04-26-2013, 02:22 AM
0
I went to bryant automotive by me and his guys remounted the tires on the replacement rims, they are pretty cool about doing whatever I needed done they just charge more then most places in the area for it. It didn't really matter in this case since DTD said they would reimburse me for any costs in inspecting and remounting and balancing the tires to the new rims. Luckily it did the trick and the only thing I feel now is the not completely smooth ride because of the aggressive tread of the tires which I expected.
As far as diameter differences and such, I used a calculator on the f150 forums before I bought these tires and rims in January. The oem tire and rim for my model was the 20" rim that was 8.5 wide the tires were 275/55/20. I dropped to an 18 inch rim same width and tire size is now 275/70/18 calculator said diameter increase of 3.76%. So at 100 mph what my speedometer showed would be 3.76 mph less then my true speed. On average my speedometer is only 1-2 mph less then my true speed since I dont drive around town at 70 mph lol.
As far as diameter differences and such, I used a calculator on the f150 forums before I bought these tires and rims in January. The oem tire and rim for my model was the 20" rim that was 8.5 wide the tires were 275/55/20. I dropped to an 18 inch rim same width and tire size is now 275/70/18 calculator said diameter increase of 3.76%. So at 100 mph what my speedometer showed would be 3.76 mph less then my true speed. On average my speedometer is only 1-2 mph less then my true speed since I dont drive around town at 70 mph lol.
