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drsqueelgood

Joined:

Apr 05

Posts: 303

drsqueelgood says:

Shrader valve

Went out early yesterday for a nice little run out and this happened. Had to nurse the bike home and push it some. ZX6r with a flat front tyre. Not good fun!!! :wacko: Apologies for poor photo quality. 

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  • Posted 2 years ago (06 May 2013 14:14)

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James600zx

Joined:

Sep 07

Posts: 2765

James600zx says:

Valve.

My R1 did this too but luckily I noticed it when pumping the tyres up before leaving home. I thought it was due to the relatively heavy aftermarket, anodised valve caps which the previous owner had fitted. Have you got similar valve caps?

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drsqueelgood

Joined:

Apr 05

Posts: 303

drsqueelgood says:

James

I do have a heavy cap fitted. It's one of those pressure indicator caps to warn you if the pressure drops too low. Sounds a bit of a coincidence don't it.? :wacko:

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tim8061

Joined:

Apr 10

Posts: 114

tim8061 says:

Cetrifugal force

Doubt metal/heavy caps are the problem - those 90 degree extensions weigh a lot more and would exert a much bigger bending force. Faulty manufacture or install is more probable. Funnily enough I had a new front on a week ago, and today I had it go down to 12psi due to a leaky valve. Never had that happen in 30yrs+ - the amazing thing was the handling felt fine and I only found out on the post-ride clean and check.



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James600zx

Joined:

Sep 07

Posts: 2765

James600zx says:

Tim,

The difference with the 90 degree valves is that they sit close to the rim and and are more substantial low down. (See pic link)  I do think centrifugal force can cause damage when you've got a non-standard cap on top of the usual 2cm length of rubber. You're right about faulty installation though. A bit of both, perhaps.

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old(ish)git

Joined:

Apr 08

Posts: 9531

old(ish)git says:

do you...

use an heavy chain through your wheel when securing it? You may have inadvertently caught it with the chain. I can thoroughly recommend these when you have tyres fitted. metal flush to rim,very light and should only need replacing every fourth tyre change. They should be around 5 quid apiece.

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drsqueelgood

Joined:

Apr 05

Posts: 303

drsqueelgood says:

Oldish

I lke the look of those:smile. I do lock it up with a chain in the garage but through the back wheel to my other bike.

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