Advertise on Bikeforums.net



User Tag List

Results 1 to 5 of 5
  1. #1
    Tri Texas RustyD's Avatar
    Join Date
    Jan 2010
    Posts
    60
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Tire Size Question

    My 7 year old son has a Mirraco Icon with the stock 20x2.125 tires, Alex C303 rims. He's going to try his first triathlon in about a month, and I'm looking for some faster street tires to put on for the triathlon (just a 2 mile bike ride). Would 20x1.5 (40-406) tires fit on his rims? Like these:
    http://www.biketiresdirect.com/pkekw...a_kwest/pp.htm

    Or do you have any better suggestions?
    Thanks!
    1992 Cannondale R400 - Daytona Blue
    1986 Cannondale SR600 - Green

  2. #2
    Senior Member tyler11's Avatar
    Join Date
    Feb 2009
    Posts
    208
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    i beleve those rims are 20x1.75.. so 20x1.75 is the smallest tire you can put on there

  3. #3
    Tri Texas RustyD's Avatar
    Join Date
    Jan 2010
    Posts
    60
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I checked and it says on the rims 406x20. Does that indicate the width of the rims? They are X-Rims by Alex, C303.
    1992 Cannondale R400 - Daytona Blue
    1986 Cannondale SR600 - Green

  4. #4
    Senior Member tyler11's Avatar
    Join Date
    Feb 2009
    Posts
    208
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    406x20?? iv never herd of that
    measure the width ot the rim and thats your size
    1 1/2in = 1.5
    1 3/4in=1.75
    exct
    if the rim will fit those tires it will measure 1 1/2in or less

  5. #5
    Senior Member michaelscycles's Avatar
    Join Date
    Apr 2009
    Location
    near Pittsburgh, PA
    Posts
    104
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    They will work. 406 is the ISO diameter of the rim and 1.5, 1.75, 2.125 and so on are all 406's. Just watch you don't buy 1-1/2" even though 1.5 equals 1-1/2. When it comes to tires, fractions and decimals don't mix. Our race bikes use 1-1/4" and 1-3/8" tires. They are totally different.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •