I've tried to look on almost every website, but can't find a comparison chart. I have 16x8 Rims and would like to know what that size would be in that metric format. For example 285/75/16. Thanks again for so much help off these boards.

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2000 Work Series 4.2L v6, 3.08 Gears
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35x12.50's are pretty equal to 315/75...
33x12.50's are pretty equal to 305/75
285/75 are pretty damn close to 33's...maybe 32.5?

 

i havent seen a 305/75/16 (who makes it cause i am interested before...305/70/16 i know are there

285/75/16 is 32.8 inches
295/75/16 is 33.4 inches
and i believe the 33x12.5 range between 32.4 and upwards

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Things to come: coil spacers, 4.10 gears, Grill
ilmagill@aol.com For Pictures :
www.geocities.com/ilmagill

 

ProComp makes a 305/70R16 in a mud terrain and an all-terrain...which they list at 33x12.50.

 

I HAVE THE 305/70R16 PROCOMP MUDD ON MY TRUCK.


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1999 F150 REG.CAB BLACK 2WD SPORT 4.2 LITER V6

• FLOWMASTER SERIES 40 DUAL EXHUAST
• K&N Filter Injection Performance Kit
• MANIKS GRILLE GUARD
• PIONEER DEH-P4000 CD PLAYER
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• SPIDERGEAR BED WEB
• PROCOMP HEADLIGHT & TAILLIGHT BLACKOUTS
• 1.75 INCH COIL SPACERS(gave me 3 inches of overall lift).
• 3 INCH BODY LIFT
• 33x12.50R16(305/70r16) PROCOMP MUDDERS
• 16x8 AMERICAN RACING BAJA RIMS
• RAM AIR(home made)
• HELLWIG REAR ANTI-SWAYBAR
• ENERGY SUSPENSION FRONT ANTI-SWAY BAR BUSHINGS
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• 4 100w stainless KC-Hilites

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[This message has been edited by JDm (edited 11-18-2000).]

 

Split,

Here is how to figure out the metric format. Using your numbers 285/75/16.
285 = width in milimeters
75 = aspect ratio in percentage
16 = rim size

1. Take the width (285) and divide by 25.4 (this converts to inches)
2.Multiply the result from step 1 by the decimal equivalent of the aspect ratio (.75 in this case)
3.Multiply the result in step 2 by 2. The aspect ratio gives you the side wall height. Since there are two side of the tire above and below the rim (when measuring from the ground up) you need to multiply by 2.
4.Finally add the result from step 3 to the rim size (16 inches in this case)

So you get 285/25.4 = 11.22" wide
11.22 * .75 = 8.415"
8.415 * 2 = 16.83"
16.83 + 16 = 32.83" tall

I hope that isn't too confusing. I went through the same thing to see if I could get a metric version that was the same as the 35/12.5 that I have now

JC


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2000 F150 XLT Supercab 5.4L
35" BFGs 16.5" Weld Outbacks
3" Fabtech suspension lift
3" body lift
Stull Billet grill

 

How do those ProComps ride and handle? Are they noisey? How about off-road?

--Sean

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Happy Off-Roading!
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