First time trial outing for the new 631-framed road bike yesterday morning. Acquitted itself well (7th place out of a field of 23) apart from nasty downhill speed wobble at the start of the race (at just below 30mph) which I just about managed to keep in check. Thing is, I've done loads of training miles on it including fast (~35mph) descents and never had this bother before; bike is normally a really stable "armchair" ride. Any suggestions? Culprits at present (or indeed permutations of all 3) are looking like;
1) Less than brilliant road surface
2) Never ridden the bike with tri-bars bolted on the front end before
3) Tyre pressure too high - 130psi in the front (it's a Vredestein Fortezza clincher so still well below the 170 max), 115 in the back (Michelin Krylion Carbon so right on the upper limit for this tyre)
Follow-ups and advice always welcome. Thanks in advance.
David
1) Less than brilliant road surface
2) Never ridden the bike with tri-bars bolted on the front end before
3) Tyre pressure too high - 130psi in the front (it's a Vredestein Fortezza clincher so still well below the 170 max), 115 in the back (Michelin Krylion Carbon so right on the upper limit for this tyre)
Follow-ups and advice always welcome. Thanks in advance.
David