Description The Sturmey Archer 3 Speed Trike Hub TS-RF3 is a freewheel rear, internally geared hub. This hub is specific for tricycles, due to the sprocket being riveted to the hub body. Sturmey Archer 3 Speed Trike Hub TS-RF3 Specs Classic 3-speed internal gear hub with gear ratio of 177% Gear steps of 33% and 33% 6061 Aluminium hub shell 22 Teeth flange sprocket Compatible with 21 or 22 teeth sprocket Anodised alloy finish Weight – 1100g Supplied with Shift kit Check out the complete spec list from Sturmey here. And for instruction manuals if you’re building your wheel at home are here. Gear Ratio Overall Range – 177% Gear 1 – 75% (Gear 2 – 25%) Gear 2 – 100% (Direct Drive) Gear 3 – 133% (Gear 2 33%) WHEEL BUILDING USING DYNAMO HUBS Considering a dynamo conversion? We can help! Abbotsford Cycles has been hand building wheels for 25 years & we are passionate about the process. Give us a call, email or text… or just drop by our RICHMOND BIKE SHOP and we can talk wheels.