Rennen Single Speed Cogs are precision machined from aircraft quality 7075-T6 Aluminium (83% stronger than 6061) and polished to a beautiful lustre, offering the highest performance at the right price. Rennen Cogs are 3/16" thick at the Spline interface assuring that you won't damage your precious hubs. Only Rennen Cogs offer a single speed specific tooth profile which have been designed to extend tooth life. Get them way up in the 18/19T range to really experiment with that race gearing.
Weight: At 17 grams (16T) this makes Rennen Cogs one of the lightest on the market.
