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While at randy's ring and pinion site I used the rpm calc they have on there.
Whould it be better to park the truck on concrete and measure from the center of the hub down and double it for the tire size? It just seems tires are smaller than labeled.
Its very common for tires to be listed at a certain size but really be shorter...many 38's run 36.8 to 37.5 inches tall...some even run less than the 36.8 height...
Dont ask me how they get away with that...
Yes, it would be more accurate to use two times the static loaded radius as your tire diameter in rpm/gear ratio calculations. Make sure the tires are inflated to the pressure that you plan to run them.
Rim width etc has an effect on the height... but yeah, Interco in particular is known for running short.
Boondockster, good post-- that is excellent advice.
Yeah, Interco sucks. Poor quality, poor design and horribly over priced for what you get.
Easy now. Their designs work. I'll get some 47" LTB's sometime I think. Stickier than Michelins, and those stupid-ass Claws too.
Yes, boondocker is spot on. Tire growth at speed is something folks not in the realm of M715s should consider, but we're pretty much immune from that.Quote:
Originally Posted by tacoma
most things that operate at highway speeds are, I'd say. :)
Funny you mention that bump_r! I almost added a caveat for centrifugal force but realized it's not an issue for most M715's :)
Either way, it is better than using the number on the sidewall.
Thanks Tacoma! I'm new here and I'll try to be a good poster.
LOL good tech is VERY welcome here. :)
To stay off topic, I run 13x38x16 Super Swamper TSLs on my 1949 Dodge Power Wagon, which is fairly similar to a M715. No rubbing at all. The rear end is welded and the front is open, the truck will climb straight up a barn wall without a winch, the only limitation is the carb getting off kilter and flooding. I will agree that Swampers are poor on the street, although if you get them siped, they grip well, but you still have noise and flat spotting. Anyway, I LOVE THE SWAMPERS OFF ROAD. I have run 9.00x16 NDTS, and Gama Goat NDTs, with and without chains and 1100R16 XL michelins, and I like these Swampers better than all of them. Another plus is I used my stock wheels, tubes and flaps. I run the rears at 12 psi and the fronts at 38 psi, so I can steer! In heavy stuff, the fronts go down to about 15 psi. Just to recap, I really, really like my swampers off-road. :beerchug:
Dave