I use the Renthal rear sprockets as well. I have yet to break one, but they do wear out quiker. I ride the dunes alot, and the sand is hard on chains, and sprockets. The sand gets in the chain links and wears away at them. I have tried both o ring chains and non o ring chains, and it didnt seem to make much difference. Once the chain wears, and starts to stretch, the alloy sprockets start to get hooked pretty quik. I put a new chain and usually a new rear sprocket at the beginning of the dune season each year. I check chain deflection and sprocket wear befor every trip, and have yet to throw a chain, or break a sprocket. I also have a Pro Armor swingarm skid, that protects the chain and sprocket really well. Maybe I'm just lucky, but I think it has more to do with maintenance than luck.
Black/White 08 KFX 450
Black/White 08 KFX 700
White 06 Suzuki LTZ 400
Last edited by DirtyDawg; 09-30-2010 at 08:58 PM.