PSI

[Iainj837]

I have just got a set of Schwalbe Marathon Plus tyres.
The question is regarding the PSI the min is 85 and the max is 115.
what PSI would you use ?

 

[Young Un]

For my road bike I have 110 rear and 100 front but them I am about 12.5 stone.

Steve

 

[spandex]

110 or 115

 

[Iainj837]

My bike is a touring bike but it is used for commuting

 

[Iainj837]

Thanks Spandex and young un

 

[mickle]

The upper limit to tyre pressure has little to do with the tyre itself but with the structural integrity of the rim. In the workshop we fully inflate the tyres of particularly cheap bikes before we set-up the brakes because the side walls can flex enough after inflation to actually jam the brakes on. Although it's common knowledge that under inflated tyres have higher rolling resistance there is some evidence which suggests that above a certain pressure, depending on the tyre, rolling resistance actually increases because the tyre can't flex over bumps.

I find 100psi front and 110psi rear to be a good compromise between comfort and speed.

 

[Iainj837]

Thanks Mickle

 

[Joe24]

I have mine pumped up all the way to the max. Always have done.
I only weigh 9 and half stone, dont find the bumps too hard though. Now when i had my tyres pumped up really high(slightly over the max) i didnt like it, was way too harsh of a ride. Felt every ant i went over.