Join Date: Jul 2006
Bikes: 2006 Raleigh Cadent 2.0, 2013 Trek Madone 3.1, 2015 Propel Advanced SL 2, 2000 K2 Zed SE
I think tailbone pain (if you haven't bruised it in a fall or something) is generally on-bike posture related.
Next time you're OK to get in the saddle, try to keep your back arched a bit and see if that helps. It might be a bit tough if your core strength and flexibility aren't there yet.
Otherwise, I think I'll defer to someone with more expertise.
I didn't think anyone loved riding on a trainer.
I think it's tolerable while watching the numbers on Trainer Road, but barely. But since it's the only way I can really ride (MN is dropping back to -18F this week because we're pulling down more air from the polar vortex, oh yeah) I do it.
Oh, and nice bike. Hopefully you can figure out the cause of the tailbone pain, it'd be a shame to have that keep you off the bike since you say you enjoy it so much.