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Tyre Tube question ....

Discussion in 'Technical and Troubleshooting Torque' at netrider.net.au 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.
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  3. All inner tubes are pretty much circular in section so aspect ratio doesn't come into it. A near enough tube will be fine.