Tyre pressures

Billy said:

I love a hard tyre as it gives excellent roll and speed, but also it gives
you a rough ride.
Anyhow, my tyres say max is 120, but some of my friends run theirs at 140
they say.

My 2c - presuusre is only a minor consideration.

In the first sense, safety is relative. If you've only ever run a tyre
over clean hot mix, then old age is your greatest danger, but if you
regularly ride over glass slivers then a cut could set it off at
anytime. Watch for a sudden bumpy ride as groups of fibres are cut then
the tyre starts to bulge in spots.

A skinny road tyre doesn't have a lot of volume to blow off, but a 2.25"
fatties at 140psi has a lot of air to flip/turn/push the wheel sideways.
Of course you might be fast enough to react and nothing might happen
straight away.

To me, the real problem with fatties is when they are dead flat, they
just roll anyways and you have absolutely no directional control. I
could never walk my mtb home with a flat tyre as I would be exhausted
trying to keep it up.

Keep em fresh, watch for crazing/cracking in the tyre and watch for
sudden bumps the bumbs and you should be okay.

The one blowout I ever had was from being skint student and using free
old tyres.

Terry Collins said:

Billy said:

I love a hard tyre as it gives excellent roll and speed, but also

it gives

Quoted message said:

Quoted message said:

you a rough ride.
Anyhow, my tyres say max is 120, but some of my friends run theirs

at 140

Quoted message said:

Quoted message said:

they say.

My 2c - presuusre is only a minor consideration.

In the first sense, safety is relative. If you've only ever run a

tyre

Quoted message said:

over clean hot mix, then old age is your greatest danger, but if you
regularly ride over glass slivers then a cut could set it off at
anytime. Watch for a sudden bumpy ride as groups of fibres are cut

then

Quoted message said:

the tyre starts to bulge in spots.

A skinny road tyre doesn't have a lot of volume to blow off, but a

2.25"

Quoted message said:

fatties at 140psi has a lot of air to flip/turn/push the wheel

sideways.

Quoted message said:

Of course you might be fast enough to react and nothing might happen
straight away.

To me, the real problem with fatties is when they are dead flat, they
just roll anyways and you have absolutely no directional control. I
could never walk my mtb home with a flat tyre as I would be exhausted
trying to keep it up.

Keep em fresh, watch for crazing/cracking in the tyre and watch for
sudden bumps the bumbs and you should be okay.

The one blowout I ever had was from being skint student and using

free

Quoted message said:

old tyres.

http://groups-beta.google.com/group/altb­loodmwtkae

Billy said:

Anyhow, my tyres say max is 120, but some of my friends run theirs at

140

Quoted message said:

they say.

I used to run my clinchers @ +120, till I started getting more B.outs.
Now I run 100. Reason; The last thing I want is a B.out @ 80km/h, I
don't think it would be much fun. If you haven't seen Joseba Beloki's
exit from the 2003 Le Tour, you may change your mind about uping the
risks of having a B.out🙂

http://www.nos.nl/archief/specials/tour2003/afbeeldingen_redactie/195/etappe_09/et_09_val_beloki.jpg

http://2003.tour-de-france.cz/images/foto/14-07-2003/belfallhurt.jpg

http://www.usplaesperanza.com/archivos/42-89-Imagen/Tratamiento_Beloki.jpg

Jay Woo said:

I used to run my clinchers @ +120, till I started getting more B.outs.
Now I run 100. Reason; The last thing I want is a B.out @ 80km/h, I
don't think it would be much fun. If you haven't seen Joseba Beloki's
exit from the 2003 Le Tour, you may change your mind about uping the
risks of having a B.out🙂

http://www.nos.nl/archief/specials/tour2003/afbeeldingen_redactie/195/etappe_09/et_09_val_beloki.jpg
http://2003.tour-de-france.cz/images/foto/14-07-2003/belfallhurt.jpg
http://www.usplaesperanza.com/archivos/42-89-Imagen/Tratamiento_Beloki.jpg

Beloki crashed because he locked up his brakes and rolled the tyre off
the rim though. I don't know if it was pressure-related as such, he was
simply going too fast for the corner and probably would've rolled his
tyre at a lower pressure anyway. AFAIK not that many of us run singles
on the road.

http://www.truerwords.net/3260
http://www.velonews.com/tour2003/news/articles/4537.0.html

hippy

Quoted message said:

Beloki crashed because he locked up his brakes and rolled the tyre

off

Quoted message said:

the rim though. I don't know if it was pressure-related as such, he

was

Quoted message said:

simply going too fast for the corner and probably would've rolled his

Quoted message said:

tyre at a lower pressure anyway. AFAIK not that many of us run

singles

Quoted message said:

on the road.

http://www.truerwords.net/3260
http://www.velonews.com/tour2003/news/articles/4537.0.html

hippy

Cool, end result will be much the same though, lots-a pain.

Quoted message said:

Beloki crashed because he locked up his brakes and rolled the tyre

off

Quoted message said:

the rim though. I don't know if it was pressure-related as such, he

was

Quoted message said:

simply going too fast for the corner and probably would've rolled his

Quoted message said:

tyre at a lower pressure anyway. AFAIK not that many of us run

singles

Quoted message said:

on the road.

http://www.truerwords.net/3260
http://www.velonews.com/tour2003/news/articles/4537.0.html

hippy

Cool, thx for the correction. I know the times I've had a B.out, the
tyre has rolled off the rim every bloody quickly, so the end result, at
speed, will be the same I think - lots-a pain.

Billy said:

I love a hard tyre as it gives excellent roll and speed, but also it gives
you a rough ride.
Anyhow, my tyres say max is 120, but some of my friends run theirs at 140
they say.
At what point will the tube blow, is it safe to get 140 without it blowing ?

I know my mountain bike, if I go to much it blows.
Is it the same with Road tyres ?

Or are they much harder to blow ?

Thanks again, sorry if this might sound like a silly question.

120 I go on the 110 I have is the max I have gone, but I reckon I could get away with more, Im just a wuse-bucket, some really great tri***lon stories particularly in warmer climates are people really cranking up the air pressure, above the max, they do their swim, get back to their bike to have had one of the tyres blow off, with the heat it was just too much... so guess it depends on the climate as well....

Jay Woo said:

Cool, thx for the correction. I know the times I've had a B.out, the
tyre has rolled off the rim every bloody quickly, so the end result, at
speed, will be the same I think - lots-a pain.

Road bike or mtb?

I've had tyres and tubes let go on both without much of an issue so far.
The tyre has only rolled off after I've slowed down.

hippy

hippy said:

Road bike or mtb?

Road

hippy said:

Road bike or mtb?

Both; Twice on my roadie while I was running Conti GP3000's on Mavic
Ksyrium's. And once on my MTB (If you call it that) which I was running
Hutchinson's 1 inch Top Slicks on Mavic cross land's. On all 3
occasions I was running at leased 10~15 psi over the spec'ed pressure
of the tyre.

MikeyOz said:

120 I go on the 110 I have is the max I have gone, but I reckon I could get away with more, Im just a wuse-bucket, some really great tri***lon stories particularly in warmer climates are people really cranking up the air pressure, above the max, they do their swim, get back to their bike to have had one of the tyres blow off, with the heat it was just too much... so guess it depends on the climate as well....

It's not just the heat though - go to any major tri and listen carefully for popping tyres at regular intervals as people try to get that last psi into their tyres.

My rather boring approach is to pump up to the recommended pressure. I don't require it to be exact, so if it's a few pounds over, I don't worry about it. The main risk (for me) is to drop too many pounds under.

Ritch