Yeah, haven’t had this in years!
So basically I’ve finished a new SL6 Tarmac and it’s kitted with Mavic Cosmic Pro UST (think that’s the name, 40mm depth maybe) and I’ve moved to a quiet area good for riding while I can WFH.
Haven’t beed riding for 11 months or so, which makes this situation even more frightening.
One countryside loop has a mental downhill, which is dead fun, road is a bit rough, and you usually get a bit of a crosswind too (but not always) and once I hit 40, you get a terrifying speed wobble.
Been about 5 years since I had that happen on a bike. At first I thought, oh it’s the rims, some weird deflection feel that I’d get used to. It’s not that, it’s a proper speed wobble, and the knee dampening trick actually works too. Rare that a home remedy actually fixes anything I find, but there you go.
Anyway, I’ve been testing it over and over for weeks now, and it’s always the same. Over 40mph on that and the wobble kicks in.
This is a stiff frame, so supposedly it shouldn’t be happening. Wheel looks true at that too, it’s new as well so unlikely to be damaged in some way.
Played with thru-axle tightness as well which hasn’t helped. This is an issue which is persistent, so at least that’s good, means it can be fixed by trial and error. Any ideas on what to do. I’m thinking the front wheel getting switched out might do it (no other wheel to do that with though).
Disc brake? Not entered right, would that do it?