I am thinking on getting these rims but I do not want to loose any gas mpg due to weight issues ect or have to adjust anything. I think the stock tires will fit on this but it says these rims are 16.3 lbs each.... how much do the stock ones weigh? Hopefully it will not require spacers or anything either... not sure.

 

Stock xa wheel was exactly 17lbs on my scale. xb would be a little more.

 

As long as you stay with the original tire width, you probably won't notice any milage change. Even if you do go up a bit in width, you still probably won't notice a difference in milage. I run a 205/50/16 and get the same milage as my 185/65/15s.

 

the new rims are 2 in wider but 16.3 lbs

 

hey man we just got our scion xB RS30, and it came with 17" rims @ 215/40/R17 think i'll have any gas mileage difference? is there a way to figure this out? a formula or whatnot

 

The 215/40/17 tire has nearly the same diameter as the standard xB rim. The rims and tires I'm putting on mine are 20lbs for the rim and 20 lbs for the tire. I need to weigh the stock wheels once they're off. I look forward to the stability of high performance tires versus the numb, unsafe feeling of the Goodyears.

 

yes, I do notice that the xB is nice n stable around turns with those tires on. when we test drove the stock xB's we didn't like how the car felt through turns.