I've been riding my 2012 29 Scalpel 4 for about six weeks now and while on the really steep climbs (not sure what percentage) the drive train will skip, enough to make you stop in fear of causing some serious damage. The bike was only two weeks old the first time it happened. When I first got the bike I already had my mind made up to go with a Hope Pro hub on a Stan's Flow rim and last week I was able to make the swap...problem solved. I plan to take the wheel back to the shop for warrantee but thought I'd check in here to see if anyone else has had this problem.