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Tyre pressure PSI etc

Discussion in 'Beginners' started by Bigtallfatbloke, 22 Nov 2007.

  1. Bigtallfatbloke

    Bigtallfatbloke New Member

    I have some schwalbe marathons and a new road pump which I am itching to use...however I cannot see on my tyres what maximum pressure they will take as the text is so small I cant read the bloody thing....any idea what a good pressure would be for such tyres? My pump says it will go up to 120psi, is that going to be to much? I have only ever pumped up with a hand pump until the tyre felt hard enough.
     
  2. Pump up the volume BTfB - I weigh 105kg (+/- :blush: ) and the tyres feel good at '120psi' or thereabouts. If it's raining then the pressure comes down a bit... by feel really. No idea if my Tesco track pump is accurate, but it works.
     
  3. punkypossum

    punkypossum Donut Devil

  4. marinyork

    marinyork Resting in suspended Animation

    Location:
    Logopolis
    My marathon pluses go upto 85
     
  5. Brock

    Brock Senior Member

    Location:
    Kent
    Mine take up to 100 :blush:
     
  6. Arch

    Arch Married to Night Train

    Location:
    York, UK
    Use a magnifying glass to read the text on the tyre, and make a note of it for the future?
     
  7. ChrisKH

    ChrisKH Shorts Adjustment Expert

    Location:
    Essex
    Mine are marked 85 but I use 90 (except in the wet). But they're 16 inchers.:blush:
     
  8. Unkraut

    Unkraut Master of the Inane Comment

    Location:
    Germany
    Ditto. I thought that if you pump them up much harder than this, you lose traction as they tend to 'bounce' on uneven surfaces.
     
  9. Hurricane Steve

    Hurricane Steve New Member

    Location:
    Hamburg
    Hi bigtalfatbloke
    Tyre pressure is important, I'd suggest using the tables Punkypossum posted. You not only have a better ride, but if your tyre is under pressure you have more friction which means wear and tear and its a tad more energy needed from your side, the rim tape protects the tube from the spokes and any sharp edges, and if the tyre is under inflated this tape could shift from position and the result being a pucture. I suggest inflating to 10psi or so under suggested max. Give it a try and you'll see in no end what a difference the correct pressure makes.
     
  10. Ignore what's written on the side of the tyre, it's not meaningful

    See what His Holiness Sheldon says
    http://www.sheldonbrown.com/tires.html#pressure

    He does detail the problems of over- and underinflation and also has a table suggesting pressure baed on tyre sized and your weight.
     
  11. Danny

    Danny Legendary Member

    Location:
    York
    As I am not convinced you can trust the pressure gauge on a pump, I usually just rely on pressing the tyres to see if they feel hard enough.

    Or am I just being a luddite?
     
  12. Tynan

    Tynan Veteran

    Location:
    e4
    My marathons are marked for 100psi, what Sheldon says natch

    I go 100 front and 'a bit more' on the rear, the harder the better is my experience, unless your fillings start coming loose
     
  13. Cathryn

    Cathryn California Correspondant

    I love Sheldon.
     
  14. OP
    OP
    Bigtallfatbloke

    Bigtallfatbloke New Member

    many thanks all.

    I pumped up front and rear today to 100psi and all seemed well enough on todays loop....Tomorrow I will let just a touch out of the front tyre as per the Sheldon article and see how I get on. I reckon I have been riding with my tyres to soft a stoday the bike seemed quicker and lighter, although I did slip a couple of times on cornering which i have never done before.
     
  15. Jacomus-rides-Gen

    Jacomus-rides-Gen New Member

    Location:
    Guildford / London
    I have found my optimal pressure to be 100psi (F) and 112psi (R), though I will have to play a bit as I am soon take delivery of some 25c tyres so will have to change my inflation.