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#1
03-05-2007, 08:25 PM
Hummer Veteran
Join Date: Jun 2003
Location: South Carolina
Posts: 204
Question about speed reading with new tires
I am wanting to get a set of 37x12.50x17 bf all terains so to keep the stock look but give me a little more tire. Does anyone know how bad this will affect the speedometer? and if so how much will i be off? Any help will be appreciated.
#2
03-05-2007, 08:45 PM
Hummer Guru
Join Date: Jan 2004
Posts: 7,060
Re: Question about speed reading with new tires
Quote:
Originally Posted by prplprowlr
I am wanting to get a set of 37x12.50x17 bf all terains so to keep the stock look but give me a little more tire. Does anyone know how bad this will affect the speedometer? and if so how much will i be off? Any help will be appreciated.
The faster you go, the more it's off.
I thought it was around 7 mph at 75mph. just buy a Superchips programmer or Hypertech. you'll want to redo your shift points anyhow wwith the larger tires.
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#3
03-05-2007, 11:31 PM
Hummer Guru
Join Date: Jul 2005
Location: Idaho
Posts: 4,744
Re: Question about speed reading with new tires
Also, take it for a spin with a good GPS unit, and compare. Sometimes, they are slightly off from the factory and larger tires will bring it in line.
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#4
03-06-2007, 12:42 AM
Hummer Professional
Join Date: Aug 2006
Location: Dallas, TX
Posts: 398
Re: Question about speed reading with new tires
37/35 = 1.057 = 5.7% off
Ie. At 10 miles an hour, you will be traveling 10.57
At 100 mph, you will be traveling at 105.7 mph....
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