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Tyre Tube question ....

Discussion in 'Technical and Troubleshooting Torque' started by orekin, May 21, 2010.

  1. My rear tube is 120/90-17

    I've looked up the inch equivalent ... 4.50/4.75 (http://dr650.zenseeker.net/Tires.htm)

    Motorbike Shop did not have it, but said 4.50/5.10 will work fine

    Will it ?

    Are the inch tubes always 100% aspect ratio so 4.50/5.10 is a range for the section width ?

    Or is it similar to the metric where one is the Section Width and the other is the aspect ratio ? ie 4.5 is section width and 5.10 is height ?

    Apologies if this is a really dumb question. Been googling and trying to work out the answer, but not getting anywhere.
  2. All inner tubes are pretty much circular in section so aspect ratio doesn't come into it. A near enough tube will be fine.