ark Posted November 10, 2011 Posted November 10, 2011 So yesterday on my ride (MTB) whilst going downhill on tar road at about 30km/h i let go of my bars like i usually do to chill a bit, and the next minute i get this serious speed wobble !! So i grab on again and try again and the same thing happens, again & again.This has never happened before. Any one out there know what could be causing this ?
ark Posted November 10, 2011 Author Posted November 10, 2011 Yip. Checked headset, hubs, spokes. ?????????
ark Posted November 10, 2011 Author Posted November 10, 2011 Someone told me could be the sealant but this was well into my ride so surely it was all spread out ?
ark Posted November 10, 2011 Author Posted November 10, 2011 Not maybe ET sitting on your bars?heh heh heh heh heh heh heh heh heh heh heh hehGood one but no, he went home already. Old photo.
Pieterg Posted November 10, 2011 Posted November 10, 2011 Stiffness of your frame.Old or new frame.If a frame is getting old stiffness is lost
andretraut Posted November 10, 2011 Posted November 10, 2011 Stiffness of your frame.Old or new frame.If a frame is getting old stiffness is lostReminds me of something a heard from Dr Ruth, but instead of frames, she spoke about men!
Pieterg Posted November 10, 2011 Posted November 10, 2011 That's why we got better. Bigger and more expensive bikes then the other guy .Let me think
Robin Wicomb Posted November 10, 2011 Posted November 10, 2011 correct me if i'm wrong, but does the fact that he took away the direct force upon the handle bar contribute to the wobble? I've always thought a speed wobble occurs when there isn't enough weight on the front wheel which makes the bike unstable. (usually happens to me when going over 80/90km.h tho. I'm fairly light weight)
Johan Bornman Posted November 10, 2011 Posted November 10, 2011 Stiffness of your frame.Old or new frame.If a frame is getting old stiffness is lost Nonense.
kamikaze Posted November 10, 2011 Posted November 10, 2011 must be the headset, check it again. or what about water in the rim, did you ride through any rivers recently?
Niner Posted November 10, 2011 Posted November 10, 2011 I have had this when a tire was not seated straight....so it was actually the tire causing the wobble....
The_Break Posted November 10, 2011 Posted November 10, 2011 Did you change anything on the bike recently? Was there a side wind?Is your wheel seated properly in the dropouts, check both front and rear?
Johan Bornman Posted November 10, 2011 Posted November 10, 2011 Did you change anything on the bike recently? Was there a side wind?Is your wheel seated properly in the dropouts, check both front and rear? Here we go again.... We've been through this and your last theory was friction - static, I think, that caused the wheelbase to shorten.  https://community.bikehub.co.za/topic/13403-speed-wobble/page__hl__harmonic__st__20  How do you foresee a sidewind inducing a speed wobble?
ark Posted November 10, 2011 Author Posted November 10, 2011 Thanks for all your input guys.Will go through the bike thouroghly again.It's a dual sus so stiffness is not an issue.I'm just concerned because it has never happened before and i'm always riding "no hands"
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