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supermoto wheel and tire sizes?

supermoto wheel and tire sizes?

Old 10-10-2017, 04:41 AM
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Default supermoto wheel and tire sizes?

I'm trying to do a supermoto conversion on the cheap. Found some used 17" warp 9s off a drz but something tells me they won't even come close to fitting.

Believe I'm looking for F 3.50x17 R 4.25x17 but wondering if I can get away with others

Last edited by Garybusey; 10-10-2017 at 04:48 AM.
Old 10-10-2017, 12:50 PM
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I did a lot of tire/rim research when planning a set of 17s for my KLX650, here is what I learned:

Depends on tire width. Look up the tires at manufacturer web sites and you will find the radials are much tighter on what can fit properly. You could go with a 3.00 front rim if you run a 110/70-17, but a 120 needs the wider 3.50. I planned on running a 110 on the front of my 650 because research and experience told me I'd have no problem on the street. My 400+ lb Zephyr 550 only runs a 110 and it can bend a turn really well. The 110 will work fine for handling, the 120 on a 250 is more about having a fat tire look.

On the rear you do want the 4.25, although a 4.00 would work if you could find it. The 130-140 run on the rear needs the minimum of 4.00 I think. A 140 will handle the power without bogging the engine down. That was the planned size for my 650 as well.

One way around wider rims is to go with bias tires that are a bit fatter, like a 110/80 or 110/90 front which can work on 2.50 or 2.75 rims and a 140/80 on the rear, which will work with a 3.00 or 3.50. The bias ply tires work with narrower rims in most cases. Don't look quite as trick Though.

If you got the DRz wheels cheap enough you could unlace them, get spokes and lace them up to the KLX hubs. Do some measuring on the Suzuki hub flanges and see how close things are there. You might be able to use those spokes if the flange diameters are within maybe 1/4" or so.

I learned there is seldom a "cheap" way to do supermoto rims. The rims are costly as are spokes. If you found a set of KLX SF rims for around $600 that would be a heck of a buy compared to building. Spokes are around $100 a set - plus lacing if you can't do it. Rims run $100-250 depending on size. So you see you have over $400 in just rims and spokes, no hubs and with hubs you could swap back and forth between 21/18 and 17/17.

Last edited by klx678; 10-10-2017 at 12:53 PM.
Old 10-11-2017, 05:23 AM
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Thanks for the insight! That was some solid info.
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