I'm sure that many people go from a 190 to a 180 without any problems.
Also, I know that when making changes like that you need to go thru and set up the bike to handle that change.
What specificaly do you gain from this? Not sure here.
Some might say the contact patch is larger?? Some say smaller?
Some might say the profile of the tire will changes regardless of tire pressure??
Some say the tire is smaller lighter faster??
Several tire guys I know advise to use tire that the rim width was designed for for optimal performance.
His specific problem indicates all he did was go from 190 to a 180 rear, sure he should try different things to try and figure out what works best. Why go to a 180 tire in the first place?
FWIW 165 lbs, 5'9'' Busa wobbled at 195mph lowered tire pressure, 210+, no wobble.
Originally Posted by MilleR Time
I don't know why this would have anything to do with it, and I would have to respectfully disagree. I've switched down to 180's on all bikes I've owned and will likely do so on the S1k as well.
I think your tire pressure was too low, personally. Typically in my experience I've found that high speed wobbles are a result of the tire deforming at high speeds, but being low on pressure the bike wobbles from side to side as the "stickier," sides basically pitch back and forth when they contact the ground. At those speeds they shouldn't be. Try stepping up to maybe a few psi front rear and see if your luck changes. It's much like the wobbles when you're doing high speed wheelies. Especially on the stickier tire with the even softer and larger super-sticky compounds than pure road tires.
Try letting the TC do your 'hooking up,' for you if things get feisty. I've not had my S1k on track yet, but I've gotten on the throttle pretty hard, pretty early in the corner on the street with much less grip and have had it hold pretty good on the stock tire at 36-38psi.
FWIW I'm 6'2 and 225ish, mine has no wobble up to 180.