the blur
Full Access Member
My speedometer reads 3% under. My GPS unit is dead accurate. Truck is at the dealer now getting the cluster replaced. 100 MPH, it reads 97 !!
2014 Speedometer off
- Thread starter the blur
- Start date
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Really? I would think there's a general "give" in a couple miles either way... At "normal" speeds say where the speed limit it 55, you're talking about maybe being 1-2 mph off.
Not a big deal IMO...
Not a big deal IMO...
the blur
Full Access Member
There is absolutely no reason in this day & age an analog speedometer should not be 100% accurate.
AZSCTACO
Full Access Member
What size tires are you running right now??
the blur
Full Access Member
New factory size Bridgestones. 20"
AZSCTACO
Full Access Member
So 275/55/20?? Are those the original wheels/tire size that came with the truck? Or did you buy them from someone?
AZSCTACO
Full Access Member
The reason I'm asking is because the 265/65/17 tires/wheels that came on some of our trucks is a different diameter than the 275/55/20....approximately 4% off difference.
the blur
Full Access Member
Original wheels, and the tires I just put on, are exact duplicates of factory OEM.
Erik G
Full Access Member
so, when your tires are half warn, and it reads 3% too fast, are you going back to the dealer for a new cluster?
3% is pretty good. They actually usually read a little fast as a margin of error
3% is pretty good. They actually usually read a little fast as a margin of error
the blur
Full Access Member
Mine is reading under 3%. The GM tolerance is 5% according to the dealer, but I can't get it in writing from a GM spec sheet. Only the word of the service manager.
