Originally Posted by
FlashBazbo
It appears that, if BMC calls this "inappropriate use," it could void the warranty. Since using it on a trainer is one of their handful of prohibitions, they might tend to call it that.
Sure, they could try to weasel out of warranty coverage, but how can they prove with 100% certainty that you used it in a trainer?
Other than this post, of course
Point being- It's unlikely to damage your frame unless you do something stupid, and if it does damage your frame it's difficult for them to lay the blame on a trainer. If you think the risk of a future warranty claim being denied is too high, consider a cheap backup aluminum bike for trainer use.