Front Tire Rub

Discussion in 'Wheels' started by Turk55, Aug 11, 2012.

  1. Turk55

    Turk55 Active Member

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    So I had a shop install a 21" front tire on by 09 SG and it rubbed the inner rear of the fender burning the paint :(, what could of caused this?
     
  2. Hoople

    Hoople Account Removed

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    I'll play. What's the complete tire number of the original tire and complete tire number of new 21" tire.
     
  3. 173ABN

    173ABN Active Member

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    I have a 21" on my 09 RK and have no rubbing issue, plenty of room 120/70-21 metzler
     
  4. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    As tires heat up they expand. When the shop mounted the 21" tire did they make sure there was 3/8"-1/2" clearance all the way around the tire?
     
  5. Turk55

    Turk55 Active Member

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    Trie size 120/70-21 Avon old tire was 120/70-21 Dunlap with no problems
     
  6. Hoople

    Hoople Account Removed

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    Now that is strange. I was really expecting to see the aspect ratio of the tires (70) to be different and they are not.
    Those tires should have the same overall height. I now have the same question as you have.
     
  7. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    As the older tyre that came off was worn then it will have had less rubber on it and may not have fouled the fender and any new tyre with a full set of rubber would foul the fender
    So perhaps the fender has moved in the time between the dunlop being new and the avon being fitted
    If you loosen all the fender mount bolts and try to fine adjust the fender there should be a wee bit of movement and there may be enough play to move the fender away from the tyre
    These are just my thoughts on what may have happened to create your current situation

    Brian
     
  8. Turk55

    Turk55 Active Member

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    Had someone say that for the tire to miss fender the fender mount holes need to be sightly oval to give room for adjustment, anyone hear of doing this?
     
  9. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    The aspect ratio is the same but the Avon has a different profile than the Dunlop. When the tire is cold how much room is there from the tire to the fender? Like Fin suggested the fender will move a little without modifing the holes.
     
  10. Hoople

    Hoople Account Removed

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    Yep, then it must be something that applies to the crown motorcycle tires have. That's crazy. If not by size, how can you shop or experiment with new tires?
    I was thinking of trying a set of Avons next time around. Now I can't because I mail order my tires. They may not fit even though the numbers match. That's crazy if you ask me. That's like saying this 1/4 28 nut won't fit your 1/4 28 bolt because the manufacture put a special profile on the thread pitch.