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11-03-2007, 10:37 PM
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#1 |
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It's the air up here
Join Date: Mar 2007
Location: Western Colorado
Posts: 710
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Actual tire height
My BFG Muds measure only about 34inch, but they are listed as 35inch. We should know the actual height of our tires before considering gear change ect.. The calculators out there that allow us to find our final gear ratio with tires is a nice thing, but if we plug in an incorrect tire size like 35 instead of 34 it changes things a bit. How much actual difference is there in other tire makers? Are they all within an inch or so? Or are some much more, or right on the money?
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1971 cheyenne k10 4 speed np 205 454 BB factory a/c  Never drink down stream of the herd! Eric |
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11-04-2007, 07:09 AM
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#2 |
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Registered User
 
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 2,038
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Re: Actual tire height
yeah, they are kind of deceiving. for gearing calculations it's best to use the tire's static load height. measure from your axle center to the ground with the vehicle level and multiply by 2. from what i've experienced there are variations between companys but most are within +/- one inch.
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Steve 1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's |
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11-04-2007, 09:30 AM
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#3 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: Actual tire height
Yeah,they vary.I measured my wife`s 10.50/31 BFG A/Ts and compared to a 12.50/33 Kelley Safari AWR and the BFG was taller.A 285/75 SuperSwamper SSR was taller,too,and the BFG was a tad shorter.
Gear ratios are based on a 26" tire.So all our trucks are running taller ratios than we think.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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11-04-2007, 10:51 AM
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#4 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: Actual tire height
My 35" Super Swamper SSR's measure right about 34". I hear the Parnell Jones are pretty close to advertised specs but seems most of the Super Swampers are smaller than advertised.
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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