What Difference Will Smaller Tyres Make

Discussion in 'Beginners Forum' started by codemagpie, Aug 13, 2009.

  1. codemagpie

    codemagpie Guest

    Hi there.

    I currently have some 700 x 32 tyres on my bike, and I'm looking to replace them with 700 x 25.

    Do you think this would make any difference to the overall average speed and also make it easy to ride, due to the smaller footprint?

    Thanks for your replies.

  2. hophead

    hophead New Member Tavern Member

    Yup, skinny tires are faster and the smaller the tire, the less effort it takes to make 'em roll.

  3. codemagpie

    codemagpie Guest

    Thanks HopHead, your response was most appreciated, so based on your reply I have placed my order......
  4. Industry_Hack

    Industry_Hack Total noob (& forum admin) Admin Staff Tavern Member

    To a certain degree. While going from a 32 to a 25 will offer less rolling resistance given a similar tread pattern, a smaller contact patch is not always a good idea.

    Twenty years ago, we all thought the hot ticket was the 19mm tire. Problem with that is the contact patch went from being wide to long. If your weight is a constant, and your wheel diameter is a constant, then your contact patch will remain constant, (in area) regardless of tire width. So instead of that short, wide patch from the wider tire, you get a long, narrow patch with a skinny tire. And that long patch offers more resistance, as the tire changes shape slightly to conform to the flat ground.

    For the record, the 700x23 was found to be the ideal size for racing.