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Random tyre deflation

V

verdomde

Joined Apr 2015
136 Posts | 4+
United Kingdom
2004/5 Tuono fighter

Hallo,

A while back my front tyre let itself down, I had been going quite fast, there was nothing in the tyre, and it was fine after I re-inflated. Thought not much more about it. Last week, newish front tyre did the same thing, although this time I had arrived home and left it in the garage overnight- again, I had been going quite fast.

Anyone experienced similar phenomena?
Ta
 
Has the valve been replaced,I have been told the centrifugal force at speed can open the valve,use metal dust caps with a rubber washer type seal in them and that will prove one way or the other :dunno
 
Cool, figured might be a valve thing, don't know anything about replacing them, will look for the dust-caps. Great info thanks.
 
Awesome, never knew such things existed, inflating would be so much easier, will grab some at next tyre change.
 
Blade said:
Has the valve been replaced,I have been told the centrifugal force at speed can open the valve,use metal dust caps with a rubber washer type seal in them and that will prove one way or the other :dunno
Click to expand...

Yup, had exactly same happen on rear tyre when checking out what 6th gear was for! :thumbup
Turned out valve spring was shot. Replace internal valve/spring (5p!) unit and use quality metal dust cap with good internal rubber seal (lots of eBay rubbish out there with 'o' rings that fall out when cap removed!!), and job done! 90 degree adapter also good for access though.
 
This seems to be one of the areas that Aprilia cut corners surprisingly. The metal valves securing nuts tighten directly onto the wheels without a safety compression washer or seal. As there seems to be little to stop the valves becoming loose through vibration or simply jarring from less than perfect road surfaces, this is unforgivable.
 
Forgot to add that in 25k miles I've never had pressure loss through faulty tyre valve washers,,,,,,,,,,wellat least enough for me to notice when riding.

But I'm nae track god wae an ultra sensitive arse who'd notice a couple of missin psi.
 
StandrewsX said:
This seems to be one of the areas that Aprilia cut corners surprisingly. The metal valves securing nuts tighten directly onto the wheels without a safety compression washer or seal. As there seems to be little to stop the valves becoming loose through vibration or simply jarring from less than perfect road surfaces, this is unforgivable.
Click to expand...
Never heard of that before.Do you have experience of valves coming loose?
 
Ric Flair said:
I had just opened a new thread about my mates 90° valves and here I find you've already answered it!

Good one Keith, always 2 steps ahead :)
Click to expand...
:thumbup

Yeah,as in the other thread,I had some fitted during a tyre change.
Had the front tyre deflate twice.The first time was braking into a roundabout on a duel carriageway.Doing about 100 at the time.(thats kph,officer...:crazy )
F'kin scary,I tell thee.
Second time was on the bumpy fen road that leads into our village,...braking for the 30.
Not had a problem since the 90 degree valves were fitted.

Plus it makes it easier to blow yer tyres up.:yes
 
My back tyre loses about 4-5 psi a week, had a new valve fitted when the tyres were changed but still doing it.
 
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