Tyre sizes

[kwakamad]

Hi, i was curious to no is it ok to run say a 190/50/ even a 195/55 on a zxr750 rim which would normally run a 180 rear?
I would have said "NO" as it could be dangerous at high speed ie track days and you should always run the recomended tyre size...
Was talking with a guy who races, recently who said it would be fine and no drama at all !!! Seems odd to me and if you were to run the larger
tyres what would be the difference handling safety etc?
Any info be great thx

[the kid]

It will probably slow your turnin a little , putting a wider tyre on .

[kwakamad]

Hi the kid, thats fine more concerned on safety side of things do you reckon be ok and safe to do so!!

[Stereo]

Related article here...
http://www.sportrider.com/tech/tires/14 ... index.html

To sum it up, cramming a tire into a smaller size rim will cause a multi radius tire.... And that will make it feel squared off and funny.... it will tip in slowly, then quickly and then reduce again as you get further into the lean angle...

Also, even though the theory is that this will get more rubber on to the road... tests didnt really show any improvement in grip...

[kwakamad]

Thanks Stereo for the sum up and link!!

[dave#3]

I always run 190/55 slicks on my zxr750 and it's fine (although raised at the back to compensate).

[kwakamad]

Cheers dave#3 may do a trackday and try both sizes my main concern was or is it safe to run the 190 you have answered thanks!!

[dave#3]

Cheers dave#3 may do a trackday and try both sizes my main concern was or is it safe to run the 190 you have answered thanks!!

I do crash pretty often .... maybe it's not so safe afterall

[ivan]

i have 180 instead of 190 standard. i found that bike tips in quicker