http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Topic: (not) good vibrations en Sat, 16 May 2026 22:12:50 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176258 Fri, 19 Dec 2014 13:45:24 +0000 Nelly 176258@http://citycyclingedinburgh.info/bbpress/ <p>Oooh, I like that speed wobble theory - unfortunately I was going about 10mph !</p> <p>Wheels are pretty standard mavic 32 spokes, but on reflection it did feel a little like the mudguard judder scenario.</p> <p>Amir, I probably did death grip the bars, but it was all over pretty quickly.</p> <p>Might leave early to see if I can find the computer - not holding out much hope. Cheers </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176235 Fri, 19 Dec 2014 10:18:36 +0000 Ed1 176235@http://citycyclingedinburgh.info/bbpress/ <p><a href="http://en.wikipedia.org/wiki/Mechanical_resonance" rel="nofollow">http://en.wikipedia.org/wiki/Mechanical_resonance</a></p> <p><a href="http://en.wikipedia.org/wiki/Speed_wobble" rel="nofollow">http://en.wikipedia.org/wiki/Speed_wobble</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176233 Fri, 19 Dec 2014 10:08:04 +0000 Darkerside 176233@http://citycyclingedinburgh.info/bbpress/ <p>Mudguard flexing in the gust and rubbing against the studs? If it caught them right at the base of the guard you might get some juddering.</p> <p>Or some bizarre resonance/aerofoil effect (not sure that's a thing...). Aero spokes or front forks? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176232 Fri, 19 Dec 2014 10:05:03 +0000 wingpig 176232@http://citycyclingedinburgh.info/bbpress/ <p>What materials and spoke count?<br /> I sometimes get a low whistle created by some interaction between the mudguard stays/fork/spokes and a strong wind from four or eight o'clock which is enough to start the mudguard resonating with quite a noticeable thrumming, but never the wheel. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176231 Fri, 19 Dec 2014 09:57:09 +0000 amir 176231@http://citycyclingedinburgh.info/bbpress/ <p>Sounds a bit like my big-off. I never fully got to the root cause but suspect it was a pinch-flat and/or buckled wheel caused by a cattle grid. But there was also quite a gusty breeze. Nasty.</p> <p>Did you clamp your hands tightly on the bars after the gust by any chance? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=14129#post-176228 Fri, 19 Dec 2014 09:37:53 +0000 Nelly 176228@http://citycyclingedinburgh.info/bbpress/ <p>Very odd one this morning.</p> <p>Abbotsford Crescent heading for Colinton Road about 6.45, I was hit with a sudden gust of wind - nothing too unusual about that.</p> <p>But my front wheel started vibrating like crazy - it only lsted a couple of seconds, but I am pretty sure I would have been off had it not happened in a straight line.</p> <p>It was so odd, I stopped, checked the bolts, mudguards, even the (studded) tyres. Nothing untoward but very very disconcerting.</p> <p>anyone ever had similar?</p> <p>p.s. Reason its in the Computers/Smartphones section - Got to work and realised I was missing my (old but reliable) speedo - suspect it was there </p>