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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 03-21-2011, 09:11 AM
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IowanStraight6 IowanStraight6 is offline
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Question 237/75/15 vs 9.5x30/15???

ok thinlin about new tires on the 96 f150 (STOCK HEIGHT) and read that the 9.5 wont rub on lock but how much bigger are they anyone with pics?? how much would my speedometer and gear ratio be off (3.55 now) and how much should my milage drop also i pull car trailer regularly will i notice a losse in power??
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94 f150 2wd,
E40D 300I6, reg cab 8' bed, Tow Pac. project
You rarely use 1st unless you start on a hill with some a-hole trying to check your prostate with his prius. Unlike ricers we can't get parts at Walmart ...
Then Ford blew it totally with the 10th gen and it never got better since.
96 f150 4wd, 4R70W 302V8, super cab 8' bed, Tow Pac. daily driver
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Old 03-21-2011, 09:33 AM
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Conanski Conanski is offline
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The 30x9.5 tires are about an inch taller than 235s, that will make the speedo read 2-3mph slower and it will hurt power a little but not a whole lot. See my Album for pics of my truck with 30's on it.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 03-21-2011, 02:07 PM
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you notice much on power
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Nick
94 f150 2wd,
E40D 300I6, reg cab 8' bed, Tow Pac. project
You rarely use 1st unless you start on a hill with some a-hole trying to check your prostate with his prius. Unlike ricers we can't get parts at Walmart ...
Then Ford blew it totally with the 10th gen and it never got better since.
96 f150 4wd, 4R70W 302V8, super cab 8' bed, Tow Pac. daily driver
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Old 03-21-2011, 04:37 PM
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Sgt Neutron Sgt Neutron is offline
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Plug in your tire sizes into this calculator and it'll give you a bunch of comparisions:

Tire Size Calculator - tire & wheel plus sizing
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Old 03-21-2011, 05:09 PM
homesplat homesplat is offline
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How would a change in tire size reduce power? and also on that tire calculating site the guy before me posted it says that changing the tire diameter by more than 3% could result in brake failure.. why?
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Old 03-21-2011, 09:37 PM
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Tires are part of the driveline and tire size factors into your final drive ratio. Without changing anything else the larger the tire the higher(numerically lower) your final drive ratio is. As an example if your truck has 3.55 gears going from stock to 30" tires changes the effective final drive ratio to 3.28, 31's makes it 3.18, 33's make it 3.0, 35's make it 2.82.

The tire size change won't affect engine HP but the taller gearing will make it seem like it lost power, it actually does reduce the amount of torque reaching the ground so acceleration will be slower.

The brake failure warning is a bit overblown but larger tires do put more leverage on the brake components and it will make them less effective.. though like everything else the amount of braking power lost is proportional to how much larger than stock the tires are. In the big scheme of things you probably won't notice much difference.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 03-21-2011, 09:37 PM
 
 
 
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