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riviera2454
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PostSubject: Tire Size Question   Tue Oct 14, 2008 7:43 pm

Not riv related but I am wondering if I have 285s/75/r15s on my truck was size is it when changed in to like 30x9.5?
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T Riley
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PostSubject: Re: Tire Size Question   Tue Oct 14, 2008 8:08 pm

riviera2454 wrote:
Not riv related but I am wondering if I have 285s/75/r15s on my truck was size is it when changed in to like 30x9.5?


idk we had like 315/75?/16's on our 3/4 ton suburban and those were like 31 inches tall or so when i measured them
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Mr.Riviera
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PostSubject: Re: Tire Size Question   Tue Oct 14, 2008 8:59 pm

285's are around 11". not saying the rim is that big, it depend on how much it is bulging over.
285/75/15 works out to be 31.83 in diameter, and about a 8.5-9" rim width.

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vendetta
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PostSubject: Re: Tire Size Question   Tue Oct 14, 2008 9:15 pm

I have 275/35/18's on my firebird.... smile
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ewolfe0050
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PostSubject: Re: Tire Size Question   Tue Oct 14, 2008 9:20 pm

Quote :
Not riv related but I am wondering if I have 285s/75/r15s on my truck was size is it when changed in to like 30x9.5?

My buddy is running 275/65/17 on his trunk and the tires are 31" in di. I think the 275/65 referres to sidewall to footprint ratio so a 275/35 would be different height than the 275/65. I would check some of the tire websites to find out exactly how to measure.

BTY... I just put 33x12.5x15s on my Bronco today. HUGE improvement! Looks and stability...
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Mr.Riviera
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PostSubject: Re: Tire Size Question   Tue Oct 14, 2008 9:43 pm

first # - width of tire tread in mm
second # - percentage of the first # that determines the sidewall height
last #- the rim total diameter

if you want 30in total diameter then convert back to mm. (762mm) then subtract the wheel size (15in=381mm). take 1/2 of that you get 190.5mm. that is the sidewall size you need. now depending on how wide you want the tire to be you could have a 275/70R15 or 285/65R15 or 295/65R15. (295*65%=191mm)

all of those will change the total diam. to ~30in. which would mess up your speedo if the factory tire/rim combo has a different diameter.

hope that helps, i see i didnt really answer your question earlier b/c i didnt fully understand what you were asking for.

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1996 with 244k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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