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If you use a Brompton hub (or just the driver) with Shimano splines you can use a 12t.
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for my raleight Twenty with one and would need to use a cog around 12 or 13t
Need? 48/14×4/3×20"=91" top gear, which seems like more than you'd ever need on a shopping bike. Also 68" direct and 51" low are more than I'd want.
grams
gbj_tester
@M_V
Anyone know if small cogs work alright on Sturmey AW hubs? I'd like to build a wheel for my raleight Twenty with one and would need to use a cog around 12 or 13t. Some of the photos of them on ebay make it look like the chain might hit bits of the hub if a cog that small is used.