Mark, I think you will find I have made the point about carrying a spare as well, usually linked to discussions about profiles/kings and ease of repair at a comp. Its easy to carry a spare crank and free wheel - so carry it, along with all other things its possible to carry and change in a comp. I first fitted a 108.9 in june last year. Since then I have had two new complete Bikes and switched parts onto frame I'm riding at the mo'. After the two euro WBC comps I put on a new 108.9 as a precaution, that makes it 3 108.9's since june. I think I spend more time riding than most, I ride when ever and where ever I want on any day I choose and I take full advantage of it, so my drive train gets trashed through use. I can spec White industry on my bikes and get them for free if I want, but I prefer the 108.9. I find the quick pick up an advantage. When I ride comps my goal is to win and I use the parts that suit me best to help me do that. Ben.