Quote:
Originally Posted by mcrews
Trucks are normally geared for mpg on the stock tire. so going TOO tall can be counter productive.
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I'd say commercial vehicles tend to be geared low so they can deal with a hefty load, the heavier the rating you go for the lower the gearing will be. Even something as small as my Renault will pull a light load in 5th at 21mph (~3250rpm at 60). Load it up to GCM though and you'll appreciate the low ratios.