NTB put on wrong size tires... Need Advice!

Tideland Prius · Jan 24, 2007

<div class='quotetop'>QUOTE(JimboK @ Jan 24 2007, 07:07 AM) [snapback]380021[/snapback]</div>

Thanks. It looks like I mis-interpreted his post. I first read it (probably too hastily) as saying 195s are much safer than 185s, which I question. On the issue of the tire brand and model, I have seen enough on the forums to convince me there's a better tire than the Integrity. "Much safer" may be a stretch, but certainly one that has better bad weather traction, lasts longer, and rides and handles better.

In fact, the Energy MXV4+ is my top candidate at the moment for when I replace my Integritys, probably before next winter. (I have 20K on them now.) Can I assume you're pleased? How many miles do you have on them?
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They're a pretty good set of tyres. We're on our second set in our 02 Camry (OEM tyres). They're quiet and comfortable and good in the dry. They're ok in the wet and snow. We replaced ours at 70ish thousand kilometres. It's a bit short but not too bad. Mileage is pretty good too.

<div class='quotetop'>QUOTE(Beryl Octet @ Jan 24 2007, 09:08 AM) [snapback]380106[/snapback]</div>

Any specific suggestions? I was looking at the MXV4's because of the low rolling resistance, and I had put a set on my previous car and really liked them. I'm not wanting to impact mileage too much, would like better wet handling (I think anything would be a step up from the Integrities), and maybe better dry handling, assuming wet handling and mileage are not traded off.
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Yeah, I think anything is a step up from the Integrity.

hyo silver · Jan 24, 2007

<div class='quotetop'>QUOTE(Allannde @ Jan 23 2007, 09:25 PM) [snapback]379797[/snapback]</div>

...I have never heard of adjustments to the speedometer/odometer to make up for different tire size.
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This feature really shouldn't be all that difficult. It's been available on bicycle computers for many years.

Beryl Octet · Jan 24, 2007

<div class='quotetop'>QUOTE(hyo silver @ Jan 24 2007, 02:00 PM) [snapback]380183[/snapback]</div>

This feature really shouldn't be all that difficult. It's been available on bicycle computers for many years.
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Not difficult at all, probably. But if it were available on cars, don't you think folks who are paying for use of the car by the mile, for example, leasers, would adjust the "size of the tire" setting to minimize the miles driven?

hyo silver · Jan 24, 2007

<div class='quotetop'>QUOTE(Beryl Octet @ Jan 24 2007, 03:18 PM) [snapback]380194[/snapback]</div>

...But...don't you think folks who are paying for use of the car by the mile, for example, leasers, would adjust the "size of the tire" setting to minimize the miles driven?
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That could backfire by risking a few speeding tickets, though, because they'd have no idea of their true speed! Actually, I was thinking the rpm setting could be adjusted by a dealer or tire shop, not the driver. How does Toyota make allowances for different tire sizes in different markets? There must be an adjustment in there somewhere.

Beryl Octet · Jan 24, 2007

<div class='quotetop'>QUOTE(hyo silver @ Jan 24 2007, 02:31 PM) [snapback]380198[/snapback]</div>

That could backfire by risking a few speeding tickets, though, because they'd have no idea of their true speed! Actually, I was thinking the rpm setting could be adjusted by a dealer or tire shop, not the driver. How does Toyota make allowances for different tire sizes in different markets? There must be an adjustment in there somewhere.
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I've seen trucks and cars in the bad old days where a different gear in the transmission that drives the odometer can be installed to allow for different tire size/rear axle gear ratios. I imagine anything very modern probably does this through software, but probably not accessible to the owner, or even guys in a tire store for that matter..

auricchio · Jan 24, 2007

<div class='quotetop'>QUOTE(hyo silver @ Jan 24 2007, 11:31 AM) [snapback]380198[/snapback]</div>

How does Toyota make allowances for different tire sizes in different markets? There must be an adjustment in there somewhere.
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Either the sizes (and therefore revs/mile) are close enough to not need adjustment, or the adjustment is made at the factory.

The tires aren't that much different in different markets.

dmckinstry · Jan 24, 2007

<div class='quotetop'>QUOTE(Allannde @ Jan 23 2007, 05:25 PM) [snapback]379797[/snapback]</div>

That adds a 1.07% error to a similar error which comes from the factory for about a 2% error. In other words at 100 mph indicated you would actually be traveling about 98 mph. At slower speeds the error is less noticable. For example at an indicated 30 mph you are actually traveling at about 29.4 mph.

Is that enough to worry about or is it just a little insurance against a traffic ticket?

Of course when the odometer says 100,000 miles, you will have really travelled only 98,000 miles.

I have never heard of adjustments to the speedometer/odometer to make up for different tire size.
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Interesting. On my car, CAN-View reports about 1 mph less than the speedometer at speeds of 55-65 mph.

I don't go fast enough to get a 2 mph difference, and haven't paid attention a lower speeds.

Dave M.

NTB put on wrong size tires... Need Advice!

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NTB put on wrong size tires... Need Advice!

Tideland Prius Moderator of the North Staff Member

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