I’ve had BB7s on my CX/road bike for about three years now and have just recently got some TRP Spyres.
I’ve only done one ride and only with the Spyre on the front but some initial thoughts:
– the Spyres are much neater/smaller
– the Spyre was a bit of a hassle to get set up but for no obvious reason though I think maybe it’s that with brand new pads, the pistons don’t retract quite enough to make it easy to avoid all brake rub and also possibly that my fork mounts are perfectly aligned which isn’t an issue with the BB7 orbital mounting system.
– The Spyre doesn’t work with my Hope floating rotors – the rivets catch on the bottom of the caliper
– The power of the Spyre is at least as good as the BB7 – or to put it another way, I didn’t really notice much difference either way
So basically they seem to work at least as well and are a bit lighter and neater. Can’t obviously comment on longevity or the avoidance of brake rub which seems to be the main issue people have with BB7s
FWIW, my BB7s will be for sale soon with a choice of rotors/mountings. Oh and the Hope floating rotors.