KTM 640 adv rear tube in 990 adv?

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by kallie73, Sep 1, 2013.

  1. kallie73

    kallie73 n00b

    Joined:
    Aug 25, 2013
    Oddometer:
    3
    Hi

    Please can you advise whether a KTM 640 rear tube will work in a 990 adv rear tyre? I only want to use the tube in case of an emergency (spare). If it will work for a few 100 km's, I will replace the tube with the correct spec when I get home.

    640 tube (140/80x18) 990 tube (150/70x18).

    Thanks

    Carel
    #1
  2. Dolly Sod

    Dolly Sod I want to do right, but not right now

    Joined:
    Aug 18, 2003
    Oddometer:
    15,081
    Location:
    Richmond, Va
    What are the specs of you tube? They have a range on them., meaning they fit a range of tire sizes.

    I'd say it will be OK, as in a pinch lots of folks have used a 21" front tube in an 18" rear.
    #2