Too slow going down hills

341 to 350 of 350 messages
24/09/2014 at 12:42

Not really sure what you mean by oscillating/swerving - a speed wobble would be more dramatic than that usually and affect the bike not just the rear wheel and normally at speed cross winds etc affect the front end of the bike not the rear.    Soft tyres might cause that feeling but so long as you have 70psi plus in I can't see it.  

24/09/2014 at 12:44

Cross post - if you are routinely sticking in 100plus psi that's high end of normal for 25mm - especially if they are a make that run big - eg Michelin pro4s at 25mm measure 27Mm.    

24/09/2014 at 13:01

I just checked and they're actually 28 (!) 700c's, Continental Contacts. Says max 102psi on the side!

24/09/2014 at 13:23

as pops says, a speed wobble aka "tank slapper" usually affects the whole bike and rider and not just the rear wheel.

is your rear QR done up tight enough?? if it's slightly undertight then speed may pick this up creating a slight wobble.   could also be that wheel is slightly out of true which would again probably be only noticeable under high revs.

24/09/2014 at 13:27

What's a QR?

cougie    pirate
24/09/2014 at 13:31
Quick Release..

I've only ever had a speed wobble on the bike once - descending off Saddleworth Moor on a new compact bike and with a fierce side wind - I couldn't keep the bike in the right lane even - very scary.
24/09/2014 at 13:33

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Edited: 24/09/2014 at 13:34
24/09/2014 at 13:35

No, this isn't speed wobble. I know what that is. I can just feel the tyre snaking around on the road. It's unnerving. Do you hear of any catastrophic equipment failures?

cougie    pirate
24/09/2014 at 13:42
Well occasionally - but its quite rare. I do think 120 PSI in a 28mm tyre is massively overdoing it. I have 25mm on and with about 80-90 PSI in the rear.

Could it be that you're overinflating it and its slightly out of round ?
24/09/2014 at 16:50

Possibly. I'm going to check all of the above and let some air out of my tyres. I'll let you know if it makes a difference.


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