I have a high speed wobble problem with BOTH sets of aero wheels I own. Anything over 35-38 MPH going downhill results in a bad case of wobble and shake on the bike. (Yes, I know to squeeze my knees on the top tube, doesnt help at all). Its scary as hell and I am barely holding on at these speeds.
Me: 5'8", 142 lbs, 9 % BF, built like an ant (strong and skinny). Cross winds always bother me as I am light.
My set up: Parlee TT Bike, Zipp 646 wheels (set 1) and Zipp 343 (set 2). Both sets have tubulars (vittoria) that are taped on. Both sets of wheels exhibit the exact same high speed behavior on fast descents. Both sets are about 5 years old, new tires.
My daily training wheels (Bontrager RaceXLite) with clinchers go over 40-48 MPH with out even a shimmy. They feel great!
I checked the Zipps on a wheel trueing stand and they spin true.
So what gives? Why the wobble on both sets of Zipps and nothing on the clinchers? Any advice help is appreciated.
PS: I am doing IMMT in 2 weeks, and at this point I feel better and safer on the clinchers (though I am probably giving up just a bit of time with this choice)