Joined Sep 2007
2K Posts | 0+
UK,northamptonshire.
Joined Aug 2007
2K Posts | 0+
Northamptonshire
I dont think it happens to all tyre valves,If it did there would be a problem,It was obviously a dodgy valve as i had only had the new tyres fitted a week before so they must have fitted a crap valve and as for the theory,what if there was a weak spring fitted inside the valve as it is only this that forces the needle out the pure speed of the wheel going round will force the needle towards the tyre if it was weak.
No raw nerve hit just the fact that we might have a laugh now and then but certainly dont talk BS well I hope not anyway.:thumbup
Joined Aug 2007
2K Posts | 0+
Northamptonshire
Thanks for the support LEGS and just to add one more thing is the fact that your right about the dust caps Forza did say that the caps that were fitted might not have helped and since that time I have been out and bought valve caps with the sealing O rings in.
This thread and resultant information raises a serious issue really. Sharky supposes he had a dodgy valve fitted and maybe others may have had too. If it is also right that the metal dust caps with their O rings are OK does that mean it's only the dust cap seal holding the air in at high speed? Now I'm taking notice!
I myself have caps that indicate if there is a pressure loss and they have a very good seal so I've never experienced any problems. Maybe this is one I'll get referred to tyre manufacturers. If I get any feedback I'll post it.
I myself have caps that indicate if there is a pressure loss and they have a very good seal so I've never experienced any problems. Maybe this is one I'll get referred to tyre manufacturers. If I get any feedback I'll post it.
BoB, i think the air pressure release at high speed is only gradual, but over a sustained long distance then yes it could become a factor as was the case for NewBoots and Sharky. Again, it would be difficult to ascertain the amount of affected valves. Tyre pressures are critcal on high performance bikes and as Badger says, the tyre pressures should be checked weekly. How many of us actually do it though? I for one don't but i certainly check them every month, especially if the bike's been stood for a while. Over the winter my rear tyre lost 6psi. This can't be through the valve as the o ring on my dust cap seals the valve from escaping air and i certainly have not got a puncture.
It's probably isolated cases of faulty valves but for a safety precaution as Badger has said fit the o ringed dust caps or insist on 90 degree valves or both.
It's probably isolated cases of faulty valves but for a safety precaution as Badger has said fit the o ringed dust caps or insist on 90 degree valves or both.
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Joined Aug 2007
2K Posts | 0+
Northamptonshire
The question is BoB do you actually go fast enough :dougfor this problem to affect the tyre valves on your bike:exclamation
Guys this is not a new problem that affects just Aprilias, this has been common for as long as i care to remember
h
h
Joined Aug 2007
1K Posts | 0+
Brent Knoll, Somerset
Joined Jul 2007
2K Posts | 0+
Northamptonshire, England
Guys this is not a new problem that affects just Aprilias, this has been common for as long as i care to remember
Appreciate the info Badger....but this is the first experience I've had of such a rapid deflation!:dowhat
Don't really know Sharky. I was doing 172mph earlier today and jumped straight off to check my pressures. Thank goodness they were OK.
Joined Aug 2007
2K Posts | 0+
Northamptonshire
God that was a brave thing to do,BoB you could easily have pulled a hamstring hanging off the bike like that or groin strain as some people call it
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Joined Oct 2010
4K Posts | 0+
Pontefract
I recently had new tyres fitted and I'm experiencing a gradual pressure loss on the front tyre. I check pressures before every ride and since the new ones I have to pump up the front a couple of psi every time, would fitting a good sealed cap cure this :dunno they have cheapo plastic ones on at the moment that I pinched off the wifes mountain bike :roll
Joined Oct 2010
4K Posts | 0+
Pontefract
Took two one night i was pissed and was walking round next day with a whole three and a quarter inches bursting out of my pants
irate