I didn't know the originals were 70 series, but for comparison purposes it is
good to know that they were 21" tall.
>From 21" to 22.76" is about 8% reduction in final drive ratio, which slows
>down engine rpm's, etc. Theoretically it would have a small increase in fuel
>mileage and a small decrease in acceleration.
I was able to find 165/70 tires, those might be a better choice than 155/80.
The 165/70 tires should be 22.1" tall, an increase of 5% over 145/70.
> Is anyone concerned about tire diameter (height) and what that does to
> your final drive ratio? The original 145 70 tires are 21" tall. The
> common replacement 155 80 tires are 22.76" tall, thus "slowing down "
> your final drive ratio. Does anyone have any gut feel on what this does?
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