Tire pressure

Discussion in 'Motorized Bicycle General Discussion' started by velardejose, Oct 25, 2008.

  1. velardejose

    velardejose New Member

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    I bought a pcl tire pressure manometer yesterday
    Checked my tires today
    They were at ~25 psi
    Brought the tire pressure up to 40 psi
    MB is quicker than before
    Jose
     
  2. tyrslider

    tyrslider New Member

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    Lower rolling resistance = faster ride!
     
  3. cachehiker

    cachehiker New Member

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    All tires have an ideal pressure for the conditions they're being used for. My mountain tires are typically inflated from 35 psi (beefy knobbies on rough trails) to 70 psi (narrow semi-slicks on pavement).

    In general, higher pressures mean lower rolling resistance. However, there exists a point where higher pressures actually result in higher rolling resistance. It takes energy to lift a bike up and over a bump in the road and unless you're at the velodrome, at some point the energy being used to lift a bike up and over the bumps exceeds the energy being lost to tire deformation.

    The difference in speed vs. pressure vs. terrain is especially obvious on my cyclocross bike. On a race course, 35-40 psi rules as it sucks up all the surface irregularities and allows you to ride faster. On the road, 35-40 psi is like riding my mountain bike whereas 65 psi is actually pretty quick.
     
  4. velardejose

    velardejose New Member

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    I was scared because of a post about apparent spontaneous tire exploding
    Recommended pressure is 40-65 for my tires (Cheng shin c917-12)
    I think I will stick to the min value
    Jose
     
    #4 velardejose, Oct 26, 2008
    Last edited: Oct 26, 2008
  5. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Link to those posts?
     
  6. brisbane_boy

    brisbane_boy New Member

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    Yer i pump my motored bike tyres to 40psi. and on my racing bike i pump them between 80psi and 120psi.

    Yer probly better on the motored bike to not have then so hard because if they are like 60psi they are very easy to puncture.
     
  7. velardejose

    velardejose New Member

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  8. Motormac

    Motormac New Member

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    Scares me too Jose,I think about my tires all the time while riding.:(
     
  9. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Alrighty, that thread is an older one, and it was just one tire in one instance.

    I wouldn't worry TOO much, but, like with some early hang glider designs- "never fly higher than you want to fall" or "Never ride faster than you want to crash."
     
  10. Dave31

    Dave31 Moderator
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    Our Chinese motors are like a model T, Easy Riders is like a Ferrari rotfl
     
  11. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Yeah, that didn't help the tire any fo' sho'!
     

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