Thinner tyres - harder work??!!

Discussion in 'Cycling Equipment' started by aboylikedave, Jul 13, 2011.

  1. aboylikedave

    aboylikedave New Member

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    Hi there

    I'm commuting on a Trek 7.5 and was using Bontrager Racelite Hardcase 700 x 28, 105 psi. I'm about 75kg and it's a very hilly ride. When these needed replacing I changed to Conti Gator Hardshell Folding 700 x 25 115 psi.

    They are (according to specs) lighter and are narrower. When I put on the rear it felt great but as soon as I put on the new front, the weird thing is it really does feel harder to pedal!!! And I mean noticeably.

    Is there any possible explanation other than being purely psychological? Apart from me ageing rapidly!

    Cheers

    Dave
     
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  2. Scotty_Dog

    Scotty_Dog New Member

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    Verify:
    1. wheel is in straight
    2. brake is not dragging
    3. quick release skewer and cones are adjusted properly
     
  3. Eichers

    Eichers New Member

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    HI aboylikedave, at 115psi they should be rolling faster? Perhaps you could try them at 105psi :)
     
  4. dabac

    dabac Well-Known Member

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    There are a few possibilities. On big contributor to rolling resistance is how supple the sidewalls are. There'll be some wrinkling when you're rolling along, and on a thick sidewall this'll steal more energy than on a thin sidewall. There may be a clue in the name "hardshell"..

    Another thing is that higher pressure and narrower tires become bouncier. Shouldn't really give the feeling you're reporting though.
     
  5. aboylikedave

    aboylikedave New Member

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    Yes, no, I think so! The wheels spins unrestricted and is running straight.
     
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