Changing from Chevy car tires to Chevy truck tires. (braking, ABS, best)
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Our Chevy pickup uses 205-75-15 inch tires. We want to remove all 4 and replace with 205-70-15 inch tires from a Chevy car. Any issues since the "difference" is 3% and according to this warning you do want to stay within 3% and 205-75-15 is 3% smaller in diameter than 205-70-15.
Also, when this site says there could be braking issues, what braking issues for a tire more than 3% larger or smaller than the originals?
I'm assuming you want to save some money by swapping these tires out but you may end up saving your life. I would think you could do the swap but I would seek help from a reputable tire shop and ask their advice. You are changing the aspect ratio so it might throw off your speedometer and odometer but not by much and the tire will need to turn quicker because it is shorter than hte "75" another non issue.
I don't think braking will be an issue but once again I would consult the pros.
But, when travelling in a car with say 13 or 14 inch tires that came with the new vehicle, and travelling in a pickup with the original 16 inch tires, it is doubtful the ones driving their car on smaller tires = faster revolution, are less safe than the ones riding in their truck on large 16 inch tires.
well one Issue between passenger car tires and LT (Light Truck) rated tires is LT rated tires are build for the extra weight/load(s) of a Full-Size PU truck while car tires are not rated for 1/2-ton+ weight and will mess with the manufactures tow/haul ratings.
Changing from a LT tire to a car tire actually can be dangerous if you load up your truck with underrated tires and have a blow out at highway speeds
It's mostly CYA BS. And what potential there is for break failure doesn't apply when going smaller.
Larger diameter tires = more torque on the hub = more braking required. I might be concerned if you were going from stock tires up to 36" tires, much less so when going from, say, a 70 to a 75. And not at all in your situation, going from a 75 to a 70.
Also, staggered tire sizes - that is, taller tires on the back than on the front - on modern cars that weren't engineered from the factory to have staggered tires could throw your ABS sensors into a tizzy.
You shouldn't have any issues doing what you want to do at all.
We have a good price on a set of 205-70-15. The tires are new.
Last week we went to a shop for a spare. The only used one they had was a 205-60-R15. We sat that tire beside the existing tires and you could really see the smaller height (diameter).
Then yesterday we saw the same truck but it was a 4WD and the tires looked rather large. A closer look and that pickup, same as ours had 31x10.50-15LT.
They looked pretty large for a 15 inch rim. You might think you'd be safer if closer to the ground which would be the case in a 75R15 going down to 70R15.
Whether a 31x10.50-R15LT is like a 225 or 235 R15 not sure.
well one Issue between passenger car tires and LT (Light Truck) rated tires is LT rated tires are build for the extra weight/load(s) of a Full-Size PU truck while car tires are not rated for 1/2-ton+ weight and will mess with the manufactures tow/haul ratings.
Changing from a LT tire to a car tire actually can be dangerous if you load up your truck with underrated tires and have a blow out at highway speeds
That is true, however for example my 2002 F-150 didn't come with an LT spec tire when new. The O.E. tire from the factory was a Goodyear Wrangler RT/S highway all season tire.
We have a good price on a set of 205-70-15. The tires are new.
Last week we went to a shop for a spare. The only used one they had was a 205-60-R15. We sat that tire beside the existing tires and you could really see the smaller height (diameter).
Then yesterday we saw the same truck but it was a 4WD and the tires looked rather large. A closer look and that pickup, same as ours had 31x10.50-15LT.
They looked pretty large for a 15 inch rim. You might think you'd be safer if closer to the ground which would be the case in a 75R15 going down to 70R15.
Whether a 31x10.50-R15LT is like a 225 or 235 R15 not sure.
If by "like" you mean the same size, no. The 31x10.50 is 31" tall by 10.5" wide. The 235 is 235 mm wide. Height is determined by the other number as a percentage of the width (a 235-75 would have a sidewall height of 176.25 mm - 75% of 235) plus the rim height. The tallest 15" tire identified with a metric measurement is the 235-75R15 at ~29" tall, after that they're identified using English measurements.
Probably lying more info that you wanted, but there you go.
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