Re: [ST] Tire Setup Question

[david.funk@xxxxxxxxxxx]

The tire size numbers are not exact. Otherwise why do 190's (or any other size) from different manufactures vary so much. Your calculations are right, but the input data is very suspect.

The hard to find part about 190/55's is why I have not tried one.

David W. Funk

-------------- Original message -------------- 
From: "Masiak, Richard" <Richard_Masiak@xxxxxxxxxxxxxxxx> 

> Aspect ratio is (H/W)*100. So if I know the width is 190mm and the ratio is 55 
> then the H=(W*55)/100 right? 
> 
> If that's right then the H on the 190/55 is 104.5mm and the H on the 190/50 is 
> 95mm. 
> 
> I checked most of the tire manufacturer sizes on a variety of sites and they 
> don't carry the 190/55. It seems to be a non-standard (harder to get) size. 
> 
> -----Original Message----- 
> From: st-bounces@xxxxxxxxxxxxxxxxxxxx 
> [mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx]On Behalf Of 
> david.funk@xxxxxxxxxxx 
> Sent: Monday, July 31, 2006 11:40 AM 
> To: ST@xxxxxxxxxxxxxx 
> Subject: Re: [ST] Tire Setup Question 
> 
> 
> My uninformed opinion is "not exactly". 
> If you just calculated the 9.5mm, the real tire could be a lot different. So try 
> very hard to measure a real 190/50 and 190/55 on the same size rim. 
> 
> I doubt the 190/50 would "throw the setup out of whack" enough to cause a 
> "problem". But the /55 should have a quicker, may be even smoother turn in. I 
> would expect the /50 to to un-improve the bike. 
> 
> The lose of almost 5mm in rear ride height will slow the stearing. I think the 
> ride height change will have a bigger effect then the tire profile change. If 
> you correct the ride height for the /50, you will still turn in slower. 
> 
> Why change? 
> I have been thinking of trying a 190/55 someday. The 6" rim on on '00 Sprint is 
> a bit large for the 180/55 I always run. But I do not really have any interest 
> in a 190/50, because of the slower stearing. 
> 
> The above opinion is worth at least half of what it costs. 
> 
> David W. Funk 
> '00 Sprint ST 
> Pleasanton, CA 
> 
> 
> -------------- Original message -------------- 
> From: "Masiak, Richard" 
> 
> > Me and a guy at work were discussing the ZX-10R. The fact that it has Ohlins 
> > suspension (stock) and others don't. I read a review that Kawasaki played 
> games 
> > to make the bike handle better and went with a 190/55ZR17 rear tire. Most 
> > others have a 180/55 or a 190/50. 
> > 
> > I ran the math and if I were to put a 190/50 on instead, the rear is 9.5mm 
> > shorter in height than using the stock size of 190/55. Is 9.5mm a big enough 
> > different to throw the setup (street) out of whack? 
> > 
> > Just a question. We don't need to make this a drawn out thread. 
> > 
> > Rich 
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