tire sizes - MVAgusta.net
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post #1 of 20 (permalink) Old 01-18-2018, 03:40 PM Thread Starter
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tire sizes

To all of you experts out there a question

If I go from a 190/55-R17 to a 190/50-R17 will I or should I notice any difference in handling and will the speedo read differently?
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post #2 of 20 (permalink) Old 01-18-2018, 03:58 PM
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That's a 9.5 mm drop in rear height. It'll slow steering a bit unless you drop the front the same.

Will you notice it? That depends on how in tune you are with your machine.

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post #3 of 20 (permalink) Old 01-18-2018, 03:59 PM
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Go here: Tire size calculator

Enter each size in the box but on two lines.
Click calculate and see the results.
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post #4 of 20 (permalink) Old 01-18-2018, 04:15 PM
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That will barely be Noticeable. I mean... If it is a new tyre that will give you already a bigger difference in feel.

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It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


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post #5 of 20 (permalink) Old 01-18-2018, 05:24 PM Thread Starter
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so what size front tire is compatible with a 190/50? Typically I run a 120/70-17
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post #6 of 20 (permalink) Old 01-19-2018, 01:14 AM
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Be wary of using tyre sizes not specified by the manufacturer. It's an easy win for an insurer to deny an accident claim.
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post #7 of 20 (permalink) Old 01-19-2018, 02:43 AM
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Quote:
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so what size front tire is compatible with a 190/50? Typically I run a 120/70-17
120/70-17 is a standard match for the 190.

Apart from the obvious change in effective ride height and circumference circa -3%, typically you will find that the rear profile shape will change slightly. The 190*50 profile will, while having the same nominal width as the 190*55, exhibit a 'nominally' shallower profile than the 190*55 that will have a more noticeable effect that the pure circumference difference when upright. This will effect the rate at which the bike turns in or drops into the bend i.e slow it down, so combined with the drop in rear ride height (assuming you don't compensate) it will be noticeable. Racing on these sizes at the start of last decade (oh i'm getting old) moving to the 55 from the 50 on a 6" rim the effect was very noticeable, as it had the reverse of what you will see.

Caveat, all 190*55's etc do not have the same profile shape. If you think back to the early Michelin Pilot Power Race the profiles were very sharp almost a V compared to the Pirelli Super Corsa and Metzler at the time.

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post #8 of 20 (permalink) Old 01-19-2018, 07:49 AM Thread Starter
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now that I am armed with all this extra knowledge, I am more confused . Thanks guys. Since I am only doing casual riding it should not make much difference to me
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post #9 of 20 (permalink) Old 01-19-2018, 07:50 AM
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Be wary of using tyre sizes not specified by the manufacturer. It's an easy win for an insurer to deny an accident claim.

I'm sorry but this is simply not true in the UK.


For an insurer to avoid liability it must demonstrate that both the modification was deemed material (and was not disclosed to them) and that it contributed to the incident.


If you fit the wrong speed rating, different story, but a slightly different profile or width matters no a jot (to the insurer).
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post #10 of 20 (permalink) Old 01-19-2018, 07:52 AM
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Oh, have we had this discussion before. There is tire "shape" (round, elliptical, and triangular) and there is tire "profile" (190/55, 120/70, 190/55, 170/65). The two are not really related.

The sidewall height change should not affect the tire's "shape". If you look at a t 190/55 v. 190/50 tire of the same style, i.e. Pirelli Supercorsa, the "shape of the tire from sidewall to sidewall should not be different. Now, spoon a tire meant for a 6" rim onto a 5.5" rim and you will change that shape.

New tires by nature have better tip in feel because their shape has not been altered by road use (i.e. flattened).

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