Speedo recalibrate?

[Cardsfan]

What are you guys who are running larger tires doing? Hypertech, rough county, edge cts? Just wanna get some ideas.

 

 

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[swathdiver]

7 minutes ago, Cardsfan said:

 

What are you guys who are running larger tires doing? Hypertech, rough county, edge cts? Just wanna get some ideas.

 

 

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BlackBear, free updates as part of the tune.  Someone just listed an AutoCal for sale on this site too.  

[kylant]

did nothing to mine. went from the factory 275/65-20s to 295/65-20s. 1" bigger. 

my speedo is dead accurate now according to GPS and roadside radar. with factory tires my speedo was reading fast. GM was getting out of warranty faster than they should have

[CT Chevy Connoisseur]

18x9 and 275's to 20x10 and 35's - minimal impact on speedo based on roadside radar checks and Waze app.  Not worth the expense to calibrate IMO

[RugbyRef]

Installing lift and wheel/tire combo in about a week.  Going to 37's from stock.  Just bought a  Hypertech In-line Speedo Calibrator.  I have used these before on previous rigs and they have always been accurate.

Edited April 16, 2021 by RugbyRef

[Grumpy Bear]

On 4/4/2021 at 4:45 PM, kylant said:

did nothing to mine. went from the factory 275/65-20s to 295/65-20s. 1" bigger. 

my speedo is dead accurate now according to GPS and roadside radar. with factory tires my speedo was reading fast. GM was getting out of warranty faster than they should have

Mine got 'right' with a fractionally shorter tire.  

[Cardsfan]

did nothing to mine. went from the factory 275/65-20s to 295/65-20s. 1" bigger. 
my speedo is dead accurate now according to GPS and roadside radar. with factory tires my speedo was reading fast. GM was getting out of warranty faster than they should have [emoji35]

Well, I’m going from the factory 275/65-20 to 37/13.50-22. I’m thinking the speedo might be a “tad” bit off.


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