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Thread: tyre psi ?

  1. #1
    Senior Member Prozaneki's Avatar
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    tyre psi ?

    hi all looking for a bit of advise on what tyre psi should be for normal trail riding i always seem to pump them up as hard as i can get them but im sure this aint right.
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  2. #2
    Senior Member gorehound's Avatar
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    Re: tyre psi ?

    Try about 35 PSI.
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  3. #3
    Senior Member greeneye's Avatar
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    Re: tyre psi ?

    the more psi you put in your tyres the faster your bike will roll but the less they will grip.

    personaly i use 35 to 40 psi up front for extra grip and 50 psi in the rear for extra roll.

  4. #4
    Senior Member Tango's Avatar
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    Re: tyre psi ?

    35 - 40 front and rear on 2.35 tyres


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  5. #5
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    Re: tyre psi ?

    First thing to take into account is how heavy you are.
    Bald_Bob (9 stone) would be able to get away with half the tyre pressure of PhilCruz (18 stone).

    Second is how wide are the tyres.
    The same guy on 1.8" tyres would need more pressure than if he was using 2.4" tyres.

    Some say that tubeless tyres allow you to get away with less air.

    Others have already said that if you go high, you get lower rolling resistance, but less grip (because less of the tyre is touching the trail).

    The important thing to do is to experiment to see what works for you. But you were asking for a guide; so try this:

    I'm 14 stone in my riding gear, and I use inner tubes in my tyres.
    2.1" front 39psi, rear 41 psi
    2.35" front 35psi, rear 37 psi
    If you are 7 stone, halve the above pressures. Adjust in proportion for other weights.

    I know others elsewhere on the forum believe that these pressures are too high and they go with less, even though they are heavier than me. So far these pressures work for me for the range of riding I do. However, I continue to experiment. I go higher when the trails are hard and I may go lower when they are softer or more crumbly than usual.

    Puzzle point:~ On the 2.35" Maxxis Igniter tyre sidewall, it says "minimum pressure 35psi". How do they know how heavy the rider is going to be?
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  6. #6
    Senior Member Tango's Avatar
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    Re: tyre psi ?

    First thing to take into account is how heavy you are.
    Bald_Bob (9 stone) would be able to get away with half the tyre pressure of PhilCruz (18 stone).

    Second is how wide are the tyres.
    The same guy on 1.8" tyres would need more pressure than if he was using 2.4" tyres.

    Some say that tubeless tyres allow you to get away with less air.

    Others have already said that if you go high, you get lower rolling resistance, but less grip (because less of the tyre is touching the trail).

    The important thing to do is to experiment to see what works for you. But you were asking for a guide; so try this:

    I'm 14 stone in my riding gear, and I use inner tubes in my tyres.
    2.1" front 39psi, rear 41 psi
    2.35" front 35psi, rear 37 psi
    If you are 7 stone, halve the above pressures. Adjust in proportion for other weights.

    I know others elsewhere on the forum believe that these pressures are too high and they go with less, even though they are heavier than me. So far these pressures work for me for the range of riding I do. However, I continue to experiment. I go higher when the trails are hard and I may go lower when they are softer or more crumbly than usual.

    Puzzle point:~ On the 2.35" Maxxis Igniter tyre sidewall, it says "minimum pressure 35psi". How do they know how heavy the rider is going to be?
    Only a 251 word post Steve!!!!!


    you must be losing your touch.


    Would you like to elaborate


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  7. #7
    Senior Member greeneye's Avatar
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    Re: tyre psi ?


    Second is how wide are the tyres.
    The same guy on 1.8" tyres would need more pressure than if he was using 2.4" tyres.

    this bit has confused me.

  8. #8
    Senior Member Tango's Avatar
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    Re: tyre psi ?

    narrower tyres require more pressure to keep their shape


    road bike tyres 110 psi, quad bike tyres 2 - 5 psi


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  9. #9
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    Re: tyre psi ?

    Only a 251 word post Steve!!!!!


    you must be losing your touch.


    Would you like to elaborate
    Words have failed me.
    Trouble is, I know I have done worse, much worse. Oh dear!
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  10. #10
    Senior Member greeneye's Avatar
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    Re: tyre psi ?

    narrower tyres require more pressure to keep their shape


    road bike tyres 110 psi, quad bike tyres 2 - 5 psi
    well you learn something new everyday

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