Speedometer Discrepency

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Jul 30, 2013 | 09:14 AM

#11

Dan7

Recovery Vehicle

Joined: May 2012

Posts: 863

Likes: 18

I run a stock size 255/55/18 and according to Tire Size Calculator, a 255/65/18 would probably correct for the speed difference I'm seeing between my GPS and the gauge. Wondering if anyone has actuallyl tried correcting via tire size.

Jul 30, 2013 | 09:29 AM

#12

SuperSport

Thread Starter

Pro Wrench

Joined: Dec 2012

Posts: 1,364

Likes: 31

From: Placerville, CA USA

It does work. I've done it by replacing worn out tires back to a stock size. If your calculations are correct, then math dictates that it will work like you want.

E=MC2 and all that...

Jul 30, 2013 | 09:46 AM

#13

Disco Mike

Administrator

Joined: Apr 2006

Posts: 25,707

Likes: 107

From: Denver, Colorado

How far off do you figure your speedo is and when checking with a GPS, how many satelites are you showing, it takes at least 8 of them to get a half way accurate number.