hey, I got a 89 chevy 3/4 ton that has stock 245/75/16 I want to move up to 265/75/16 tires. Am i going to lose mpg and will that small of a difference cuase braking gear problems?
going up in tire size
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Keep the stock tire size. First off, example, your speedo might say 65mph and you might really be doing 69 with that taller tire. Trust me, this alone is not worth it. No one but you will give a hoot about its stance with wide tires. With the taller (and heavier) tires gearing will change and slow the truck down i.e. 0-60. Fuel mileage will go down due to more rolling resistance.
If you want to upsize without screwing up anything major like the speedo or having to change gearing.... P255/70R16. That's a size that is about the same diameter as the tires currently on your truck. 265/75R16 is about an inch or 2 taller.
Whoops. Well. the 265s are slightly taller (not enough to worry) and the 255s are slightly shorter (again, not enough to worry).quote:
Originally posted by Eiron:
According to this Tire Size Calculator the 265/70-16s are the closest size match to your 245/75-16s. Tire Rack came up with 44 models of truck tires in that size.
Just out of curiosity, why do you want to change sizes?
According to this Tire Size Calculator the 265/70-16s are the closest size match to your 245/75-16s. Tire Rack came up with 44 models of truck tires in that size.
Just out of curiosity, why do you want to change sizes?
Just out of curiosity, why do you want to change sizes?
The reason i want to change size is for ground clearance and look.
mostly ground clearance though.
mostly ground clearance though.
The 265/75's will be 3.9% bigger. So when your speedo reads 65mph you'll actually be going 68mph.
265/70's are only 0.5% bigger, so they wouldn't give you much extra clearance.
You'll lose a little mileage on the wider tires, but gain a little by making the gearing a little taller. Probably not enough either way to be of concern.
There will be no significant effect to braking, and the you'll probably be 0.1 or 0.2 seconds slower on your 0-60 time, which is probably over 10 seconds anyway.
265/70's are only 0.5% bigger, so they wouldn't give you much extra clearance.
You'll lose a little mileage on the wider tires, but gain a little by making the gearing a little taller. Probably not enough either way to be of concern.
There will be no significant effect to braking, and the you'll probably be 0.1 or 0.2 seconds slower on your 0-60 time, which is probably over 10 seconds anyway.
Don't forget going to a larger diameter tire will cause alignment problems, figure a 4 wheel if it's possible or at least a two wheel alignment into the cost picture. Sometimes the alignment can't be done without buying some aftermarket parts due to the stock parts not willing to fit the larger wheels and tires, which can add more to the big picture. Just some food for thought! Good luck and let us know what you decide and how it all went.
Explain. I have slightly bigger tire...I've never heard this one before.quote:
Originally posted by Steel Blue Wind Rider:
Don't forget going to a larger diameter tire will cause alignment problems, figure a 4 wheel if it's possible or at least a two wheel alignment into the cost picture. Sometimes the alignment can't be done without buying some aftermarket parts due to the stock parts not willing to fit the larger wheels and tires, which can add more to the big picture. Just some food for thought! Good luck and let us know what you decide and how it all went.
If true, I'd think it only applies to drastic changes in tire size. I've never heard of alignment issues when upsizing. Probably not a bad idea to get an alignment with new tires anyway though.
Too bad I've put 20K miles on the Yokos. The Jeep has a natural tendency to wear to the outside on soft compound tires and its just magnified. At 10K miles, I had my tire shop unmount them and remount them so the part that had lots of tread could get some exposure. It seems to be working quite well. I'll probably get another 15K out of them. My dad knows we messed up by not getting an alighment.
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