Another tire Question
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Senior User
Joined: Aug 2007
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From: Albuquerque, New Mexico
Another tire Question
So I have 315/15/16 I was wondering what it does to my trip meter, odometer, and speedo. If i go 100 miles at 70 am I really going 70 and did I really go 100 miles? Thanks Guys
Travis
Travis
Locomotive breath
Joined: Jan 2006
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From: Mid Oh. Ponderosa
You can check it with some help, get on the interstate and set your speed at 60 mph and have your help clock you as you drive by the mile markers. If your doing 60, then it should be exactly 1 minute.
Hope this helps, Bill
Hope this helps, Bill
Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
i got on the interstate and set my cruise . . . for every mile i travel, my odometer registers .9, so i figure my truck is 10% off. so when i think i travelled 100 miles, it is actually 110, or when i think it was 500, its 550
Senior User
Joined: Jul 2006
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From: Brighton, CO
Divide your new tire diameter by your old one i.e. 35/31=1.129. This means your new tire diameter is about 113% of your old tire, for example. So you will always go 13% faster that your speedo reads, 13% further than your odo says, etc. Just plug in your tire sizes.
Hotshot
Joined: Feb 2007
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From: Sterling Heights,Mi
Originally Posted by JoeTrotter
Divide your new tire diameter by your old one i.e. 35/31=1.129. This means your new tire diameter is about 113% of your old tire, for example. So you will always go 13% faster that your speedo reads, 13% further than your odo says, etc. Just plug in your tire sizes.
I dont know about you guys, but when I first bought my truck, when my speedo said I was doing 55, it was closer to 50
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From: Albuquerque, New Mexico
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From: Brighton, CO
Originally Posted by just another truck
but what if you were not sure how fast you were going in the first place????
I dont know about you guys, but when I first bought my truck, when my speedo said I was doing 55, it was closer to 50
I dont know about you guys, but when I first bought my truck, when my speedo said I was doing 55, it was closer to 50
I suppose it never hurts to measure your actual ride height and program your speedo accordingly, even if you've got stock rubber.
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Originally Posted by just another truck
for me, it was exactly 7%. 100 miles = 107 70=75 60=64.2, ect, Checked with a clock, as well as a radar gun(= ticket), followed up with a GPS.
Fixed with a Hypertech
Fixed with a Hypertech
Junior User
Joined: Nov 2006
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Originally Posted by just another truck
I have the hypertech 3, it allowed me to compensate up to 34.5" tires. I guess it would have to do with what model hypertech?
I really dont want to spend the two hundred for that superlift gizmo either...
Senior User
Joined: Sep 2006
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From: CT
my tires are smaller then stock, and ruffly at 45mph im really doing 40mph according to the gps anyways. but at 80mph on the truck the gps is at like 72mph. so it gets worse as i go faster. i think i have like 245/75/16's .. but R worn down some as well.
Last edited by 2002f2507.3LPS; Nov 16, 2007 at 01:20 PM.
Hotshot
Joined: Feb 2007
Posts: 10,499
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From: Sterling Heights,Mi
Actually, that is right on track, if you do the math, you are getting .88888% of your odometer reading. 40/45=.88888
80x.88888=71.1 something
80x.88888=71.1 something
Last edited by just another truck; Nov 16, 2007 at 01:23 PM.
Postmaster
Joined: Nov 2003
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From: Utah County, UT
My speedo was off about 4 mph, going 75, you'd see 71 on the GPS, so when I put the new dash lay on i set the needle to read what the GPS did, now that I went to 285s my speed is off again. But if you leave it alone and run 285s you'll be pretty much dead on.