Tyre pressures - advice sought

**Pixie** · 13th October 2009, 09:52

Originally Posted by p.dath

They also talk about under-inflated tyres heating much more, and if you've read all the threads about racers, you'll know tyres have a limited number of heat cycles.

The limited heat cycle thing mainly applies to race compounds.No manufacturer would market a general road use tyre that deteriorated like this.It's begging for a court action.

The correct pressure for a given rider's style of road riding,is one that achieves a temperature increase of around 3 to 5 degrees from cold.

**MSTRS:Me** · 13th October 2009, 11:20

Originally Posted by Pixie

The correct pressure for a given rider's style of road riding,is one that achieves a temperature increase of around 3 to 5 degrees from cold.

No way. Be much more than that. At least on the surface of the tyre.

**vifferman** · 13th October 2009, 11:30

Originally Posted by Pixie

The correct pressure for a given rider's style of road riding,is one that achieves a temperature increase of around 3 to 5 degrees from cold.

Isn't that supposed to be "a pressure increase of around 3 to 5 % from cold"?

**MSTRS:Me** · 13th October 2009, 11:54

Originally Posted by vifferman

Isn't that supposed to be "a pressure increase of around 3 to 5 % from cold"?

Still not right. If he means %, it should be around 10%. Anymore, and you are probably running too soft from cold. And vice versa.

**vifferman** · 13th October 2009, 12:07

Originally Posted by MSTRS

Still not right. If he means %, it should be around 10%. Anymore, and you are probably running too soft from cold. And vice versa.

Yeah, that's what I said - around 10%.

**grusomhat** · 13th October 2009, 13:49

So if I run my tires at 41R/36F, what would be an acceptable pressure hot?

**MSTRS:Me** · 13th October 2009, 14:05

+4psi and +3.6psi
Personally, on your bike I'd start at 35f 38r

**grusomhat** · 13th October 2009, 14:09

Originally Posted by MSTRS

+4psi and +3.6psi
Personally, on your bike I'd start at 35f 38r

Sweet, that seems about how much they were up the other day. I need to find a guage though that I can trust. Might just buy a new pencil gauge. I'll give those pressures a run next time.

**v8s&2wheels** · 13th October 2009, 15:37

Originally Posted by grusomhat

Sweet, that seems about how much they were up the other day. I need to find a guage though that I can trust. Might just buy a new pencil gauge. I'll give those pressures a run next time.

Ha snap. Both still trying to get our pressures right ae. If you want you can borrow my gauge for a week or 2 until you get one. Im going to use it 2mrw and that should be me for a couple of weeks. let me know if you want it

**Pixie** · 14th October 2009, 08:12

Originally Posted by MSTRS

No way. Be much more than that. At least on the surface of the tyre.

Sorry,I must have suffered brain fade.
I meant to write: a pressure increase of 3 to 5 psi.

**MSTRS:Me** · 14th October 2009, 08:49

You're forgiven. But don't do it again, you hear?
Actually, +5psi is a bit much. Might be acceptable on the track, when that extra heat = extra stick, but un-necessary on the road and will seriously shorten tyre life.

**vifferman** · 14th October 2009, 09:00

Originally Posted by Pixie

Sorry,I must have suffered brain fade.
I meant to write: a pressure increase of 3 to 5 psi.

That's what I said.
3 to 5 pissies.
Innit.

**KEN** · 17th October 2009, 19:53

Check ya tyres B4 each big ride to what the manufactors specs on the frame,end of story....

**StoneY** · 17th October 2009, 20:36

Got me a Tyre Gauge at a mates advice

Test them cold

Got em on 38r and 36f and man that bike is sweeeeeet

Oh man Tyre pressure is so fuckin important wow has this been an eye opener

I used to just leave it to the guys in teh shop....and they had me 46-42

Never again

**grusomhat** · 18th October 2009, 02:43

Originally Posted by StoneY

Got me a Tyre Gauge at a mates advice

Test them cold

Got em on 38r and 36f and man that bike is sweeeeeet

Oh man Tyre pressure is so fuckin important wow has this been an eye opener

I used to just leave it to the guys in teh shop....and they had me 46-42

Never again

Wow that is high! you would be looking at almost 50 in the rear when hot!