended for mountainous terrain.

Anti-rotation (non-turn) Washers

Internal gear hubs always require some system for preventing the axle from rotating, as it is used as part of the gear train. Like most other internal gear systems, Shimano uses tab washers that engage the dropout slot to keep the axle from turning.

Because the shift cable linkage ("cassette joint unit" in Shimano-speak) is also keyed to the axle, they make different types of anti-rotation washers to fit different dropout angles. You need to select the correct type of washers for your particular frame.

(Earlier Nexus hubs only used an anti-roatation washer on the right side, but newer models use a pair of them, each a mirror image of the other.)

The washers are color coded as shown in the chart.

Vertical Dropout Issues

The Nexus hubs were not originally intended for use with bikes that have vertical dropouts. The anti-rotation washers provided with the hub have the wrong orientation for use with vertical dropouts, and originally, Shimano said they could not be used with vertical dropouts.

Shimano has reconsidered, however, and now makes available an optional set of anti-rotation washers that work with vertical dropouts. Note that you will need either a pulley-type chain tensioner (or a rear derailer) or an eccentric bottom bracket, because vertical dropouts do not permit moving the axle back and forth to adjust the chain tension.

Shallow Dropouts (20 ° or less)	5R/Yellow, 5L/Brown	$12.95/pair
Shallow Dropouts (38 ° or less)	7R/Black, 7L/Gray	$12.95/pair
Track-type fork ends (0 °)	6R/Siler, 6L/White	$12.95/pair
Vertical Dropouts (60-90 °)	8R/Blue, 8L/Green	$12.95/pair

HUH030 Cable Anchor Bolt $3.95

Works with Alfine or Nexus (7 or 8 speed) hubs.
Sits in cassette joint.

HUH031 Nexus 8 Speed Cassette Joint $14.95

The Cassette Joint is the shift cable linkage unit.
Fixing ring included.
Click here for cable installation info.

HUH033 Nexus 8 Fixing Ring
Included with Cassette Joint. Not available separately.

The Fixing Ring locks the cassette joint onto the hub.
It is sold separately from the cassette joint.

Sprockets ("Cogs")

All Shimano internal-gear hubs use standard 3-spline sprockets, same as most other internal gear and coaster brake hubs.

In addition to the genuine Shimano Nexus (works with Alfine too) sprockets, that will work with either 1/8" or 3/32" chains, we also can supply most sizes in the Sturmey-Archer version, which is for 1/8" (wide) chains only.

Note that the Nexus and Alfine hubs require a dished sprocket, so sizes smaller than 16 teeth are not suitable for this application.

	Part #	Description	Width	Price (each)
	HUH056	Nexus Sprocket 16T	3/32" (narrow)	$14.95
	HUH058	Nexus Sprocket 18T	3/32" (narrow)	$14.95
	HUH059	Nexus Sprocket 19T	3/32" (narrow)	$14.95
	HUH060	Nexus Sprocket 20T	3/32" (narrow)	$14.95
	HUH061	Nexus Sprocket 21T	3/32" (narrow)	$14.95
	HUH062	Nexus Sprocket 22T	3/32" (narrow)	$14.95
	HUH063	Nexus Sprocket 23T	3/32" (narrow)	$14.95

Click here for Nexus 8-speed Service Manual

Sheldon Brown's Internal Gear Calculator for Internal Gear Hubs

Did You Ever Have A Three-Speed?

Do you remember how easily it shifted, even when you were stopped for a traffic light?

Do you remember how trouble-free it was?

Do you remember how the chain never fell off?

Do you remember how weather-proof the gear system was?

Do you remember how comfortable it was?

But...

You also probably remember the narrow range of gears, and the big jumps in between.

You probably remember the gap between gears, where your feet would spin freely, with no result.

You probably also remember how heavy your old "all steel" bicycle was,

and how badly the brakes worked in the rain...

The Good Without The Bad!

The Shimano Nexus group combines the best features of your old 3 speed, and eliminates the worst, thanks to modern materials and technology.

Nexus is a family of parts, but the most exciting part is the Nexus Inter 7 seven speed hub.

Shimano Nexus 7-speed hub

New! On-line Gear Calculator for Internally-Geared Hubs

The overall range is 244%, in jumps of:

For comparison, your old 3-speed had a range of 177%, in jumps of:

A typical 1970's "10 speed" had 8 usable gears, a range of 247%:

Other features of the Nexus system:

Nexus 7-speed internal gear systems also incorporate all-weather braking systems. They are available in two forms:

• Coaster (back-pedaling) brake

  or

• Hand operated "Rollerbrake ®" at the rear hub.

Both of these systems provide quite a good rear brake, which works as well in rain and snow as it does on a sunny spring afternoon.

There is also a front roller brake available, but, in my opinion, a conventional cantilever brake is better for the front. We would not particularly recommend the Nexus front brake.

 

Shimano Nexus 7 speed hubs. (See below for sprockets)
	36 holes. Shifter not included!
Shimano	Nexus 7 speed	(Coaster Brake)	$229.95	19 tooth	130 mm spacing
Shimano	Nexus 7 speed	(Rollerbrake®)	$219.95	19 tooth	130 mm spacing
Shimano	7-speed RapidFire Shifter for Nexus hubs		LD741 $34.95
Shimano	7-speed Revo Twist Shifter for Nexus hubs		LD742 $27.95
Shimano Nexus 4 speed hubs. Sorry, these hubs are discontinued, no longer available.
Shimano Nexus Inter 3 speed hubs.
Shimano SG-3C41	Inter 3 speed	(Coaster Brake)	HUH13 $85.95
120 mmspacing

Nexus Technical Page

Click here for Shimano Nexus lubricants.

The official Shimano Nexus page

 

We carry Nexus-equipped bicycles from several manufacturers, including:
Harris Cyclery's Exclusive Bianchi San Jos8
Breezer models with 8-speed, 7-speed, and 3-speed Nexus hubs
NEW! Jamis Commuter 3.0 An affordable, well-equipped commuter bike
Bianchi Milano with the new 8-speed Nexus hub
Come on in and test ride one soon, here or at your local dealer... you're in for a pleasant surprise!

See also my article on Internal Gear Hubs.

New! On-line Gear Calculator for Internally-Geared Hubs

Custom Wheelbuilding Wheels hand-built by Harris Cyclery We build custom wheels, with care and attention to detail. Standard charges:

• $40 each for wheels with 36 or fewer spokes.
• $45 for 40 spoke wheels.
• $50 for 48 spoke wheels.
• $10 for cutting out and prepping a used hub.
• Butted spokes (DT or Wheelsmith) $1.00 each.

We will re-use your old hubs if you wish, but will not use used spokes nor rims.

If you bring in existing wheels to be rebuilt, add $10 per wheel for cutting the old spokes, cleaning and prepping your hub.

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