Speedometer Is Off With New Tires - Hyundai Forums : Hyundai Forum
 
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#1 Old 09-10-2009, 03:58 PM
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Curious if there is any way to re calibrate the speedometer. I went from 225-70-16 to 225-60-16 cause the tires were brand new and $50. No w the speedo is off though by about 4 at 35mph, 5 at 50mph and 7 at 70mph. Is there anything out there that I can use to recalibrate the speedo or am I just out of luck?
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#2 Old 09-10-2009, 05:54 PM
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I believe the dealer retains the ability to recalibrate the speedometer although I would be warned...your car is now operating on tires for which it was not intended and erratic and/or dangerous handling may result. Your sidewalls are now an inch shorter and the circumference is a full 5.6" shorter than before.

Personally I wouldn't risk something like that to save $200 (I have a set of Continentals for $94 each) but as long as it works for you, all the more power to you.

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#3 Old 09-10-2009, 07:13 PM
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Thumbs down

Yes - the dealer can (for a fee) either do it for you, or send it out (it must be 'certified' in the US).

As for the point on the tires, the above poster *IS* correct in all he states, *IF*, the new size is not a "plus" or "minus" size recognized for the car.

FYI - my wife's Accent uses 16" wheels, but also 14" wheels (with the correct tire size) are OK.

Studying the sizes suggested by TireRack are a great way to see what is 'OK', or 'safe' - as far as a change goes.

The old concept of "if it fits, it works" no longer applies due to ABS, ESC, and the like. You could be putting yourself and any passengers in grave danger at this point.

I do very strongly suggest a call to the dealer (shop) before too many miles in poor driving conditions!

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#4 Old 09-11-2009, 11:41 AM
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I will definitely contact the dealer asap. Though I am not an expert with this I can tell you the ride is quieter and there is no wobble in the sterring wheel which was present before so I believe the old tires were severely out of balance. I will look further into the tire size issues as I have done this on a maxima as well and never had an issue though I was tracking the vehicle. My fiance drives the vehicle and never drives too crazy but it definitely is worth checking as she also drives my daughters around a lot. Thanks for the advice.

Also it was $50 for all the tires together not each. My brother had just replaced tires on his truck and the engine blew so he sold me the tires since he was junking the truck.
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#5 Old 09-11-2009, 02:11 PM
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My primary concern deals with things I do not understand too well, so they make me nervous. (ABS, ESC, etc)

ABS and ESC, etc do rely on tire size as well as many other factors to decide how the systems will react.

Before these types of issues arose, it was mainly an issue of fit, speedo, and load-bearing capacity being high enough for ground clearance.

So, a small tire simply made the speedo 'fast', and you needed to check the weight rating on the tire to confirm it was still enough for the new car. Also, ground clearance and a "twitchy wheel" *might* become an issue.

I too in years past have changed both tires, and tires and wheels on many different cars with no issues.

All that said, on today's cars, I would not touch such a change with a 10FT pole! On my Tucson and Accent, when I bought winter wheels and tires, I made very sure that the "REVs" matched - so there would not be any issue.

I can not say *how* dangerous this might be - only that in my *mind* it *might* be very much so! So hence the "call the dealer ASAP" suggestion.

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#6 Old 09-11-2009, 02:53 PM
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Thanks!
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#7 Old 10-10-2009, 11:19 PM
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So went to the dealer to find out what can be done. They can recalibrate the speedo there for $45.66 and the tires are fit for the weight of the vehicle. Also I was told the ABS and TCS are fine once recalibrated. I am glad it is okay.
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#8 Old 10-13-2009, 02:26 AM
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QUOTE (latinmaxima @ Oct 10 2009, 10:19 PM)
Quote:
So went to the dealer to find out what can be done. They can recalibrate the speedo there for $45.66 and the tires are fit for the weight of the vehicle. Also I was told the ABS and TCS are fine once recalibrated. I am glad it is okay.
Hey, that's interesting. We all learned something.

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#9 Old 10-27-2009, 02:58 AM
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QUOTE (latinmaxima @ Sep 10 2009, 12:58 PM)
Quote:
Curious if there is any way to re calibrate the speedometer. I went from 225-70-16 to 225-60-16 cause the tires were brand new and $50. No w the speedo is off though by about 4 at 35mph, 5 at 50mph and 7 at 70mph. Is there anything out there that I can use to recalibrate the speedo or am I just out of luck?
I talked to my hyundai dealer and another hyundai dealer in town about increasing wheel and tire size and he said that as long as you dont go more the 17" rims your cool after that theyll ride very poopy im planning on getting 17" 5-6 spoke black gloss rims =) cant wait but as for the speedometer def. the dealer im surpised that the speedometer was effected that much i can understand 1-2mph diff over all but wow have you done the math at all for each wheel and tire size and then compare or did you get it checked by someone else i.e a state trooper saying you were going 77 in a 70 zone lol jkjk but wow that curious
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