Alright so I feel really dumb asking this but - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 06-08-2008, 09:15 AM Thread Starter
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Alright so I feel really dumb asking this but

Im buying new wheels for the truck 20x10s 8x170mm(?) and looking to wrap them in 37" nitto terra grapplers and I never learned how to read the stupid things just always did the 37x13.50 deal, so im guessing 355/60/20 Load "D" O/D 36.8 is what im looking for??

TOTALED
08 Super Cab F250 4x4:
Performance: No Cat/DPF, Spartan 275, MBRP, aFe, Snow Performance, NX, Farmboy Fab, Spearco, SunCoast, Autometer, Mag-Hytec, Fox Shocks, CCV Mod
Looks: Rize Quad Link & Steering Stabalizer, KMC, Nitto Terra, Herculined Rocker Panels, AVIC Z2
---
For sale
96 12V Reg. cab Long bed auto, BHAF, CFM, KDP killed, 0 plate, DDP4, HTT 64/71/14, ATS Exh. Manifold. Waiting to install 7" mitre single stack 60# springs 4kGSK.
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post #2 of 6 Old 06-08-2008, 09:42 AM
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try this Tire Size Converter

my name is jeff but my friends call me.........jeff



2003 f-250 6.0 lariat, crew cab, long bed,fx4

Autometer guages
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4inch turbo back
s&b intake
Pro comp
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Dual shocks
toyo 37's
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post #3 of 6 Old 06-08-2008, 10:14 AM
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Or if you feel like calculating it yourself, use the following formula;
Width x Ratio = Section Height
Section Height x 2 = Total Section Height
Total Section Height + Wheel Diameter = Tire Diameter
So, for a 325/65R18 tire, you would do the following,
325 * .65 = 211.25 mm
211.25 * 2 = 422.5mm
422.5 + (18*25.4) = 879.7/25.4 = 34.63"
Remember, convert your wheel diameter to mm by multiplying by 25.4 and convert the total mm back to inches by dividing by 25.4 which you can see I've done in the formula above.

Shaun

'08 F250 6.4L Lariat 4x4 CC/SRW fully loaded, special ordered
6" Fabtech 2.25 dual shock lift w/18" AR wheels, 35" Toyo AT's
Avic-Z2 Nav/Stereo w/iPod, Bluetooth, XM NavTraffic
(2) Rear headrest mnt DVD entertainment systems
Line-X bedliner
Banks CAI, Dual Exhaust, Six-Gun, Speed Brake & iQ (test vehicle)
Bushwacker Fender Flares
Ravelco Anti Theft Device

Quote:
Originally Posted by Rick Santorum
We went into a recession in 2008 because of gasoline prices.
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post #4 of 6 Old 06-08-2008, 05:22 PM Thread Starter
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Question

355/60/20 Load "D" O/D 36.8

Now im assuming O/D is outside diameter, and i know they round up so those are 37s, which im looking for, but the 355/60/20 im guessing the 20 would be 20" wheels (sorry thinking out loud), the 355 breaks down to 14"? and the 60 8.4"? So 14" across and 8" from wheel lip to top of rubber?? So these would be ideal, right>

TOTALED
08 Super Cab F250 4x4:
Performance: No Cat/DPF, Spartan 275, MBRP, aFe, Snow Performance, NX, Farmboy Fab, Spearco, SunCoast, Autometer, Mag-Hytec, Fox Shocks, CCV Mod
Looks: Rize Quad Link & Steering Stabalizer, KMC, Nitto Terra, Herculined Rocker Panels, AVIC Z2
---
For sale
96 12V Reg. cab Long bed auto, BHAF, CFM, KDP killed, 0 plate, DDP4, HTT 64/71/14, ATS Exh. Manifold. Waiting to install 7" mitre single stack 60# springs 4kGSK.
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post #5 of 6 Old 06-08-2008, 05:30 PM
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I put 8 ply (load range d)tires on my truck and I never will again. I don't know how much hauling you do but I would seriously look at 10 ply tires (load range e) Just my

Eric@Powerstroke.org

Early 99 F250 with a bunch of extra junk...
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post #6 of 6 Old 06-08-2008, 08:26 PM
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Quote:
Originally Posted by Goolsbymd View Post
355/60/20 Load "D" O/D 36.8

Now im assuming O/D is outside diameter, and i know they round up so those are 37s, which im looking for, but the 355/60/20 im guessing the 20 would be 20" wheels (sorry thinking out loud), the 355 breaks down to 14"? and the 60 8.4"? So 14" across and 8" from wheel lip to top of rubber?? So these would be ideal, right>
If what your looking for is 37's, then yes, those would be ideal. The 355 represents the tires overall width, the 60 represents the height of the tire from rim to tire tread as a percentage of the width of the tire, so 60% of 355 (13.97in) is 213 (8.38in) from rim to tire tread. Multiply that by 2 because you have a bottom section and a top section then add the wheel diameter (20in) which gives you a total of 934 (36.77in). Which makes it a 37in tire that is 14in wide at it's widest point.

Shaun

'08 F250 6.4L Lariat 4x4 CC/SRW fully loaded, special ordered
6" Fabtech 2.25 dual shock lift w/18" AR wheels, 35" Toyo AT's
Avic-Z2 Nav/Stereo w/iPod, Bluetooth, XM NavTraffic
(2) Rear headrest mnt DVD entertainment systems
Line-X bedliner
Banks CAI, Dual Exhaust, Six-Gun, Speed Brake & iQ (test vehicle)
Bushwacker Fender Flares
Ravelco Anti Theft Device

Quote:
Originally Posted by Rick Santorum
We went into a recession in 2008 because of gasoline prices.
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