http://citycyclingedinburgh.info/bbpress/ CityCyclingEdinburgh Forum » Tag: speedwobble - Recent Posts en Sat, 27 Jun 2026 11:52:00 +0000 http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13514 Thu, 23 Sep 2010 12:49:03 +0000 ruggtomcat 13514@http://citycyclingedinburgh.info/bbpress/ <p>I dont think it was 20mph tho (no speedo) and have you TRIED going no hands slowly? it really hard!</p> <p>&lt;-- is also a unicyclist :P </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13499 Thu, 23 Sep 2010 10:22:15 +0000 kaputnik 13499@http://citycyclingedinburgh.info/bbpress/ <p><em> I was going pretty fast</em></p> <p>Consider this is your ticking off for riding no handed while going fast :) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13493 Thu, 23 Sep 2010 00:18:22 +0000 ruggtomcat 13493@http://citycyclingedinburgh.info/bbpress/ <p>thought it might have a name, Thanks. :) I was going pretty fast.. gyroscopes, eh?</p> <p>great link btw.</p> <p>although he is wrong about continuously variable transmissions <a href="http://www.youtube.com/watch?v=F6zE__J0YIU" rel="nofollow">http://www.youtube.com/watch?v=F6zE__J0YIU</a> </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13492 Wed, 22 Sep 2010 23:55:29 +0000 Arellcat 13492@http://citycyclingedinburgh.info/bbpress/ <p><em>its like when your in a car and the wheel balance is off, the wheel starts sawing side to side by itself and the oscillations grow.</em></p> <p>It's not uncommon, and it's called shimmy. Your bike frame is a spring, not a completely rigid structure, and certain combinations of mass (you, plus or minus any luggage) and distribution result in specific natural frequencies of vibration. Usually the remedy is to damp the oscillation by standing on the pedals, or laying your leg against the frame, or another change from the excitation position. Both my old Tange Prestige steel-tubed mtb and my True Temper steel SWB recumbent have springy frames that vibrate maddeningly if I ride no-handed with my panniers loaded out back.</p> <p>Check out <a href="http://www.faqs.org/faqs/bicycles-faq/part4/">Part 4, Section 8h.5 of the rec.bicycles.tech FAQ</a> for Jobst Brandt's take on it. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13491 Wed, 22 Sep 2010 23:30:40 +0000 ruggtomcat 13491@http://citycyclingedinburgh.info/bbpress/ <p>thanks for the advice, ima look some more inna morning. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13490 Wed, 22 Sep 2010 23:11:01 +0000 kaputnik 13490@http://citycyclingedinburgh.info/bbpress/ <p>or something blatantly obvious like quick release not done up properly... </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13489 Wed, 22 Sep 2010 22:48:55 +0000 kaputnik 13489@http://citycyclingedinburgh.info/bbpress/ <p>In which case perhaps you were cycling on rumble strip. Or you need to cycle with your hands on the bars :) (or failing that, if it happens again, it's a wee tgrip to the bike hospital) </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13488 Wed, 22 Sep 2010 22:45:26 +0000 ruggtomcat 13488@http://citycyclingedinburgh.info/bbpress/ <p>carbon forks, too dark to check out but i think it would be obvious if it failed. front rim, axle and brakes are true and unencumbered. no loose spokes...</p> <p>its like when your in a car and the wheel balance is off, the wheel starts sawing side to side by itself and the oscillations grow. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13487 Wed, 22 Sep 2010 22:29:46 +0000 kaputnik 13487@http://citycyclingedinburgh.info/bbpress/ <p>front rim true?<br /> any cracks in the fork?<br /> front hub spinning smoothly?<br /> any front spokes loose?<br /> front brake binding?</p> <p>Is it a solid or suspension fork? </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13486 Wed, 22 Sep 2010 22:25:56 +0000 ruggtomcat 13486@http://citycyclingedinburgh.info/bbpress/ <p>the headset is solid, its both wheel and handlebars shaking. Ive never seen this before. I did hit some pretty hard potholes at speed but nothing out of the ordinary, bike is about 6 months old. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13485 Wed, 22 Sep 2010 22:22:44 +0000 kaputnik 13485@http://citycyclingedinburgh.info/bbpress/ <p>A quick and obvious answer is that it's likely to involve the headset, stem, fork or front brake or wheel...</p> <p>was it just the bars shaking? was the wheel wobbling? was there a noise? were they shaking laterally or vertically?</p> <p>A quick test to see if there's a problem with your headset is to stand over the bike, hold the front brake on tight and then give the bars a little push forward. There shouldn't be any "give" in the headset and the whole bike should rotate around the front hub, with the wheel nicely on the ground. </p> http://citycyclingedinburgh.info/bbpress/topic.php?id=1427#post-13484 Wed, 22 Sep 2010 22:11:01 +0000 ruggtomcat 13484@http://citycyclingedinburgh.info/bbpress/ <p>Hey,</p> <p>rather unsettling problem started tonight, as i was cruising down hill near the end of my run i took my hands off the bars to sit up and they started to shake, this quickly and alarmingly built up, but couldnt be felt once my hands were back on the bars.</p> <p>Ive had a good poke round google but cant find anything, maybe im using the wrong term?</p> <p>help pls!! </p>