I never had any problem with riding an aluminum/carbon bike on a trainer. No one ever told me not to do it. In fact once I brought the bike to the shop where I bought it and participated in a spinervals session with the owner/guy who sold it to me.
- Gray 2010 carbon WSD road bike, Rivet Independence saddle
- Red hardtail 26" aluminum mountain bike, Bontrager Evoke WSD saddle
- Royal blue 2018 aluminum gravel bike, Rivet Pearl saddle
Gone but not forgotten:
- Silver 2003 aluminum road bike
- Two awesome worn out Juliana saddles