Gear Ratios
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2025-06-20
Calculation of Shifting Cadence for Sturmey Archer A2H
The calculation is solely based on official Sturmey Archer information that the hub shifts at 1... more
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2020-06-09
Hubsmith Rear Hub - Freehub body (hub driver) comparison
The Hubsmith rear hub can come with a number of freehub bodies. The standard 2 speed is the def... more
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2018-11-29
Brompton BWR Parts Diagram
Although the BWR hubs are exclusive to Brompton, many of the internal parts are shared with it&... more
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2016-04-21
Brompton BWR Gear Ratio
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2016-04-20
Suggested Chain Length
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2016-04-18
Brake levers & compatible brake cables
Brompton brake lever desig1 have evolved through the yea1. The clevis, or the bracket that hold... more
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2016-04-18
Sturmey Archer S-RF5(W) (N) Parts Diagram
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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.... more
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2016-04-13
2 Speed Gear Ratios
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2016-03-12
S-RF3 / BSR ratios
Typical cruising gea1 are in the 80s gear inches and climbing gea1 are 30s gear inches. Howeve... more
