Snow tire size
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Mountain Pass
Joined: Jul 2025
Posts: 134
Likes: 59
Snow tire size
Looking to get suggestions for a set of winter tires for my 1966 F 100 Custom Cab long bed.
Currently, the previous owner has 235/70-15 on the front (The 235/70R15 tire has a diameter of approximately 28 inches (711 mm), a tread width of about 9.3 inches (235 mm), and is designed to fit a 15-inch wheel rim. The sidewall height is roughly 6.5 inches (165 mm)
and 255/70-15 on the rear. (The 255/70R15 tire has a diameter of 29.1 inches, a width of 10 inches, and is designed to fit a 15-inch rim. It typically has a sidewall height of about 7 inches )
Truck has been lowered slightly by previous owner, guessing maybe 2-3 inches.
I notice the speedometer shows 2-3 mph slower than actual road speed.
I believe I have a 3.54 rear end gear, if i decoded VIN tag correctly. 3 speed 3.03 transmission.
I have read other posts on stock tire size that suggest to be around 6.70-15 to 7.75-15.
Do I stay with 70 series or move to 75 series. Would 215's or 225's be a good option?
I have looked at so many different tire specs recently, just looking for some guidance on which direction to go. Thanks.
Currently, the previous owner has 235/70-15 on the front (The 235/70R15 tire has a diameter of approximately 28 inches (711 mm), a tread width of about 9.3 inches (235 mm), and is designed to fit a 15-inch wheel rim. The sidewall height is roughly 6.5 inches (165 mm)
and 255/70-15 on the rear. (The 255/70R15 tire has a diameter of 29.1 inches, a width of 10 inches, and is designed to fit a 15-inch rim. It typically has a sidewall height of about 7 inches )
Truck has been lowered slightly by previous owner, guessing maybe 2-3 inches.
I notice the speedometer shows 2-3 mph slower than actual road speed.
I believe I have a 3.54 rear end gear, if i decoded VIN tag correctly. 3 speed 3.03 transmission.
I have read other posts on stock tire size that suggest to be around 6.70-15 to 7.75-15.
Do I stay with 70 series or move to 75 series. Would 215's or 225's be a good option?
I have looked at so many different tire specs recently, just looking for some guidance on which direction to go. Thanks.
More Turbo
Joined: Dec 2019
Posts: 737
Likes: 159
From: Orange County
First thing I'd do is decided what diameter you want on the rears for gearing. If you like the gearing now, i'd stay within 5% of the current diameter. Any more and I think you'll really feel the change. Otherwise, if you want it to pull easier or be snappier off the line, go a little smaller. Or a little taller for lower highway rpms.
I bumped up my other truck tires a little more than 5%, and it feels like a dog to me. Wish I hadn't. But my son drives it now and he doesn't know the difference.
I bumped up my other truck tires a little more than 5%, and it feels like a dog to me. Wish I hadn't. But my son drives it now and he doesn't know the difference.
Cargo Master
Joined: Jan 2016
Posts: 2,672
Likes: 373
I believe a taller and narrower tire is better at clearing water and slush than a shorter and wider tire. Wider tires tend to "float" on water and slush. I like 235/75/15 on a half ton and wouldn't go any shorter or wider for a pickup in the F100 weight range.
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