NVM searched and found my answers
+1. 180/55 is the correct tire for your 5.5" rim and there is no argument for a wider tire with the low power output of a 749. When I bought my S4Rs it had a 190/50 incorrectly fitted and changing to the correct size was a revelation. Comments below from my review of the new tires (Pirelli Diablo Rosso's)On the 996sps I only use 180/55-17 on my PVM 5.75" x 17" rim Supercorsa SC2 (track bike)
On the 999s I ride street only and 180/55-17 OEM forged wheel.
I feel safer on the 180's Vs. the 190's at a full lean and power coming on hard.
I think many would be surprised that the "contact patch" difference between the two tires are almost the same, on the rim width that compromises the 190's.
Sticking that big 190 on anything less than a 6" wide rim becomes a waste of money, at least for me. Good poser factor though......
I am in the A group at trackdays on the 996sps, I loose no traction with a 135rwhp motor with my correct sized rear tire, the 180-55-17, I've run them both at the track and the street.
no.Since this thread is alive and kicking, Ive read that people who put a 190/55 on their 749 have had to get longer chains because the rear tire was scraping on the swingarm, and Ive also read that people had to either raise the front or lower the rear to even everything out!! Is this true?
Does anyone know what applications the 190/50 would be better for than the 190/55? I was more or less at max lean on my buddy's R1 a couple weeks ago and I could feel myself not only riding on the edge of the rear tire, but being pushed up by the sidewall. Not only that, but by the look of the chicken strips on the front the bike coulda leaned over further with a taller rear tire. I ultimately ended up taking corners slower on the R1 despite the fact that the rest of the chassis felt pretty good.
I don't know where you get your information from. This is directly from Pirelli:Actually, I recall a test that showed that the 190 was lighter, not heavier, by one lb. But of course that depends on the manufacturer and model.
If a 190 was so great, then I would think that the TZ250, RS250 and other 250 cc GP bikes (which make over 100 hp) would use them, right? I mean, traction is everything in racing isn't it?190/55 has a much better contact patch than 190/50. Stick with the 190/55. The front tire is VERY difficult to get boogies to the edge of the front. Don't guage the rears performance by the fronts looks. I'm generally pretty fast at tracks days, as my racing friends, and almost none of us get to the edge of a front tire.