Is it worth it?
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Elder User
Joined: May 2003
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Is it worth it?
I had a front blow out on my Firestones the other day so I had to put the spare on which has never touched ground. I decided it was time for the 285's so before I went and bought them I measured the 265 on the front. The static loaded radius of the 285's is a 1/4" higher, {15-1/4" to 15-1/2"} and the on truck diameter is .800 taller with the 285's. My question is, is it worth the $98-$102 {dealer quotes} to get the speedometer adjusted? Do they put in a generic number for the revolution's per mile or do they actually measure by chalking the distance to figure actual circumference? The tire manufacture for my 285's says 628 rev's per mile. Does anybody know what the number is in the computer for the factory 265's?
Thanks, Antelope V-10
Thanks, Antelope V-10
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From: Near DC
I agree with all above.
With 265's at 30 mph I show 1.3 mph faster, at 70 I show 2.2 mph faster.
285's will do fine.
That should ease your mind, keep your money, the stealer already has enough.
With 265's at 30 mph I show 1.3 mph faster, at 70 I show 2.2 mph faster.
285's will do fine.
That should ease your mind, keep your money, the stealer already has enough.
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This may be obvious, but before you spend the money on recalibrating, maybe you could use (borrow) a handheld GPS to measure your speed and compare it to your speedometer. Like the fella said, maybe it will be spot on with the 285's.
It's up to you whether to correct any difference, but personally, I wouldn't worry much about whether I was going 70 or 72. Or if I had 100,000 miles or 103,000 miles on my truck. I guess you don't want to be speeding, though. But in the grand scheme of life, knowing our exact speed is really not that important (to me)
It's up to you whether to correct any difference, but personally, I wouldn't worry much about whether I was going 70 or 72. Or if I had 100,000 miles or 103,000 miles on my truck. I guess you don't want to be speeding, though. But in the grand scheme of life, knowing our exact speed is really not that important (to me)
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