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Re: Why yes, I do use this forum for everything...
ihifi #165454 04/16/07 12:23 AM
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Ken.C Offline OP
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Hmm. I wonder how much 6 mm will change the speeds and odometer. I do tend to be somewhat precise about such things, and I have been known to use the odometer to tell when to get gas. Extensively.

That does leave the question of how to tell this guy to get lost (or at least that his prices are crazy high...)

OTOH, supporting local businesses is (almost) always a good thing.


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Re: Why yes, I do use this forum for everything...
Ken.C #165455 04/16/07 12:43 AM
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After 21+ years in the auto dealership parts business, (6 years of that, at a Honda dealership) my opinion is: do yourself a big favor, and put on the factory spec. tires.......trust me, you will open a "can of worms"...otherwise.

Last edited by LT61; 04/16/07 12:55 AM.

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Re: Why yes, I do use this forum for everything...
Ken.C #165456 04/16/07 12:53 AM
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One of the tire's will have a diameter that is 381mm (15 inches) + 114mm + 114mm = 609mm and the other tire will have a diameter that is 381mm (15 inches) + 120.25mm + 120.25mm = 621.5mm. The difference in diameters will be 12.5mm. Since circumference is Pi X diameter, the difference in circumference is 12.5 x 3.14 = 39.25mm. This will make a roughly 2% difference. So if you are going at 55 mph, your speedometer will show 56.1mph.


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Re: Why yes, I do use this forum for everything...
Ken.C #165457 04/16/07 12:59 AM
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The 190/60s will have a diameter of 23.97" while the 185/60s will have a diameter of 24.47". The circumferences will both be pi*diameter but the ratio will be the same -- 23.97/24.45 or about 2% difference. I think this is within the variation you get from one brand to another for the same tire size so probably a non-issue, but having said that some dealers *are* funny about the impact of tire size changes on warranty claims. Not sure where you stand on warranty; car may be just old enough to be outside warranty anyways.

Lower profile tires will also tend to handle a tiny bit better (because the sidewalls don't flex as much) and ride a bit rougher (because the sidewalls don't flex as much ).

The tire guy is probably telling the truth that the circumference is close enough not to matter, but on a family car I would go for the 185/65s over 190/60s even so.

EDIT -- this tire circumference discussion is funny to me, since I drive a vehicle (2003 Jeep TJ Rubicon) which was designed for one tire size then fitted with smaller tires just before launch on the advice of the legal folks, so speedometer and odometer are both off by about 4%.

Last edited by bridgman; 04/16/07 01:03 AM.

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Re: Why yes, I do use this forum for everything...
Ken.C #165458 04/16/07 01:22 AM
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Ken, it looks like you got pretty good advice from the guy. The Kumho appears to have a pretty good performance/price ratio . I assume the Solus was the one he was referring to(except it's 195, not 190, of course). The wider tread and narrower sidewall tend to offset, but the 195/60 is about 24.2" in diameter and the 185/65 about 24.4". The difference in diameter isn't very significant and if at 60 on the speedo now you're actually doing 59(typical), you'd be doing about 58.5 on 195/60.

Generally(other factors remaining equal)the wider tire will handle a bit better and ride a little stiffer. This is practically no change at all from OE; there's a lot more radical stuff done I see on the Miata forum. Get the 195/60 Kumho Solus.


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Re: Why yes, I do use this forum for everything...
Ken.C #165459 04/16/07 01:39 AM
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I believe HR tires are rated for 130 MPH sustained.

The old Civics never used to go that fast.


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Re: Why yes, I do use this forum for everything...
bridgman #165460 04/16/07 02:23 AM
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Yeah John, but my tires are rated 149 mph and I was only able to do 130. Just another example of manufacturers exaggerating, I suppose, but I'm considering a lawsuit against Michelin.


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Re: Why yes, I do use this forum for everything...
JohnK #165461 04/16/07 03:30 AM
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Ken.C Offline OP
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I've got Z rated (155+) tires on my Volvo 850 Turbo wagon. Can't say I've bested 100 more than once or twice... O' course, that thing rides like it's on rails. Scratch that... like it's running over rails over and over and over again...


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Re: Why yes, I do use this forum for everything...
Ken.C #165462 04/16/07 12:16 PM
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There's your problem right there. You're suppose to travel parallel to the rails.

Re: Why yes, I do use this forum for everything...
Ken.C #165463 04/16/07 12:22 PM
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Another vote for Tire Rack, and a vote for National Tire and Battery (NTB). My local NTB will price-match anything on Tire Rack, so I do my research online and then get the tires from NTB. I feel a little dirty for not directly supporting Tire Rack, but if you buy tires from NTB then you get lifetime rotations for free. Plus they are always having other specials.

As to tire size, I once got wider tires on my old Subaru and the upgrade in handling was impressive. Gas mileage suffered, though. Then when they wore out and I went back to the original size, it felt a little bit like I was on bicycle tires at first ...


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