Been road riding for 30 years on at least 15 different bikes. I have a Raleigh Militis carbon frame that has a bad speed wobble. It is a really nice carbon frame with an aero down tube that weighs 880 grams.
At about 40-42 mph, the front end starts shaking violently. I have experienced this on about 4 different road descents, over multiple rides and years. I regularly ride mountains that gain or lose 1000-1500 vertical. It has a 120 mm stem, sized 55cm bike, stem slammed. I have even "played" with it trying to see if clamping my knees to the top tube or braking (which makes it worse) stop it.
What has mattered a lot is wheel choice. Ksyrium SL wheels: has speed shake, Campy Zonda wheels: none, Hed Jet 6+ - speed shake at 35 MPH awful. I think the fork / front wheel choice is the main issue, the commonality of the Ksyrium SL and the Hed is that they are both big wind dams in the front end.
I am just going to sell it. I have an older titanium / carbon Serotta that is a downhill carving machine, feels steady as a rock and you can rip down any descent at warp speeds.
At about 40-42 mph, the front end starts shaking violently. I have experienced this on about 4 different road descents, over multiple rides and years. I regularly ride mountains that gain or lose 1000-1500 vertical. It has a 120 mm stem, sized 55cm bike, stem slammed. I have even "played" with it trying to see if clamping my knees to the top tube or braking (which makes it worse) stop it.
What has mattered a lot is wheel choice. Ksyrium SL wheels: has speed shake, Campy Zonda wheels: none, Hed Jet 6+ - speed shake at 35 MPH awful. I think the fork / front wheel choice is the main issue, the commonality of the Ksyrium SL and the Hed is that they are both big wind dams in the front end.
I am just going to sell it. I have an older titanium / carbon Serotta that is a downhill carving machine, feels steady as a rock and you can rip down any descent at warp speeds.