Sudden tyre deflation but no puncture

nikfubar1 · Sep 15, 2013

Went for a blast today on the Ape & my mate was leading on his CBR1000 got up to silly speeds, then when we slowed down for a roundabout his steering went all weird, pulled over & his tyre had gone down to about 16psi. Limped to the café called the RAC thought he'd got a puncture but when they came out & inflated it there was nothing wrong & he got home without the pressure dropping. This is a new Battlax hypersport S20F which has only been on there a week as the previous identical tyre had done exactly the same thing but had deflated on two occasions & was taken into the bike shop where they said there was a thorn in the tyre (which I don't believe now) & replaced it with this one.

Anyone any ideas as it doesn't inspire confidence

Slackey · Sep 15, 2013

Is the rim of the wheel where the bead sits in good condition?

nikfubar1 · Sep 15, 2013

Yeah the bike is only a couple of years old & he keeps it mint, had a look round the rim when checking for punctures & there's not even so much as a tyre lever mark on them.

Slackey · Sep 15, 2013

It could have a defect on the inside though. When the tyre gets hot the pressure will increase and a small defect may cause the bead to give and release the pressure.

It could also be a faulty valve, the same thing would happen when the tyre gets hot. Was the valve changed when the tyre was?

Tifa1 · Sep 15, 2013

There have been instances reported where the centrifugal force of the wheel actually 'throws' the valve open.
I'm not so sure myself....but I do believe in aliens and ghosts :lol:

redratbike · Sep 15, 2013

Slight nick in the powder coating?

Happened to a mate of mine but he was flat out down Bray hill manxgp on an Sp1 took him till quarter bridge to come to a halt after having the mother of all tank slippers that bent his ohlins steering damper.

Only thing they could find was a tiny little nick in the powder coating everything else looked good.

gregorious77 · Sep 15, 2013

My mate had this on an RGV250 after a flat out sprint (125mph). pumped it back up and it was good as gold forever more.

mikee · Sep 15, 2013

Yup
Blow it up and see what happens
Tire weld or slime might be a good idea

Scoldedcat · Sep 18, 2013

Sticky valve?
Sometimes have it on push bikes which use high pressures

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Sudden tyre deflation but no puncture

nikfubar1

Slackey

nikfubar1

Slackey

Tifa1

redratbike

gregorious77

mikee

Scoldedcat

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