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25mm tyres on 23 mm rims tyre pressure.

  • This topic has 9 replies, 9 voices, and was last updated 6 years ago by Nat Jas Moe.
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  • May 19, 2020 at 7:34 pm #30742
    thefatcyclist

    Hi it has been a while.
    I just replaced worn tyres with new ones and decided to up to 25mm, on my Moda road bike. The old ones had a real flat middle on the rear. I weigh 70kg the bike is around 9 kg and I frequently ride with a backpack full of groceries. say 7 kilos.
    They are on and what a difference new rubber makes. But I need to decide what pressure to ride. I rode115 psi on the old ones unloaded and 120 loaded and the charts say 90 psi for the new tyres. But should I take the 23c into consideration or just ignore it.
    It is riding well, but I just wanted to check.

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Viewing 9 replies - 1 through 9 (of 9 total)
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  • May 25, 2020 at 5:29 pm #959377
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    Nat Jas Moe

    With regard to the tyre

    With regard to the tyre pressure when the temperature goes up,  this could easily be because you inflated when it was cold and with the heat you will find an increase in pressure as air expands as you heat it up.

    May 25, 2020 at 2:32 pm #959375
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    check12

    Digital tyre pressure gauge –

    Digital tyre pressure gauge – https://www.wiggle.co.uk/topeak-smarthead-digital-gauge-d2/?lang=en&curr=GBP&dest=1&sku=5360389283&kpid=5360389283&utm_source=google&utm_term=&utm_campaign=Shopping+-+All+Products&utm_medium=base&utm_content=mckv%7CsfDTNtYd6_dm%7Cmcrid%7C295296961877%7Cmkw%7C%7Cmmt%7C%7Cmrd%7C5360389283uk%7Cmslid%7C%7C&mkwid=sfDTNtYd6_dm&pcrid=295296961877&prd=5360389283uk&pgrid=57437518777&ptaid=pla-522238028083&gclid=EAIaIQobChMI5vCE75zP6QIVGODtCh1FyQslEAkYASABEgK2i_D_BwE

    May 25, 2020 at 11:09 am #959373
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    thefatcyclist

    Hi thanks everybody. Clear

    Hi thanks everybody. Clear that at 90/90 I am up too high, So I will come down a bit, see how it feels, should reduce any ballooning as well but I do not see much evidence.. Thanks all. But I need to buy a decent  pressure guage, because in the heat last week the stand pump was saying I was at 105 front 100 back.

    May 21, 2020 at 11:50 am #959371
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    bobbinogs

    ^ what he said.
    ^ what he said.

    May 21, 2020 at 8:49 am #959369
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    iandusud

    I weigh 70kg and run my 25mm

    I weigh 70kg and run my 25mm tyres at 65/70 psi f/r respectively. However it does depend a bit on how you ride. Some people are “lighter” on a bike then others. What I mean is that some people are better at absorbing road shock by taking the weight off the saddle and bars as they ride over rough ground, others seem to plough through everything and are constantly getting pinch punctures unless they keep their tyres rock hard. They also give their wheels a much harder time. Learn to ride light and get the benefit of lower tyre pressures. 

    May 21, 2020 at 6:01 am #959367
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    Chris Hayes

    80psi should be sufficient.

    80psi should be sufficient. 85 max.  I sometimes ride with a German mate who pumps his tyres up to 130-140…never understood it.  He’s fast as hell though…just nothing to do with tyre pressure! 

    May 20, 2020 at 10:26 pm #959365
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    Simon E

    My rule of thumb for 25mm

    My rule of thumb for 25mm tyres: start with rider + load in kg = psi in front tyre. Add 10 psi for rear. So for you: 75 psi front, 85 psi rear (5 & 5.5 bar).

    Then experiment by trying 10 psi less in each, then 10 psi more. That way you get a feel for each.

    I’d not go much lower than 65, and bear in mind that if your tyre loses a few psi in between pressure checks you could be in the 50s, which would make a pinch puncture far more likely.

    May 20, 2020 at 9:27 pm #959363
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    Pilot Pete

    Wow, 115psi, must have been a

    Wow, 115psi, must have been a rock hard ride! I ride 25s and I inflate my rear to 85psi and front 80psi. Seems ok. I’m 83kg!

    May 19, 2020 at 8:15 pm #959361
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    CXR94Di2

    Follow the guidance, rim size
    Follow the guidance, rim size isnt too important.

    I ride nothing under 28mm and usually 40mm all purpose G Ones

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