actually because the 180 is going on a wider rim it will flatten it out and increase the contact patch for straight line... but reduce the profile and give it reduce handeling... or in theory it should... :idk:

What? A 180/55/17 is taller than a 190/50/17.

55% of 180 is 99mm. 50% of 190 is 95mm, so the 180 is a taller tire.

I agree with the contact patch statement though. I do however read on the Z1000 forums the best mos on that bike is to go down to a 180 due to the quicker turn in.

Interesting conversaton and comparisons and all BUT since a 190/50 came on my R1 and a 180/55 came on my R6 that's what will stay on them...I'll just trust Yamaha got it right. :idk:

Negative. Especially when you put a 190 on a 5.5" wide wheel. Trust me, the center of the tire is taller on a mounted 190 on a 5.5" wheel than a 180 on the same wheel.

Prove it genius.

Read my post again. The one you just replied to.

I'm talking about the 55 which is stock on a R1. I think Busa's are/were the only bikes that the 50 came stock on, I could be wrong though. I think 190/50s are rare these days. You'll find them on a lot of 600s though.

I still dont buy it. 180 sidewall height is 4mm taller. A 190 on a 5.5 rin versus a 6.0 rim wont change the height of the time by much at all. If anything they are probably closer to the same but the 190 won't be taller. Do the geometrical math. As a matter of fact my buddy here ar work has a 190 on his RC. I'll measure it today and compare to my bike and I'll let you know.

I believe my stock R1 has a 50...not a 55. My R6 has a 55 but in 180 of course.

The 600 wheel is more narrow. It will push the center of the tire up more because the sidewalls are closer to gether. Creates HUGE contact patches for the 600 and 750 riders.

Like I said, I could be wrong.

It is a 50 on your R1.