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RPM · 11-13-2013, 08:25 PM

Hi everyone.

I have two sets of wheels:

Set 1: 15x6J ET +45, 8 Kg a piece.
Set 2: 15x7J ET +40, 5 Kg a piece.

I use set 1 on the street but I wonder if set 2 would provide an FE increase. On one hand they're quite a bit lighter. On the other they're wider, so the tyre contact patch and aerodynamic drag should both increase. Possibly, everything will cancel out and they'll end up being equivalent.

Do think it's worth the expense of swapping tires, rebalancing, etc to find out?

11-13-2013, 08:25 PM	#1 (permalink)
RPM EcoModding Lurker Join Date: Apr 2008 Location: Portugal Posts: 82 JF - '97 Honda Civic 1.5i LS VTEC (EK3) Team Honda 90 day: 59.68 mpg (US) Thanks: 37 Thanked 21 Times in 16 Posts	Wheels: weight vs width Hi everyone. I have two sets of wheels: Set 1: 15x6J ET +45, 8 Kg a piece. Set 2: 15x7J ET +40, 5 Kg a piece. I use set 1 on the street but I wonder if set 2 would provide an FE increase. On one hand they're quite a bit lighter. On the other they're wider, so the tyre contact patch and aerodynamic drag should both increase. Possibly, everything will cancel out and they'll end up being equivalent. Do think it's worth the expense of swapping tires, rebalancing, etc to find out? __________________