33x12.5xR15 tire questions - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-17-2011
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33x12.5xR15 tire questions

few questions, I got my 3 inch body lift yesterday and I was wondering how 33 ride on freeway's and every day driving? how bad is the gauge off after installing 33's? so my set up is going to be 3 inch Bl with 15 inch rims with 33x12.5 tires.

I have the 1999 Ranger with the v6 4.0 with automatic transmission.
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Old 02-17-2011
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http://www.miata.net/garage/tirecalc.html

Use this to calculate the difference in size and it will tell you the error in the speedo from stock to 33.

285/80/15 is a 33
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Old 02-17-2011
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Hmm, the calculator tells me I'm 50% slow on 33's.

Gears and such make a difference I suppose, and the fact I don't have a stock speedo. I'm in reality only 5mph off according to my GPS.

Good tool though. It beats math. :-P
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Old 02-17-2011
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Depends on what type of tire. AT are less noisy than MT. Always keep your tire pressure in check.

Last edited by Timberwolf; 02-17-2011 at 08:32 AM.
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Old 02-17-2011
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Most of our trucks come from the factory with the speedo already off. When I put 33's on... I actually got closer to what my GPS was telling me I was going. 33's will depend on what gearing you have. If you have 3.73's... it might be kind of slow. I have 4.10's and it's not that bad, but I could tell a slight difference in take off. And yea, noise is determined by the type of tire... AT, MT, etc.
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Old 02-17-2011
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Quote:
Originally Posted by nickskates4lyfe View Post
Hmm, the calculator tells me I'm 50% slow on 33's.

Gears and such make a difference I suppose, and the fact I don't have a stock speedo. I'm in reality only 5mph off according to my GPS.

Good tool though. It beats math. :-P
did you change the stock tire size? difference between the 185/60/14 that it defaults to and a 33 is 44.9% you have to put in factory tire size too...
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Old 02-17-2011
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you should be off by 10% or so. So 60mph on speedo would actually be 66-68mph actual speed.
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Old 02-17-2011
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The larger and wider the tire, the more stress you put on your suspension parts. About 10,000-15,000 miles after I switched from my 33x10.5 to a 33x12.5, is when my ball joints, tie rods and wheel bearings went. It could be coincidental, but I don't think the extra mass of the tire, or the extra surface area helped out. As per mpg, I have only noticed about 0.5-1 mpg loss with the 12.5" vs the 10.5" wide tire.
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Old 02-17-2011
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The switch from 10.50 to 12.50 was probably nothing. Bearings and ball joints in these trucks are crap. The height of a 33" tire is causing more stress than the width.


They ride fine on the freeway/highway. I ran several sets of 33x12.50R15s and always like them. My first set of ball joints went bad in the ranger at 50-60k with stock tires.
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