Hello I've just joined having recently bought a k6 750.
It has a 180 rear can you fit a 190? Does it adversely unsettle the bike?
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Your question is far to general and it depends on the brand and type of tire in question. I see there that the bike is on warmers so is it safe to assume these tires are for track usage? and if so what brand and model of tire are you looking at?
The only 190 series tire that I would mount to a 5.5 inch rear rim like your 750 has is a Dunlop 190/60 GP-Pro DOT tire.
A good rule of thumb is, if the tire model you are looking at is offered in both a 190 and 180 option, then go with the 180 option for your bike which has a 5.5 inch rear wheel.
180/60 (up from older ubiquitous 180/55 size) seems to be new sweet spot for 5.5 inch rims.
Dunlop now offers their rear slick in 180/60 instead of the old 190/55 that was used previously (i've just mounted one of these on my 600 but haven't had a chance to try it yet, I wasn't that happy with the 190/55 slick on it previously). Pirelli has been using 180/60 for their rear slick and DOT tire sizes for a couple years now. The brand new Dunlop Q4 now comes in both 180/55 and 180/60 sizes.
A little more information would be helpful, but most likely my response will be the same as I've stated above.
My experience is going down from 180 to 170. I had two Ducatis at the time 748 and 916. I love the way my 748 would change direction. My 916 was slower in direction change and I would have to recalibrate my mind when riding it. I would take way wider turns. I solved the issues by going with a 170 rear. Most of my buddys where like dude you 916 needs the wider rear to handle the power and after the first-hand experience that's just not the case. I never had an issue with traction with the smaller 170 vs 180 but turn in and drop in where amazing for me. I would say litter bikes with 160hp you are fine with 170-180, with 180hp + 180 might really be needed, with 200hp+ like the New Ducati V4 200 might really be needed. Now if you do go 190 see if you can get a higher rear profile the only issue with that on the street the bike will lean over much more and that is just exacerbated with more speed. I have ridden superbikes for 20 years and tire technology is jump leaps and bounds, I have SuperCorsa on my current bike and they are just simply amazing for my type of riding (fun short weekend blasts when I can sneak away). Good luck man!
None of this is really applicable here. None of the current crop of sport or race tires are offered in a 170 option. A bigger or a smaller number on the tires does not equate to it being "wider". The width of the tire is dictated by the width of the rim. Squeezing too big of a tire onto a smaller rim than it is meant for just pinches the sides in and alters the profile/shape of the tire which can result in it handling irregularly.
At the end of the day though this really depends on usage of the bike and brand/model of tire in question.
Wow. Thats a pretty comprehensive answer. I was only asking as the tyres on it are crap for the track and i have a set of GP Pros in the garage i was going to bung on it.
It's mainly a track bike
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Sorry I missed this 2nd reply on the thread here. Glad you clarified things here a bit. So yes, to answer your question this would be an acceptable rear tire for the bike. The GPA-Pros only come as a 190/60 and a designed primarily for a 5.5 inch rear like your bike has (they can also be fit to a 6.0 rear as a liter bike has), they are not offered in any other size.
The GPA-Pro was the spec tire for MotoAmerica Supersport for several years. I've run them on my 600 as well and they work well.