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Shimano Nexus Internal Gear Hubs:

Sprockets | Sheldon's Internal Gear Calculator

 
Shimano Nexus Inter 3 speed hubs.
Shimano
SG-3C41
Inter 3 speed with Coaster Brake

  • Includes parts kit sprocket
  • Shifter included
  • 36 Hole
  • 120 mm spacing
  • HUH13 $85.95

    buy button

    Shimano Nexus 7-speed Rapid Fire Shifter


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    Pre-Built Wheel w/Alfine 8 Speed Hub. Click here for details.

    Sprockets ("Cogs") $14.95 each buy button

    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 #DescriptionWidth
    Sturmey-ArcherHUH056Nexus Sprocket 16T 3/32" (narrow)
    Sturmey-ArcherHUH058Nexus Sprocket 18T 3/32" (narrow)
    Sturmey-ArcherHUH059Nexus Sprocket 19T 3/32" (narrow)
    Sturmey-ArcherHUH060Nexus Sprocket 20T 3/32" (narrow)
    Sturmey-ArcherHUH061Nexus Sprocket 21T 3/32" (narrow)
    Sturmey-ArcherHUH062Nexus Sprocket 22T 3/32" (narrow)
    Sturmey-ArcherHUH063Nexus Sprocket 23T 3/32" (narrow)

    Sheldon Brown's Internal Gear Calculator for Internal Gear Hubs

    Wheel Size
    Crank Length
    Gear units
    Chainring Size(s)
    Rear Sprocket Size
    Internal Hub

    Gain Ratios

    Gear Inches

    Meters Development

    Spoke Divider
     
    Nexus Hub Cutaway
    Planetary Gears Are Back!

    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:

    1st17.2%2nd13.8%3rd17.3%4th15.8%5th16.6%6th15.7%7th

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

    1st33%2nd33%3rd

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

    42/2816.6%42/2420.0%42/203.1%52/2414.0%42/175.2%52/2017.7%52/1721.3%52/14

    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.

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    DESCRIPTION

    Click here for Shimano Nexus lubricants.

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    See also my article on Internal Gear Hubs.

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

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