scary speed wobbles (Boardman 2010)
first post here
I did post on the roadcc FB page and had some replies but I'm keen to know more..
I bought my Boardman road bike in early 2010 (the £999 carbon bike) after not riding since I was a kid - I enjoyed riding it and seemed to go down hills without any issues except getting used to it etc as the more experienced guys (in the tri club I'd recently joined) flew down
I did triathlon in 2010 and entered my first Ironman in 2011 - so I bought some 2nd hand HED wheels (90mm bad boys front and back) - it was around March 2011 I had my first bib short filler of a speed wobble - I never knew what it was at the time but it shook me up BIG time.. descending about 25-30mph with some cross winds and suddenly the bike went nuts and started shaking violently.. need less to say I grabbed the brakes and almost shat myself.. I kept the front HED 90mm for non windy and short rides only and then bought a 60mm HED front for my Ironman in Germany
I asked a few bike experts who tightened the headset and that was that.. about 3-4 months later (with the HED 60mm - again, 2nd hand off ebay) I had the same scary wobble descending a 10% hill (chain hill near Wantage in Oxfordshire) with blustery cross winds - again this had me in a real panic.. I descended very carefully from that point on and never quickly in cross winds - I can descend at speed fine with no cross winds as shown at my ironman in Henley in 2011 and also a cycling trip in Portugal last year..
but then I have had 2 wobbles in the last 8 weeks - using the original Ritchey wheels and my 7-8 year old Mavic Cosmic wheels (52mm).. Chain Hill again for the Ritchey's and a descent of around 5% last week in North Yorkshire..
any ideas? I've tried to look it up.. dodgy forks? wheels? I've never had it happen with my zipp 404 front but maybe that's just a co-incidence with the races/sportives and the weather?
I now always descend with my knees on the top tube and try and relax during the descent - I feel too nervous about riding on the drops in case of the wobble and so I ride on the hoods normally