Tire Upgrade

[longbow]

I upgraded my original Integritiy's with the Goodyear Assuarance TripleTred 195/60R 15's and after make a long drive in the rain and light snow I am already a believer. Glued to the road rather that feeling unsure as before.

My question is I seem to be off about 2% in odometer calibration. The Odometer is reading 102 miles for every 100 actually driven. Likewise the Speedometer is reading about 2 mph faster at highway speeds than actual speed. i.e. 67 mph vs 65 mph actual.

Is there any type of setting or calibration that can adjust to the 195 tire size from the 185 for accurate readings?

Thanks!

[Boo]

longbow,

I don't think there's anything you can do about adjusting the calibration of the odometer to account for the different size tire.

Your different size tire should result in a 0.9% over-read compared to the OEM tire size.

One of these days when I'm on a long drive on an interstate with milege markers on the side of the road, I'm going to check my odometer reading against the milege markers.

[longbow]

Originally Posted by Boo

longbow,

I don't think there's anything you can do about adjusting the calibration of the odometer to account for the different size tire.

Your different size tire should result in a 0.9% over-read compared to the OEM tire size.

One of these days when I'm on a long drive on an interstate with milege markers on the side of the road, I'm going to check my odometer reading against the milege markers.

We have a 5 mile stretch of road that has the one mile markers to check your accuracy. I had .2 more on the odometer than the 5 mile mark so 4% higher odometer readings or 4 miles more per hundred. I plan on running this baby into the ground so I am not concerned about the extra odometer reading. I just figured if there was a way to adjust it would be handy.

[Boo]

Originally Posted by longbow

We have a 5 mile stretch of road that has the one mile markers to check your accuracy. I had .2 more on the odometer than the 5 mile mark so 4% higher odometer readings or 4 miles more per hundred. I plan on running this baby into the ground so I am not concerned about the extra odometer reading. I just figured if there was a way to adjust it would be handy.

I thought our odometer only gives whole numbers?

Anyways, almost all of your odometer over-read is due to Toyota's factory setting of the odometer and not your new tire size.

There are international rules for factory odometer settings posted somewhere here on PriusChat. The two bottom line rules I remember are (1) manufacturers are prohibitted from setting odometers to under-read, and (2) manufacturers are allowed to set odometers to over-read by as much as 10%.

[longbow]

Aha! I did not have a chance to check this prior to the new tires.

I do know that the speedometer was affected. It generally reads 2 mph higher than before. Probably not a bad thing. I'll be going slower than it reads so less chance of my sporty red car being pulled over for speeding!

Originally Posted by Boo

I thought our odometer only gives whole numbers?

Anyways, almost all of your odometer over-read is due to Toyota's factory setting of the odometer and not your new tire size.

There are international rules for factory odometer settings posted somewhere here on PriusChat. The two bottom line rules I remember are (1) manufacturers are prohibitted from setting odometers to under-read, and (2) manufacturers are allowed to set odometers to over-read by as much as 10%.

[rpg51]

For what its worth, I think the standard equipment tires are great. But, since I use true snow tires in winter, does anyone have a suggestion for a good "summer" replacement tire. Something with decent treadwear and mileage? Not an all season tire since I use snows in winter.

[gitong]

here, check this out:
http://i2.photobucket.com/albums/y36...g/IMG_4152.png
http://i2.photobucket.com/albums/y36...g/IMG_4149.png
http://i2.photobucket.com/albums/y36...g/IMG_4147.png
http://i2.photobucket.com/albums/y36...g/IMG_4146.png
http://i2.photobucket.com/albums/y36...g/IMG_4145.png

[MacDude]

Lee, et. al.-

Have you had a chance to actually change out the tires on your Touring baby?

I'm looking to replace the stock tires after 30K and wear bars showing. :\

I was hoping Costco would carry some nice ones, but the ones that they have in 195/55R16 are limited. (Only Michelin Pilot Primacy for their current sale)

When I fooled their system by entering my car as a 2007 Mercedes C280, I can look at the 205/55R16 tires and there are more options. But no Hydroedge.

So it was off to Tirerack.com...

Hydroedge is ok, but has mixed reviews there.
Pirelli P4 Four Season look nice
Michelin Pilot Exalto A/S are lower miles, but very highly rated. And they are available at Costco.

So, I'll get those and see how it goes.

[thomastz]

Why are so many preferring 195/60-15 over a 195/65-15? The 65 seems to have a preferable Rev rating. Is there a big mileage difference? Are those who want a larger tire just moving up to the 205/60-15?
I need to replace the Integrities; I am looking for something that is good in wet weather, comfortable and quite.
I am favoring the HydroEdge at this point. Too many conflicting comments about the TT'S.
Thanks for your comments.

[Boo]

Originally Posted by thomastz

Why are so many preferring 195/60-15 over a 195/65-15? The 65 seems to have a preferable Rev rating. Is there a big mileage difference? Are those who want a larger tire just moving up to the 205/60-15?
I need to replace the Integrities; I am looking for something that is good in wet weather, comfortable and quite.
I am favoring the HydroEdge at this point. Too many conflicting comments about the TT'S.
Thanks for your comments.

According to every tire size calculator I've tried, as a replacement for the OEM 185/65/15 tire, the 195/60/15 will have less speedo/odo error (1.0% over-read) than the 195/65/15 (2.1% under-read), e.g.:

Tire size calculator

And the RPMs published by TireRack.com (which should be based on the manufacturers' supplied info) show even less error between the OEM Integrity's 185/65/15 and the TT's 195/60/15. Here's the RPM info for the applicable Integrity, TT, and HE tire sizes:

Integrity 185/65/15: 855 RPMs

TripleTred 195/60/15: 863 RPMs
TripleTred 195/65/15: 836 RPMs

HydroEdge 195/60/15: 867 RPMs
HydroEdge 195/65/15: 842 RPMs

From what I've read, the HydroEdges are a great tire. But the TripleTreds test better according to road tests by Consumer Reports and TireRack.com, and are rated higher by TireRack.com's customers.
However, the HydroEdges do have a longer treadlife warranty (90k vs 80k).

I don't think you can go wrong with either the TTs or the HEs. But there's definitely less speedo/odo error with the 195/60/15 size.

BTW, I think you should expect to get a 2 mpg hit from going with the 195 mm tread width.

Good luck.