Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > 998 / 996 / 916 / 748 > tyre rubbing exhaust

[Bungi]

the 190 tyre is definatley tighter and less clearance than the 180?

althought they are fitted to differant rims the 180 to a 3 spoke and the 190 to a five spoke alloy mach.

[MARTIN H]

I think if perhaps the 190 is fitted to a 5.5 rim instead of a 6 it is more pinched for want of a better word and probably then a larger diameter/radius.

A 180/55 is about 99 mm tall and a 190/50 is about 95mm tall meaning the 190 (on the correct rim) should be about 4mm further from the exhaust?

[Bungi]

UNDERSTOOD HOWEVER
THE 190 WAS FITTED AS STD TO THE 996R ON THIS RIM? AND DIDNT RUB THE EXHAUST, SO IS THIS SOME kinda Phenomenon

[Bungi]

so what ive found out is...

that tyres have differing profiles(or should i say shapes )dispite what is written on the side of them,
the dunlop 209s that i was running have a profile which runs closer than say a supercorsa.
come to think of it i had a prob b4 when running a 208 and it started rubbing the rear hugger, just the tyre wasnt on there long enough to cause an issue

Martin H did you cahnge tyres when you discovered this

[MARTIN H]

No, I stuck with Diablos both 180 and 190. I do recall noticing in the past that certain manafacturers tyres were wider than others for any given width. I think Dunlops were always wider (or appeared so) than others. If the tyre is slightly wider than another make it makes sense that if its profile whether it be a 50 or 55 is accurate then the rolling radius of the tyre will be larger and so nearer to the exhaust.

I spoke to a few people when I had trouble with mine and nobody has heard of this problem before. JPM reckons I must have a short wheelbase 996R!

[Bungi]

well i cant really make much sense of it, as thinking about it the bostrum rep 998s came with dunlop 208s or were they 207's anyhow the problem exists.

potential soloution of a 16.5 rear rim being considered

[bradders]

had similar problem with tyre not cleraing hugger but that was defo hub positioning....it was at 7 oclock not 4 oclock...just chnaged from 180 to 190 so I'll have a look later, might explain why I'm so slow of the tyres rubbing

[skidlids]

Are you running a full 998S exhaust, or 998S downpipes with a different link pipe and cans

[DEMON]

you mentioned that it had a swing arm from a 748r, what bike have you fitted this to in your original post ?

[Bungi]

Originally Posted by Bungi

so what ive found out is...

that tyres have differing profiles(or should i say shapes )dispite what is written on the side of them,
the dunlop 209s that i was running have a profile which runs closer than say a supercorsa.
come to think of it i had a prob b4 when running a 208 and it started rubbing the rear hugger, just the tyre wasnt on there long enough to cause an issue

as i said chris