correct tyre pressure for 25c

[bladesman73]

Moved from 23's to 25's with campy zonda wheels. I weigh around 200lbs. Normally puy 115psi in rear tyre and 100psi in front. Does anyone think I could go lower in either tyre without compromising rolling resistance?

 

[lpretro1]

What's the min pressure indicated on tyre sidewall? And what tyres. I run Conti GP4000S II at 90/80 without any problems - still roll, very well and way more comfortable

 

[User6179]

I put about 105 in the rear and 95 in the front of my 25s and weigh about 220lbs .

 

[bladesman73]

May go lower psi then!

 

[Drago]

I'm a lot heavier than your featherweight frame and run in the region of 110-115.

 

[Scotchlovingcylist]

I weigh around 250lb and run about 115

 

[Citius]

Moved from 23's to 25's with campy zonda wheels. I weigh around 200lbs. Normally puy 115psi in rear tyre and 100psi in front. Does anyone think I could go lower in either tyre without compromising rolling resistance?

You won't compromise rolling resistance by running lower pressures. Quite the opposite in fact.

 

[ColinJ]

Moved from 23's to 25's with campy zonda wheels. I weigh around 200lbs. Normally puy 115psi in rear tyre and 100psi in front. Does anyone think I could go lower in either tyre without compromising rolling resistance?

Almost certainly!

I have put 25Cs on my CAADX and the sidewalls say to use a minimum of 100 psi and a maximum of 130 psi but I do not even run 23Cs at 100 psi so no way am I going over that on the bigger 25Cs. I tried 90 and the tyres felt awful on the rough local roads. I am now running 80-85 psi rear and 75-80 psi front. The tyres feel much more comfortable, they roll ok, and I am not getting punctures.

(I currently weigh about 177 pounds - 12 st 9 lbs.)

 

[Drago]

You won't compromise rolling resistance by running lower pressures. Quite the opposite in fact.

Absolutely. Flat tyres roll best of all.

 

[phantasmagoriana]

I run mine (Conti 4 Seasons/Michelin Pro 4/Schwalbe Durano Plus, on different bikes) at 120psi! I worry about pinch flats - probably too much, really.

 

[bladesman73]

Thanks for the replies, great to see how each rider approaches this area

 

[Apollonius]

My 25mm Vittorias say min 7 BAR max 9 BAR, so I go for 8. No idea what these psi things are.

 

[Citius]

Absolutely. Flat tyres roll best of all.

That would be lower pressures - not zero pressures.

 

[Drago]

Unless you're in deep space there's always air pressure within the tube, not to mention any residual strength of the structure of the tyre itself.

 

[John the Monkey]

This calculator doodad should give you a starting point;

http://www.dorkypantsr.us/bike-tire-pressure-calculator.html

(The top set seems a bit off though, use the lower two calculators).