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| Tire , Wheel, Brake and Suspension Discussion about the parts of your Viper that hold the road. Sponsored by: The Tire Rack. |
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11-14-2005, 09:32 AM
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#1 |
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VCA Member
Join Date: Mar 2004
Posts: 681
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Speedometer and Changing Wheel/Tires sizes
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? |
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11-14-2005, 09:57 AM
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#2 |
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Site Sponsor / Vendor
Join Date: Sep 2000
Location: 800-428-8355 ext. 362
Posts: 314
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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  |
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11-14-2005, 10:09 AM
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#3 |
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VCA Member
Join Date: Mar 2004
Posts: 681
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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?
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11-14-2005, 11:00 AM
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#4 |
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VCA Member
Join Date: Mar 2004
Posts: 681
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Re: Speedometer and Chaning Wheel/Tires sizes
Thanks for calling me, Luke!
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11-14-2005, 01:02 PM
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#5 |
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Site Sponsor / Vendor
Join Date: Sep 2000
Location: 800-428-8355 ext. 362
Posts: 314
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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
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11-15-2005, 12:32 PM
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#6 |
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NY VCA Member
 
Join Date: May 2005
Location: New York
Posts: 2,287
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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? |
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11-17-2005, 08:56 AM
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#7 |
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SoCal VCA Member
Join Date: Oct 2005
Location: San Diego, California
Posts: 1,507
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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˜ |
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11-22-2005, 09:57 AM
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#8 | |
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Site Sponsor / Vendor
Join Date: Sep 2000
Location: 800-428-8355 ext. 362
Posts: 314
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Re: Speedometer and Chaning Wheel/Tires sizes
Quote:
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