just a little more power
Hi all, We have an 2015, F350, 6.2,srw, crew cab, 4x4. We tow a Flagstaff 2020 529RLKS, uvw 9631 lbs. We live in California, so just about anywhere you go, you go over a hill, mountain. I would like ...
Forum Discussion
Grit dog wrote:valhalla360 wrote:
Smaller diameter wheels will help in the sense that they effectively change the gear ratio slightly in your favor (assuming they still have sufficient payload rating)
The difference between 74 and 67 pounds on an 8000lb truck pulling a 12000lb trailer is not going to make any difference.
He was saying 2 different tires the same size weigh close to +/- 70lbs each. Idk what a little 245-75-17 or whatever weighs, but rough guess, little 17" tire/rim combo vs big set of wheels and tires is an easy 20lbs of rotating mass per corner, based on changing many of both.
I good approximation of the effect of rotating mass is about 7:1. Every lb of rotating mass sucks as much power as moving 7lbs of static mass.
Combine gearing efficiency of smaller diameter and effectively 500lbs ish of static mass reduction will help noticeably.
That said, I'd rather have the stability and capacity of larger rims/tires, but certainly not a deal breaker to downsize if searching for a little more snort.
Even if there was a 7-1 ratio, 7lb x 4 tires x 7 = 196 lb on a rig that weighs in at around 20,000lb total.
