Speedometer and Changing Wheel/Tires sizes

[Vipera Russelli]

How much would the speedo be off if you put 20" all the way around on a Gen III? Or 19" in the front and 20" in the rear on a Gen III?

Anyone know where to get a speedo calibration certificate in Northern VA?

 

[Luke@tirerack]

Re: Speedometer and Chaning Wheel/Tires sizes

providing you keep the proper overall tire diameter there would be no difference

this picture explains it very well

You must be registered for see images attach

 

[Vipera Russelli]

Re: Speedometer and Chaning Wheel/Tires sizes

Thanks Luke. I should have been more specific. Some folks here are filling up their wheel wells with larger wheels AND larger tires. I've done a search and can't seem to find what size tires these guys are using, but let's assume we're switching to 19" in front and 20" in the rear and using the same tire side wall as stock, so as to fill up the wheel wells while maintaining the stock rake. How much would you expect the speedometer to be off actual speed with this set up?

 

[Vipera Russelli]

Re: Speedometer and Chaning Wheel/Tires sizes

Thanks for calling me, Luke!

 

[Luke@tirerack]

Re: Speedometer and Chaning Wheel/Tires sizes

the rear SRT10 tire is 27.4" tall which is about 5% off of what you are loosing ..... so when your speedo says 105 mph you are only going 100 mph

 

[Nader]

Re: Speedometer and Chaning Wheel/Tires sizes

I am interested to know whether the height of a 345/25/20 Pirelli is tall than the 27.4" stock tire height.

Luke do you know?

 

[Blue Batmobile]

Re: Speedometer and Chaning Wheel/Tires sizes

Isnt therev a website you can punch in your wheel and tire size and see the equivalent on upsizing? I know I've seen it before.

Bat˜

 

[Luke@tirerack]

Re: Speedometer and Chaning Wheel/Tires sizes

the height of a 345/25/20 Pirelli

26.8" diameter