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Discussion Starter #1
My stock lx rim are 15 inch tire size 195/65r15. And my new rim 17 inch with tire size 215/35r17 . My speedometer now read more faster than my correct speed. When my car run 50mph so speedometer show 55mph , when I run 45 and speedometer will show 49mph. How to fix this ?


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You should go to 215/45/r17 not 215/35/r17 otherwise take it to a shop and they have to re calibrate you speedometer which i belive theu can not sure tho

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Or just remember the differences. It really doesn't matter what the speedo says, as long as you know how fast you're going.

35 sidewalls? I hope you have smoooooth roads where you are.
 

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i know to subtract about 2mph when i drive with 40 series tires

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according to my gps, my speedometer's been 1 mph off since i got new wheels..doesn't bother me :p
 

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My stock lx rim are 15 inch tire size 195/65r15. And my new rim 17 inch with tire size 215/35r17 . My speedometer now read more faster than my correct speed. When my car run 50mph so speedometer show 55mph , when I run 45 and speedometer will show 49mph. How to fix this ?


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I don't think wheel/tires size will throw off you MPH rating. The speedo uses a calibration of internal gearing and the speed the gears are moving, not the wheel.

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I don't think wheel/tires size will throw ofaster returning a faster than MPH rating. The speedo uses a calibration of internal gearing and the speed the gears are moving, not the wheel.

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And a smaller diameter than stock tire will make those gears turn faster in return giving an incorrect speedo reading.
 

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Sucks your speedometer reads low instead of high. I'll agree with the previously-mentioned solutions: 1. get different tires, 2. remember to add 6mph (just to be safe), or 3. take it somewhere to get the speedometer recalibrated. Good luck!
 

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Discussion Starter #11
I'm bring to dealer then they said that they can't fix it lol.
I know tire size should be 215/45r17 but I choose 215/35r17 because I can lower my car 1 more inch and this tire light weight only 17lb . Lol maybe I wait until this tire gone then change to 215/45r17.

Stock : 15 inch rim 16lb and tire is 18 lb
New: 17 inch rim 14lb and tire 17lb


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2. remember to add 6mph (just to be safe),
6 mph only works at a certain speed because the difference is a percentage. The faster you go, the greater the difference between the speedo and the actual.
 

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@2B20SI
No...Using internal gearing wouldn't tell you your speed because technically the wheel is another gear that motion is transferred to. Tire diameter will throw off your car's MPH reading. And if it could use internal gearing it would show you MPH even in neutral.
 

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6 mph only works at a certain speed because the difference is a percentage. The faster you go, the greater the difference between the speedo and the actual.
Agreed. But at 50mph, there is not much need to go much faster (maybe up to 65-70?). The greater percentage of going faster than 50mph would only translate to an additional 1-4mph (maybe) over the 5mph the speedometer already reads low. So, to solve that, the OP should either get different tires, or get the speedometer fixed.
 

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