tire size Vs gearing
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More Turbo
Joined: Jun 2001
Posts: 572
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tire size Vs gearing
I have a 88 F-150 with a 300 motor. I am about to buy new tires. The size that is called for is 235/75/15. I would like to get a wider tire. when i talked to the sales rep about it he said that in order to get a wider tire that I would have to also get a taller tire. He said that it would be about an inch taller. how much would this extra inch affect my gear ratio. I currently have 3.55 gears. I occasionally use the truck to haul loads and I am worried that this will hurt my performance. what do yall think.
also what would the next larger size tire be?
also what would the next larger size tire be?
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
tire size Vs gearing
Your 235 tire i think it about 29" tall. You could step up to a 31 by 10.5 wide tire which will fit...or even a 32 by 11.5 inch tire, but it might be hard to clear a 32. With either tire, you will not see a power problem with 3.55s. I have 32s on 3.55s and it works fine.
Primary rig is:
95' F-150 EB 300/6 5 spd with 4" Superlift, MSD, Ram Air, Gibson Exhaust, 32" BFG Muds
NEW PICS IN MY GALLERY!! :-)
Then theres:
88' F-250 Superduty 351 + c6
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 and a
3 spd column shifter. Top speed, 65mph, Go Baby Go!
The newest addition to the Ford family is a 99' Mustang GT 4.6L
Primary rig is:
95' F-150 EB 300/6 5 spd with 4" Superlift, MSD, Ram Air, Gibson Exhaust, 32" BFG Muds
NEW PICS IN MY GALLERY!! :-)
Then theres:
88' F-250 Superduty 351 + c6
95' Mercury Cougar 4.6L V-8
80' E-350 300/6 and a
3 spd column shifter. Top speed, 65mph, Go Baby Go!
The newest addition to the Ford family is a 99' Mustang GT 4.6L
Thread Starter
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More Turbo
Joined: Jun 2001
Posts: 572
Likes: 1
tire size Vs gearing
I measured my tires today and best I can tell, they are a little over 28 inces tall and about 9 inches wide. what would be the next size up from theese tires be? how big ,or wide, can I go with these rims.
Elder User
Joined: Sep 2000
Posts: 718
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From: Golden ,CO USA
tire size Vs gearing
the next size up would be 30x9.5x15. but personaly i would go with a 31x10.5x15. it makes the truck look better i had 31s on my 89 and it looked pretty good and could 4 wheel pretty good. i think it puts the speedometer off by 5 miles and hour at 65 mph.if you still want your speedometer to read accuratly, just call or go to your local ford dealer and tell them u put bigger tires on your truck and you want a new speedometer gear to compensate for the larger tires.
'75 F-100 4x4, 4" lift
16x38.5x15 super swamper TSL
mini-spooled 9" rear end
390 w/ cam,headers,
and 4 barrell edelbrock
TRIED TRUE and FORD BLUE
'75 F-100 4x4, 4" lift
16x38.5x15 super swamper TSL
mini-spooled 9" rear end
390 w/ cam,headers,
and 4 barrell edelbrock
TRIED TRUE and FORD BLUE
