Sprockets ("Cogs")
All Shimano internal-gear hubs use standard 3-spline sprockets, same as most other internal gear and coaster brake hubs.
Replacement sprockets are listed on our Sturmey-Archer Parts Page.
Note that the Nexus and Alfine hubs require a dished sprocket, so sizes smaller than 16 teeth are not suitable for this application.
Sheldon Brown's Internal Gear Calculator for Internal Gear Hubs
Planetary Gears Are Back!
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
The overall range is 244%, in jumps of:
| 1st | 17.2% | 2nd | 13.8% | 3rd | 17.3% | 4th | 15.8% | 5th | 16.6% | 6th | 15.7% | 7th |
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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%:
| 42/28 | 16.6% | 42/24 | 20.0% | 42/20 | 3.1% | 52/24 | 14.0% | 42/17 | 5.2% | 52/20 | 17.7% | 52/17 | 21.3% | 52/14 |
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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.
Click here for Shimano Nexus lubricants.
We carry Nexus-equipped bicycles
from several manufacturers, including:
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NEW! Jamis Commuter 3.0 An affordable, well-equipped commuter bike
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Come on in and test ride one soon,
here or at your local dealer...
you're in for a pleasant surprise! |
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Custom Wheelbuilding
Wheels hand-built by Harris Cyclery
We build custom wheels, with care and attention to detail.
Standard charges: |
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- $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.
If you would like to make a link or bookmark to this page, the URL is:
http://harriscyclery.com/shimano-nexus.htm
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