Gear Ratios

2016-04-18
Sturmey Archer S-RF3 parts diagram



The Brompton BSR (standard ratio 3 speed hub) is essentially a relabelled Sturmey Archer S-RF3. The only differences are the washer and axle nuts used to bump the lock nut distance from 109mm to Brompton's 111mm. All the internal parts are identical.  




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