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Tyre pressures?

London_Rick 30 Jun 22:41  

Joined: 12 May 2010

Posts: 13


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Has anyone got any ideas/advice about what is the ideal tyre pressure to use?

I ride a hybrid as I do a fair bit of on-road but also like to get off-road and along tracks and paths as often as possible. Its basically a mountain bike set up but with smoother tyres. I was told that tyres should always be inflated so they are 'really hard' but what constitutes 'really hard'? I currently have Kenda Quickroller Sport tyres and it says on the tyre wall '80psi max'. I have pumped them up at the garage but 80psi seems bloody high pressure to me - my car only needs 30psi, so I am currently running them at 40psi. Anyone got any ideas??

My Latest Route: May 2010 Baldock to Therfield Circular
dudley 01 Jul 07:07  

Joined: 16 Jan 2009

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your car only needs 30 psi
a tractor runs on around 9 (nine) psi
a road bike on 700x23 tyres runs on 120-130psi
mountain bikes will run on between 40 and 80 psi, depending on terrain and tyre size.

Do NOT use your car as guidance. I think you'll agree your car tyre and car look somewhat different to your bicycle!

there is a reason your tyre wall says 80psi max.

If you are doing a lot of road miles, i'd get the pressure up to near 80 if i were you.

soft tyres on the road increase friction, wear out quicker, and have an increased risk of puncture through crimping when you hit a pothole..

My Latest Route: Nov 2009 Forth Estuary Circular

longbob 23 Jul 12:31  

Joined: 22 Jul 2010

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i run my road bike at 120 psi and my mountain at about 60psi.

it's mad to think you put that much pressure in such small tires but you will find it far easier to cycle with the correct psi...the only time you may want to drop down is on really ruff tracks as you get stlightly more contact with the ground...well, that's what i find anyhow.

if in doulbt, just go with what the tire recommends!

STID 23 Jul 12:51  

Joined: 02 Jun 2009

Posts: 116


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If you check the rim of a tyre, the ideal pressure recommended by the manufacturer is print on it. This is through years of development and testing and what they know is best for that tyre set up.

My Latest Route: Aug 2009 Abingdon to Long Crendon and Long Hanborough Loop.

Pesmo 25 Jul 22:28  

Joined: 17 Jul 2010

Posts: 89


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There is room for a bit of experimentation though. I run my rear tyre at 60psi as recommended on the side wall, but if I do the same on the front the vibration is awful on rolled shale tracks. So I tend to run the front only at about 40psi as it dampens out the vibration through the handlebars really well.

guitarpete247 07 Mar 20:15  

Joined: 14 Feb 2011

Posts: 35


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I've always run my tyres at the recommended pressures. I have not had a 'rapid pneumatic deflation' incident in a very long time. The last one I had to repair was to a nip in the tube when I fitted new tyres. Before that was when someone borrowed my bike without my knowledge and didn't check tyre pessure leading to snake bites. The correct pressure helps avoid punctures.

If you feel trying them at lower pressure be prepared for using your repair kit more often.

My Latest Route: Apr 2011 Newton Burgoland Circular via Fenny Drayton and Bosworth

vavb 07 Mar 20:35  

Joined: 17 Sep 2010

Posts: 6


I always run my tyres back and front just a couple of pounds under the max pressure marked on the tyre. It gives a hard ride but you will get a hell of a lot less punctures.

ozzie51 07 Mar 21:49  

Joined: 24 Feb 2011

Posts: 39


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After purchasing a good floor pump with an accurate gauge I found I was low on pressure with my no gauge hand punp, and I have not had a puncture in the last 1000miles.


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