Ok, so I'm looking to buy a bike to use for TT's and I'm a bit confused about what's legal now. Now these TT's won't be anything over 3/4 local races and maybe the 4 race at Fitchburg. What I'm confused about is what frames are legal to race. Funnybikes, cable frames like the Slingshot, Trek Y Foil and Y Foil-type frames, converted road bikes, dedicated TT bikes and Tri bikes. I was under the impression that Funnybikes, Cable bikes and Y-Foil designs were no-no's but I can't seem to find the coresponding section in the USAC handbook. So can someone out there help me narrow my options down? Thanks.