Phil Wood introduced the now-standard Field Serviceable Axle (FSA) in 1991. The FSA design enables the axle to be separated from the hub after unthreading the end caps using two hex wrenches. The quick release axles use a 5 mm hex wrench and the bolt axle hubs use an 8 mm hex wrench. Our axles are threaded externally, with the end caps threaded to exactly match the axle thread. The hubs use shouldered axles that precisely position the bearings.
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