Jay_B Posted February 10, 2015 Author Posted February 10, 2015 Don't want to sound funny but have you ridden another bike to see if its you or the bike? There is a guy in my club that its common knowledge to stay FAR away from him, especially on downhills. The dude cant ride in a straight line and it gets worse on faster decents . He is a bit of a novice but still what iv seen happen to him on the downhills sounds similar to your problem. He just needs to learn to relax a bit and get used to bunch riding. You know the guys that always seem to be involved in the accidents. Yup I have owned more than one bike and never had this problem on the previous bike or this bike until now. I have no problems on descents and actually find i can work them to my advantage as I can handle myself really well... well until now anyway It sounds like a shimmy. Plenty info if you google "shimmy " or "high speed shimmy" can be caused by anything on the bike - including rider tension or shivering. History is important - like are you new to the bike or have you changed anything? - wheels, tires etc. To check frame alignment is fairly simple. Take the wheels off and then wrap the bike in string sort of mirror imaging the path of the string on both sides of the frame eg through dropouts - around head tube and back and so on. With a ruler measure the distance of the frame to the string on each side at the same place. You will soon see if it is the frame. Thanks for the info on the word "shimmy" been doing a lot of reading on that and seems to fit the profile, only thing is a lot of articles refer to it happening as a result of the front wheel and not the back... but it has given me an idea with regards to rider weight distribution, the day before Berg en Dale I tilted my seat a slight bit forward as I was struggling with a really sore and stiff back. I read an article somewhere that suggested this for helping with lower back pain and its been since then that I have had the handling problems. I find it hard to believe that maybe a degree difference in my seat positioning could be the culprit but I will definitely set it back to where it was and see what happens tonight.
Long Wheel Base Posted February 10, 2015 Posted February 10, 2015 Yup I have owned more than one bike and never had this problem on the previous bike or this bike until now. I have no problems on descents and actually find i can work them to my advantage as I can handle myself really well... well until now anywayCool Man. I hope you come right . Keep us posted when you find the problem.
Jay_B Posted February 10, 2015 Author Posted February 10, 2015 So I went out again tonight, readjusted my saddle position and no difference... I then went back up the hill and down again and tried every theory of clamping my knees on the top tube and stood up and clamped the saddle but no luck. Came home and got a piece of string and tied it up and measured the distance on either side of the seat post as described in a lot of blogs... found between a 5mm and 10mm difference which to me shows that my rear triangle is bent, have no idea how this has happened but it is what it is... Atleast I found the problem though
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