Looks like i have a flat tyre when riding .....

James23
James23 Posts: 113
edited June 2010 in MTB workshop & tech
Hi Guys

When i am riding my bike if i look at my rear tyre it seems i have a constant flat tyre. When i get off and check the tyre is firm and pumped up the front tyre is fine.

I also have a issue where my why rear tyre rubs against the back end of the frame after i repaired a puncture on it how tight does the quick release leave have to be.

Cheers J

Comments

  • supersonic
    supersonic Posts: 82,708
    So what is the pressure?

    Quick release - keep adjusting the nut and closing opening until you feel tension build up in the lever at 85 degrees from closed. Then close fully.
    GT ZASKAR CARBON TEAM

    VOODOO CANZO

    Come and see me at https://www.facebook.com/biketyke/
  • James23
    James23 Posts: 113
    Thanks supersonic,

    I dont know the pressure only got a pump that i use when i go biking... I will have a look at the quick release hopefully over the weekend.

    Cheers J
  • Clum84
    Clum84 Posts: 196
    The rear tyre always looks kind of bulged as you look down on it whilst riding. It's just perspective. I've always noticed it as well running up to 50psi on my tyres. Only reason you don't see it on the front is that there's not as much weight on that wheel.
    This is a block of text that can be added to posts you make. There is a 255 character limit
  • cooldad
    cooldad Posts: 32,599
    The old thumb test isn't very accurate. Get a cheap pressure gauge or a pump with one built in.
    Aldi? were doing some cheap track pumps for a fiver, more than adequate for MTB pressures.
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • cooldad
    cooldad Posts: 32,599
    Quick release should be firm, but still easily opened again with your fingers.

    If the tyre is rubbing against the frame the QR would have to be really loose to be causing it. Did you get the wheel back in properly?
    I don't do smileys.

    There is no secret ingredient - Kung Fu Panda

    London Calling on Facebook

    Parktools
  • diy
    diy Posts: 6,473
    I assume that after refitting the rear tyre the bead has been evenly lined up against the rim. Folding tyres and UST/2bliss tyres can need some effort to get the bead in up against the rim or beadlock (wheel dependent), which affects how the tyre sits on the rim.
    Guide to cheap bike lights Turbo Trainer Vids Play list
    Stretching & Workout Vids
  • bails87
    bails87 Posts: 12,998
    What frame? What tyres and what size? Do you have disc brakes?
    MTB/CX

    "As I said last time, it won't happen again."
  • James23
    James23 Posts: 113
    Thanks for all your help guys the bike i have is a black forest pro the spec is below:

    Specifications
    Frame Sport 6061 Alloy Frame
    Fork 100 mm Manitou R7 Super
    Front Derailleur Shimano Deore XT M771
    Rear Derailleur SShimano Deore XT M772
    Shift Lever Deore SLX shifters
    Chainset Shimano SLX FC-M660 44/32/22
    Transmission Front: 44/32/22, Rear:11-32
    Handlebar Concept SL
    Stem Concept SL, Ahead, Aluminium
    Saddle Concept Xtreme MTB, CroMo
    Seat Post Concept SL
    Brakes Avid Elixir R
    Brake Lever Avid Elixir R, hydraulic disc-brake
    Front Hub Shimano Disc
    Rear Hub Shimano Disc
    Rims Alex DP 17, 559-17

    Diy i will double check the tyre is lined up correctly against the rim.

    Cheers J
    Tyres Continental Race King foldable 55-559

Categories