<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jacka$$ »</TD></TR><TR><TD CLASS="quote">You might ask Banda, but I'm pretty sure that he runs a 160 section maxxis rear, & has a 4.25" rim.
Yeah, what he said^
I know it seems a little odd compared to street bike stuff.
6" rim = 180 or 190
5.5" rim = 170 or 180
4.5" rim = 160 or 170
(Can you even get any good road racing tire in a 160 anymore?)
If you go to an AMA Supermoto round you'll see that it is now almost exclusively 5.0" rims with ungrooved Dunlop KR108 slicks, size 165/55/17 in either soft or medium depending on the track. I've heard that Dunlop will be coming out (probably for next season) with new Supermoto specific tires that will be made in America and priced drastically less than the current tires.
I run DOT tires (Dunlop 208gp front & 207gp rear) because I'm so slow that I don't need the extra grip of slicks. I tried them but didn't like how it takes a lap before they start to grip if you don't have tire warmers. My old bike had a 4.25" and I ran a 160... my new bike has a 5.0" and I put a 160 on it but the profile seems too flat. When you lean it all the way over to where the pegs start to drag then you go off the edge of the rear tire. I've scared the bejesus out of myself a couple times. I have a new 170 that I'm putting on tomorrow and going riding Wednesday, I can't wait to see if it makes a difference.
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chriscap »</TD></TR><TR><TD CLASS="quote">Dave a Maxxis 160 is the correct tire for a 4.25... although the 165 will work. I've used a 160 very successfully on a 5" rim also.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eric Landstrom »</TD></TR><TR><TD CLASS="quote">A 160 on a 4.25 is too big.</TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eric Landstrom »</TD></TR><TR><TD CLASS="quote">A 160 on a 4.25 is too big. You're likely to never use all of the tire (unless you low side). Besides I told Darren Hicky to have 150s on hand at the DCTC.
I don't know if that is your speculation or testing results but a 160 is optimum for a 4.25" rim according to my experiences. I've used Avon, Pirelli, and Maxxis, all 160 DOT tires, on a 4.25 rim and they were perfect, wears right to the edge and the tire keeps the profile it was designed to have. A 5.0" is much harder to find DOT tires for, I'm using a 207gp in a 170 on my 5.0" but it required swingarm modification to fit. The 160 was absolute crap on the 5.0" rim, it stretched the tire out which flattened the profile and caused heavy/slow steering. When you got close to the point of the pegs dragging you ran out of tire and lost the rear. The correct size tire for your rim width is very important.
I have a 150 Pirelli on my 4.25" rear at the moment. But based on this thread (from last year!) I purchased a set of Maxxis tires with a 160 rear. It doesn't look like it's going to be possible for me to switch out my tires between now and the track day on Sunday.
I'll likely be switching before the track day at Stockholm.
I'm no expert, but I'll post my feelings on the matter as soon as I have some experience on both.
Anyway, yes, I've spent way too much time running the wrong sized tires with my SRX600 but not on supermoto as SMs are new to me. Notwithstanding a rim of a given size can take a number of different tire sizes.
So let me throw another question into the mix here. If I had a choice between a 4.25" rim versus a 5.0" rim, which would be the better choice, and why? Do tire choices make the decision for me, or do I go with the rim size and figure out the tires later?
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