Changed 17" tire sizes, now my speedometer is WAY out of whack!

[Stewthebassman]

So in the interests of saving money I kept my 17" stock SXT wheels but I changed my tires from the stock size to 225/50R17.

The car handles great, I couldn't be happier.

But now my car runs at 6mph (10km/h) over what my GPS tells me.

I went to the dealer and the Technician didn't have that size in his computer, so that was a bust. He set it to the "nearest size" but it is the same, maybe a bit worse! He said if that didn't work he'd have to mess with the "Bios" or something like that.

I really don't want to spend more time at the dealer on this, but I guess I will have to, because my mileage is racking up at an unnatural pace....and will until I switch to my snow tires (stock size) in October!

Any ideas, anyone? Surely I can't be the only LX'er who is experiencing this!

[mexi]

preditor

[Stewthebassman]

Thanks but I'd prefer to do it without spending $400


Anyone else?

[mexi]

there is only stock tire size options you can choose from with the star scan . diablo is your only option.

[Stewthebassman]

Really?

Argh, okay.....I guess I should have thought of that before I did the switch....

Oh well....by the time I'm finished with the car the mileage won't really matter!!

Thanks!

[MatFab]

could just buy the right size tires... might be less than 400

[Magnum375 Jr]

Well, just constantly use the GPS for Speed reference....and don't mind the speedo.

[Stewthebassman]

could just buy the right size tires... might be less than 400

Well, I just paid $650 for these terrific General UHP tires....no going back now!

[Stewthebassman]

Well, just constantly use the GPS for Speed reference....and don't mind the speedo.

Yeah, that's what I'm doing....although I know that anything the speedo says I just deduct ten, lol...

I was just worried about the odometer racking up more miles than I'm really driving, but that will just stay that way until I switch back to my winters.....

[Magnum375 Jr]

oh...my bad...missed that part....well to be honest....how long do you plan on keeping the car, and how many extra miles a week does it put on? It may not be that bad if you think about it.

[Stewthebassman]

It's basically 10% out of whack, so if I do 120 kilometres, the odo will say I did 132.

I plan to keep the car until spring at least....and so really if my error only adds 10% to my mileage for another 48 days at 100 kms a day then it will only add another 500 kms until I put the correct tire size back on.....

No biggie I guess!!

[Magnum375 Jr]

I think that is minimal, for everyone else reading the post 500km is equal to about 311 Miles....So i think you should be alright...I don't think that in a year it would equate to too much on your milage.

[Stewthebassman]