We have designed a universal stainless steel torque arm which we are having manufactured by a local metal shop here in Vancouver. These will slide over both 12mm and 14mm axles, and the two piece design will adapt to virtually any fork style or dropout angle. Although not strictly required, a torque arm does reduce the likelihood of an axle spinout and is particularly useful with higher torque motors that use small 12mm axles such as the Nine Continent hubs.