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Old 29-Sep-2004, 09:43 AM
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contact patches at full lean.................

someone will know this i'm sure...................

does a 190/55 on a 6 inch rim give more contact patch at full lean than a 180/55 on a 5.5 inch.

i think it does but not sure???
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Old 29-Sep-2004, 09:54 AM
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I reckon its the same!!!
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Old 29-Sep-2004, 12:50 PM
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If could actually notice the difference, you'd already know!
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Old 29-Sep-2004, 01:58 PM
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My two-pennorth..
Because of the greater radius of the 190/55, I reckon you'd have more area in contact with the track/road - but less 'ground pressure' per sq mm because the bike's weight is more widely spread. (so on a wet/slippery surface you'd actually have less grip).

I could well be wrong though! One for Shazzam I think..
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Old 29-Sep-2004, 01:59 PM
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dickieducati dickieducati is offline
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yes i await an essay at some stage, although i'm kind of with your thinking.
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Old 29-Sep-2004, 02:27 PM
David Cook David Cook is offline
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My 996SPS came with a 5.5"/190 rear setup which was changed to a 180 for all the "advertised" advantages. I then changed to mags and had a 6" rear but maintained a 180 tyre.

I've now got a 190 (D208RR) for Catalunya in October, having been convinced by Dunlops Sales Manager that the benefits are noticeable.
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Old 29-Sep-2004, 02:33 PM
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Having just bought a bike with what looks like a 6in mag rear, fitted with 180 (BT0012ss (?))...why does the tyre in general look wider and flatter than my 748 fitted with standard rear wheel and a 180 (pirelli diablo)?

Does the slightly wider wheel flatten the profile of the 180 tyre, or is the difference I can visually see due to the diference in tyre profiles from make to make?

Does that make any sense at all?!?!?
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Old 29-Sep-2004, 02:44 PM
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pretty much answered your own question. it should have a 190 on if its a 6inch rim, the profile (as you correctly noticed) will be flatter as the tyre is being widened out. pop a 190/55 on and it should turn in better.
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Old 29-Sep-2004, 03:08 PM
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Well, thats what I thought...but then why do people stick a 180 tyre on a 6 inch rim to quicken the steering, if, as you suggest, it flattens out due to the wider rim???
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Old 29-Sep-2004, 03:18 PM
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standard rims on a ducati are 5.5 inch
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