Speedometer questions??? Help

Wanting to buy 265 75 16 to replace 265 70 16, wondering what computer I need to get to recalibrate my speedometer??

 

265 75 are 31.64" diameter, and 265 70 are 30.60" diameter. Given that the factory wheels make the speedo lag behind (in my experience), I think you'll be OK. I'd like to see what others have to say, though. It's 22 less revolutions per mile.

 

Speedo should read 2 miles slower, which will probably be just right.

 

Almost everyone reports truly accurate readings once they bump to that size. Before the switch my speedometer was reading about 3 mph faster compared to my GPS. Now it's spot on.

 

Yep 265/75/16 made mine accurate as well. Check your speed with GPS yours probably off right now.

 

Had 245/75/16 stock tires and went with 265/75/16 and the speedometer is perfect, otherwise 2 mph slow.

 

Yeah my speedo was faster by 2mph. Put the new rims and shoes on voila it was perfect!

 

Thanks everyone for the replays, putting bfg km2 soon.

 

I have the same thing to report with my stock 07 TRD sport 17" wheels.

Speedometer was reading 3 mph or so higher than GPS (or those roadside radar billboards.)

Replace the stock size 265/65/17 tires with 265/70/17 and now it is dead on the money.

And better yet, the prices on the 70s are generally lower in my area apparently due to supply and demand.