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Wheel and tire weight
We are heading into winter here so I recently switched back to snow tires on steel rims from thin summer tires on alloy rims. I weighed the wheel and tire combinations on a digital bathroom scale and got a rough average weight for each set. The summer tire on the alloy rim was about 36.2 pounds each for a total of 144.8 pounds for all four. The worn winter tire and rim weighed 40.2 pounds each or 160.8 pounds for all four. That is only a difference of 16 pounds of unsprung/rotating weight. I really expected to see more of a difference. I always feel like the car rides more stiffly and seems to accelerate slower with the heavier wheels. Interesting.
I have new studded tires on steel rims that I will use during the worst of winter and brand new LRR tires in the shed waiting to be mounted. I purchased those before COVID hit the US but I am driving much less so I made it through the summer on the old Goodyears. Next spring I will get them mounted and report back on any change in mpg.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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Last edited by COcyclist; 04-09-2021 at 10:13 AM..
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