Speed Wobbles
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Speed Wobbles
Postby James Quinton » Wed Oct 22, 2008 6:58 pm
Anyone ever get speed wobbles? Any suggestions on fixing it other than changing body position. (Ive changed position more times than an 'X'y with a budget.)
It happens when I go over 60km/h.
I've heard its common on all bikes over a certain speed. That right?
Thanks
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Postby sogood » Wed Oct 22, 2008 7:20 pm
RK wrote:And that is Wikipedia - I can write my own definition.
- Kalgrm
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Postby Kalgrm » Wed Oct 22, 2008 11:33 pm
Cheers,
Graeme
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Postby CB » Thu Oct 23, 2008 12:08 am
this puts you more in control of the bike, and gives you a bit more confidence at high speeds.
combine that with a fairly relaxed grip on the bars and you'll be fine
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Postby Mulger bill » Thu Oct 23, 2008 2:04 am
Shaun
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Postby uncle arthur » Thu Oct 23, 2008 9:55 am
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Postby winona_rider » Thu Oct 23, 2008 10:07 am
i find that i get death wobbles if my tyres get under 60psi
(tyre not beading with rim properly)
but i don't know much about stuff...
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Postby fatherofmany » Thu Oct 23, 2008 12:18 pm
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Postby beauyboy » Thu Oct 23, 2008 5:56 pm
Back in 1994 a girl died when the front wheel of her BMX failed under her at speed. They said the reason for the wheel failure was due the Bike developing speed wobbles, all bmx bikes of a certain brand were recalled.
I remember this Cos I was 9 and had a BMX.
Donald
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Postby RideLikeTheWind » Thu Oct 23, 2008 6:34 pm
I have hit 90+ with no wobbles. It does bother me though the damage that I would do when (if) i came off. I have come off before at 60km/hr and that was bad enough - took some major skin off legs, hands, arms and a huge gouge out of my side. But 90 will hurt, if there is anything left to hurt.
Joe
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Postby lukas » Thu Oct 23, 2008 6:58 pm
OuuuchhJoe wrote:I have come off before at 60km/hr and that was bad enough
Joe
I've never had the speed wobbles.. I only learned about them by reading online. I try and stay as relaxed as possible on descents now though.
Fastest I've been is 75kph... plenty fast for me.
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Postby James Quinton » Thu Oct 23, 2008 11:06 pm
I just went to the bike shop and had the front wheel trued a bit.
Will go down and try to reach 70km - the speed I'd be happy with - and report back. Hopefully they'll have the net in hospital.
One question though: how do you decelerate without braking when you're going down hill?
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Postby toolonglegs » Thu Oct 23, 2008 11:15 pm
James Quinton wrote: One question though: how do you decelerate without braking when you're going down hill?
...the painful way.When you get a tank slapper on a motorbike the best way to get out of it is too accelerate hard...so better pedal faster!.
Never had a bike get a speed wobble...hope the shop didn't tell you that!.
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Postby Mulger bill » Fri Oct 24, 2008 12:31 am
Sit or stand up, make a big 'chute of your body.
Shaun
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Postby toolonglegs » Fri Oct 24, 2008 3:55 pm
...or too tight.senator52 wrote:+1 First thing I thought was check your headset is not loose.sogood wrote:Have you checked if your headset bearing and other major bearings are in good order?
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Postby il padrone » Fri Oct 24, 2008 7:33 pm
Any half decent road bike should track quite straight, given half a chance. The caster on the steering geometry will ensure this.
"An unjustified and unethical imposition on a healthy activity."
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Postby il padrone » Fri Oct 24, 2008 7:36 pm
Stop pedalling and sit up straighter - air brakingJames Quinton wrote:One question though: how do you decelerate without braking when you're going down hill?
"An unjustified and unethical imposition on a healthy activity."
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Postby muggah » Fri Oct 24, 2008 7:50 pm
I had something similar happen to me the other week, I hit 70 and it started to buck, at which point I was glad my knicks weren't white!! . I'm putting it down to the fact that I was rooted from the climb up the hill and was too lazy to shift my bum back on the saddle for the descent. I hope it dosen't happen again though cos it scared the **** outta me!!!il padrone wrote:Were you pressing on your bars a bit? Weight on the front end above the headset will generally precipitate a speed wobble. It began to happen to me on a local descent when I got to about 55kmh. I was mildy concerned about what was going on. Later on another descent I got into my standard descending stance (which I had been slack about earlier) - weight towards the rear of the saddle, cranks level, knees clamped on the top tube and arms relaxed with no weight on them. All of a sudden 65kmh+ was quite comfortable.
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Postby 318ute » Fri Oct 24, 2008 7:53 pm
How fast is too fast (road legal of course) and what should I consider a maximum speed for a Trek 3900 mtb.
I have skinny road tyres and so far have topped out (before squeezing the brakes lightly) at 71kph! No Wobbles
Do bikes come with a manufacturer top speed??
Steve.
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Postby il padrone » Fri Oct 24, 2008 8:07 pm
The day I did 69kmh on a fire-trail near Healesville on my rigid MTB, some of the guys on DH bikes with suspension had done 89kmh!! On a steep, rocky track with off camber corners - going a full 20kmh faster than I did. Yikes
"An unjustified and unethical imposition on a healthy activity."
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