High speed tyre fail?

[nodrog:Me]

Nasa called

[ducatilover]

Centrifugal force doesn't exist though

[Gremlin]

Sounds like you're on to it.

I did have a tyre once that would deflate when I hit 110-120kph. Reproduced it 3-4 times over 160km (80km down the line, 80km back again to replace). However, it was deflating all the way, going from full pressure to (in one case) 1psi before I got it stopped on the side of the road.

Poor bead on the tyre was blamed, and the replacement tyre (same model) was fine.

[swbarnett]

Centrifugal force doesn't exist though

No, but centripetal force does and without it the valve inner will move as far as it can on a tangent to the rim.

[mossy1200]

No, but centripetal force does and without it the valve inner will move as far as it can on a tangent to the rim.

If this thread turns into a heated discussion including circles with objects leaving in straight lines at angles in relation to rotation speeds and ends up with arguments idd like to point out I only wanted to know why my tire went flat. Lets point out that after that im no longer responsible.

[Kickaha]

Centrifugal force doesn't exist though

Doesn't matter, everyone knows what is meant by the word regardless of whether it is correct or not

[nzspokes]

Well I learned me something.

Thats why at one of my track days I got told off for not having valve caps.

[sidecar bob]

If this thread turns into a heated discussion including circles with objects leaving in straight lines at angles in relation to rotation speeds and ends up with arguments idd like to point out I only wanted to know why my tire went flat. Lets point out that after that im no longer responsible.

This is KB bro.

[Grumph]

This is KB bro.

True...

It's not a new problem, I remember the old man pointing out to Neville Landrebe that he had no valve caps fitted on his TD2 at a flying quarter shortly before Neville was killed. After thinking about it for a minute, Nev hunted out a couple and fitted them...

[sidecar bob]

What is lacking is a downloadable scrutineering form on the MNZ website that can be printed by scrutineers prior to an event. We need one for road race bikes, one for dirt bikes & one for sidecars. That would go a long way to addressing the variance in levels of scrutineering between individuals & create a common standard.

[Reckless]

Common problem on road race karts with the small diameter wheels turning at a huge rate.
We also used to grub screw the rims with a O ring under them to keep the beads on the rim as well.

Good times Mossy

[scumdog]

No, but centripetal force does and without it the valve inner will move as far as it can on a tangent to the rim.

Yep, knew that - but there would have been a shit-load of ????? from some had I used that word!

[Kickaha]

Common problem on road race karts with the small diameter wheels turning at a huge rate.
We also used to grub screw the rims with a O ring under them to keep the beads on the rim as well.

Hence why I didn't ever fit anything but metal valve caps with a rubber seal on my 250 Superkart wheels

[swbarnett]

Yep, knew that - but there would have been a shit-load of ????? from some had I used that word!

Indeed. However, never let the ignorance of others stop you using the correct terminology. It won't hurt them to learn something.

[mossy1200]

Ordered myself some cnc ones with o rings.
Rear wheel wibbly at 300 was not very much fun.
Guess im lucky it wasn't the front.

Might take a some spares next time and see if anyone has some missing.