Tyre pressure

haveitmyson
haveitmyson Posts: 38
edited February 2011 in Road beginners
This sounds daft! but is there such a thing as a recommended/common tyre pressure?

Comments

  • rick_chasey
    rick_chasey Posts: 74,656
    between 6-7 bar.

    On UK roads, 6 should be right on.
  • emx
    emx Posts: 164

    On UK roads, 6 should be right on.

    unless you are 25 stone - in which case 6 bar will not be anything like 'right on'....
  • jibberjim
    jibberjim Posts: 2,810
    This sounds daft! but is there such a think as a recommended/common tyre pressure?

    It depends on your weight and tyre.

    Essentially there's an optimimum deflection in the tyres (well a range as feel/speed/comfort/control etc. comes into it too)

    Zipp publishes:
    http://www.zipp.com/accessories/detail.php?ID=72
    for their 21mm clinchers - narrower tyres have higher pressures for the same deflection.

    If you're heavy (90kg+) you'll head towards the max the tyre can do. If you're light you'll head towards the minimum the tyre will do.
    Jibbering Sports Stuff: http://jibbering.com/sports/
  • Basically, it depends on the size, width of tyre and the weight of the rider.

    Also, to confuse a few, tubeless tyres can run at a slightly lower pressure (if needed) because you can't pinch puncture.

    It's a black art trying to find your best pressure, but mine seems to be 100psi front 110 rear and I weight 71kg.
    CAAD9
    Kona Jake the Snake
    Merlin Malt 4
  • Check your tyre - it will have a recommended (or max) pressure printed on the side wall
    Check your wheel rim - it may also have a max pressure identified
    Get close to these maximums = lower rolling resistance, lower risk of punctures, but possibly less comfortable
    ... must train harder
  • rick_chasey
    rick_chasey Posts: 74,656
    emx wrote:

    On UK roads, 6 should be right on.

    unless you are 25 stone - in which case 6 bar will not be anything like 'right on'....

    Pfft.

    Like a posh clothes shop, I don't cater for people who are 25 stone.
  • sub55
    sub55 Posts: 1,025
    Check your tyre - it will have a recommended (or max) pressure printed on the side wall
    Check your wheel rim - it may also have a max pressure identified
    Get close to these maximums = lower rolling resistance , lower risk of punctures, but possibly less comfortable

    bo you rekon :roll:
    constantly reavalueating the situation and altering the perceived parameters accordingly
  • It depends on the tyre. The ones I run at the moment take 6-8bar, and I only ever run them at 6. If I lived in Switzerland or Northern Italy and only rode time trials, then I might run them at their max. The quality of the road surface and the type of cycling you are doing influence the pressure you wish to run at.
  • sub55
    sub55 Posts: 1,025
    It depends on the tyre. The ones I run at the moment take 6-8bar, and I only ever run them at 6. If I lived in Switzerland or Northern Italy and only rode time trials, then I might run them at their max. The quality of the road surface and the type of cycling you are doing influence the pressure you wish to run at.

    just to be contentious
    i will disagree with you :twisted: the PSI would remain the same whatever
    the type of cycling you are doing
    however the choice of tyre would change
    constantly reavalueating the situation and altering the perceived parameters accordingly
  • geebee2
    geebee2 Posts: 248
    No one mentioned that in wet weather you might want a little bit less pressure, also for extreme descents.

    If you don't have enough pressure you can get a "snake-bite" puncture if you hit a pot-hole.

    I'm nearly 95kg, and ride between 115 and 120 psi ( about 8 bar ).
  • jthef
    jthef Posts: 226
    geebee2 +1
  • cougie
    cougie Posts: 22,512
    95 is good for me on Contis - less in the wet,
  • rake
    rake Posts: 3,204
    pinch hard between thumb and forefinger, it should feel firm but not like rock.
  • 16.5st, running 105psi front 110back.

    Had punctures every 5 miles or so at 90/95

    if your carrying some lard, up the pressure. Job done
    exercise.png
  • vorsprung
    vorsprung Posts: 1,953
    I'm 80kg and do a lot of long distance riding. I usually run the front at 90psi and the rear at 100psi. I use 25mm tyres
  • Bobbinogs
    Bobbinogs Posts: 4,841
    edited February 2011
    That's interesting Vorsprung, particularly as I often spend w/e's in the same area around Exmoor. I have spent the last 6 months or so happy on 90/100 (I'm about 68kg) but needed to swerve into the gulley the other night to avoid an oncoming car (pitch black country road), hit a pothole and got a snakebite. It was no fun changing tubes but I thought it was nice that of 3 cars that passed, 2 stopped to ask if I was ok.

    Anyway, figured I need a few more psi but your post probably suggests I just need to write it off as in "smack a pothole, expect trouble".
  • As Sean Kelly once famously said on Eurosport in response to "so what tyre pressures do you recommend Sean?"..... "Well just make em nice and hard"
  • Just to add to the data,

    Summer: 89Kg 110psi front 120psi back on 23mm (Vredestein Fortezza TriComp)
    Winter: 89kg 90psi front 100psi back on 25mm (Continentals GP4season)
    :)
  • vorsprung
    vorsprung Posts: 1,953
    Just to add to the data,

    Summer: 89Kg 110psi front 120psi back on 23mm (Vredestein Fortezza TriComp)
    Winter: 89kg 90psi front 100psi back on 25mm (Continentals GP4season)
    :)

    Don't you loose some weight for the summer?
  • keef66
    keef66 Posts: 13,123
    I put on weight for the winter!
  • Only a kg or so, fat reserves are turned to muscle. :wink:

    No but really.

    Calorie intake is reduced during the winter as training effort is reduced; I tend to ride 20% - 25% less distance (do not fancy the long wait for the wife in the cold, if anything happens) and pace (I am a wus in the winter, never fancied a hard fall at speed when hitting a corner) also other forms of exercise come into play, so Diet changes.

    I gather most people bulk up!