Tire question
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Junior User
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Tire question
Buying new tires soon. Truck is a 1990 regular cab 4x4. Has 235/85-16 tires on it now. I can get an amazing deal on 4 new 225/75-16 tires.
My question is is this a good size for this truck? Anyone run this size before? Will they look goofy because they are so much shorter?
Thanks
My question is is this a good size for this truck? Anyone run this size before? Will they look goofy because they are so much shorter?
Thanks
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Junior User
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The new tires are treadwright puma at. Guy I know bought some and never mounted them, and is practically giving them to me.
On the treadwright site they show their 225/75-16 as having a wider tread than their 235/85-16.
I guess I'm not really worried about looks, as the truck is a beater anyhow, but I don't want it to look like a clown car.
On the treadwright site they show their 225/75-16 as having a wider tread than their 235/85-16.
I guess I'm not really worried about looks, as the truck is a beater anyhow, but I don't want it to look like a clown car.
Logistics Pro
Joined: Sep 2007
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From: Western Mass
Look up P-metric tire sizing.
225 is the tread width in millimeters.
75 is the ratio of sidewall to tread width. That means the sidewall is 75% of the tread width 225*.75 = 168.75mm
16 refers to the rim size in inches
Putting sidewall (x2) and rim size together, thats about a 29.3" tall tire. (after converting from metric to inches)
235/85-16 would equate to about 31.7" tall, about 2.5 inches taller, and 10mm (.39 inch) wider.
225 is the tread width in millimeters.
75 is the ratio of sidewall to tread width. That means the sidewall is 75% of the tread width 225*.75 = 168.75mm
16 refers to the rim size in inches
Putting sidewall (x2) and rim size together, thats about a 29.3" tall tire. (after converting from metric to inches)
235/85-16 would equate to about 31.7" tall, about 2.5 inches taller, and 10mm (.39 inch) wider.
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If you are currently running 235/85R16's with a 5 speed, your cruising RPM at 65 MPH should be around 2260. With the shorter tires, your RPM's will now be about 2440 at the same speed.
Also keep in mind that your speedo is going to be off now too. These aren't the worst things in the world, just something to keep in mind. If for some reason you have higher gears, say 3.55's, you may really like having the shorter tires.
If it seems like you are getting better MPG with the new tires, you may be... however, remember that your speedo and ODO will be running 8% fast.
Also keep in mind that your speedo is going to be off now too. These aren't the worst things in the world, just something to keep in mind. If for some reason you have higher gears, say 3.55's, you may really like having the shorter tires.
If it seems like you are getting better MPG with the new tires, you may be... however, remember that your speedo and ODO will be running 8% fast.
Post Fiend
Joined: Feb 2009
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From: Ottawa, Ontario
It will make the truck look abit goofy on top of making you run at higher RPM's for the same speed, however if you're getting these tires for next to nothing, who cares, run them if you're in need of tires.
Logistics Pro
Joined: Sep 2007
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From: Western Mass
However, your post did make me laugh! Unless you're running monster tires, there is plenty of space in the wheel well, and smaller tires.. yah..!
Fleet Owner
Joined: Jul 2006
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From: Mi'kma'ki
that's what im running on my dually with 3.55 gearing.here's why:
LT 225/75/R16 (29.3X8.9)
w/Speedometer Recalibrated to 1065 conversion constant
Lowered Truck: 1.2" (primary objective for easier loading bed)
Effective Gear Ratio Change: 3.84:1 (secondary objective for better hauling performance)
they don't look too bad.definitely not your monster truck tire though.
you'll like 'em.they help with performance.
i contemplated stock drw size.the 215's.would have been around 3.73's with the 3.55's but i really had to set her down best i could cus this stuff doesn't just load itself.
the fuel economy would have been better with the slightly skinnier 215 and a little taller for keeping gearing up a tad,but my back said i should go as low as i can.there's always a compromise.pro's and cons with everything.
if i had the 4.10 ring and pinion,then i would had stuck with 215's.even though i do drive pretty slow.you'd have to press the skinny going downhill,if you gear 'em down too low.
^
besides lifting hurts economy,this is why i can't swap in a d60.i can't afford the lift in the rear to match the extra front height.already wish the truck sat 6" to a foot lower in the rear when loading and i'm over 6'.
thankfully i finally recently got a dump trailer for the larger stuff,but still always will be tossing stuff up into the dump bed of course as well.towing a trailer when you know your load will fit in the bed is cheaper on fuel to leave the trailer home.compromises.so many compromises.
LT 225/75/R16 (29.3X8.9)
w/Speedometer Recalibrated to 1065 conversion constant
Lowered Truck: 1.2" (primary objective for easier loading bed)
Effective Gear Ratio Change: 3.84:1 (secondary objective for better hauling performance)
they don't look too bad.definitely not your monster truck tire though.
you'll like 'em.they help with performance.
i contemplated stock drw size.the 215's.would have been around 3.73's with the 3.55's but i really had to set her down best i could cus this stuff doesn't just load itself.
the fuel economy would have been better with the slightly skinnier 215 and a little taller for keeping gearing up a tad,but my back said i should go as low as i can.there's always a compromise.pro's and cons with everything.
if i had the 4.10 ring and pinion,then i would had stuck with 215's.even though i do drive pretty slow.you'd have to press the skinny going downhill,if you gear 'em down too low.
^
besides lifting hurts economy,this is why i can't swap in a d60.i can't afford the lift in the rear to match the extra front height.already wish the truck sat 6" to a foot lower in the rear when loading and i'm over 6'.
thankfully i finally recently got a dump trailer for the larger stuff,but still always will be tossing stuff up into the dump bed of course as well.towing a trailer when you know your load will fit in the bed is cheaper on fuel to leave the trailer home.compromises.so many compromises.