A bit of psychedelic trance never does me wrong on the rollers. Problem is, the tempos are usually between 145 and 150 bpm, which doesn't really sync up well to cycling cadences. Sort of obscure stuff... people tend to either love it or hate it. Just thought I'd throw it out there. Lately I've been listening to (click links for low-quality samples):
Kindzadza - Waves From Inner Space (dark, noisy)
Azax Syndrome - Evolution (dark, more melodic, #5 is a Slayer cover)
Slug - Elemental (lighter stuff)
If you're interested let me know. I can recommend more stuff and individual tracks.