I just bought a MeFoto Roadtrip travel tripod and am very happy with it. Small, light, decent head that can pan. certainly would be easy to take with you on your bike. mefoto.com for more info. I also tried a befree from Manfrotto but returned it, not as stable and the head can't pan, has no level built in.
mefoto comes with a nice bag, uses a regular allen wrench, not some odd thing (so if you loose the supplied one a new one is cheap and easy to find, probably even in your garage) and the head is much better. Also uses 'universal' clamp in the Arca Swiss design.

). But other than that, I've purchased Adorama Flashpoint F-2 ballhead for $50, and there you go. Tripod + ballhead for $75.
