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  • Shimano SG-7C20 Nexus Sprocket (21T)
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Shimano SG-7C20 Nexus Sprocket (21T)

by Shimano

Price: $7.00 & FREE Shipping
In stock.
Usually ships within 2 to 3 days.
Ships from and sold by Wheel & Sprocket.
  • Will also fit any 3 tabbed coaster brake or internally gear hub
  • Will work with either 1/8" or 3/32" chains
  • Shimano Reference Number: SG-7C20
10 new from $4.59

Great Outdoors Savings Event Great Outdoors Savings Event

$7.00 & FREE Shipping In stock. Usually ships within 2 to 3 days. Ships from and sold by Wheel & Sprocket.

Frequently Bought Together

Shimano SG-7C20 Nexus Sprocket (21T) + Shimano SG-3C40 Nexus Sprocket (23T)
Price for both: $13.10

Buy the selected items together

Technical Details


Product Description

Shimano Alfine and nexus cogs work with either a 1/8 or 3/32 chain. Will also fit any 3 tabbed coaster brake or internally gear hub.

Product Details

  • Product Dimensions: 3.2 x 3.2 x 0.5 inches
  • Shipping Weight: 1.6 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B007FOVNPK
  • Item model number: Y33060000
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (4 customer reviews)
  • Amazon Best Sellers Rank: #318,198 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Customer Reviews

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Most Helpful Customer Reviews

1 of 1 people found the following review helpful By SatchmoDan on February 16, 2014
Verified Purchase
This went onto my Mongoose Beast with the stock chain. It's a bit tight with the stock chain, but works. I might have to add a link to my chain.
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1 of 1 people found the following review helpful By Fred Foster on December 7, 2013
Verified Purchase
Well made shape offset correct chrome fit to hub. Fit the Mongoose Beast added new chain also. Great to have a custom size for my bike.
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By Benjamin Chou on September 18, 2013
Verified Purchase
Not much to say about these 3 spline coaster cogs. This offering from Shimano is robust, well finished, and functions as it should. One thing to note is it is dished so depending on which direction it is installed, the chain line can be altered to suit your needs.
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By larry flick on September 6, 2014
Verified Purchase
worked perfectly! now my mongoose beast is a pleasure to ride.
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