Ford Focus Forum, Ford Focus ST Forum - View Single Post - Lightweight 17" Wheels
View Single Post
Old 12-26-2012, 10:19 AM   #6
Focus Enthusiast
Join Date: Apr 2012
Fan#: 97393
Location: n/a, United States
What I Drive: 2012 Focus SE

Posts: 277
Points 147, Level 2
Points: 147, Level: 2 Points: 147, Level: 2 Points: 147, Level: 2
Level Up 94% Completed
Level up: 94% Level up: 94% Level up: 94%
Forum Activity 3%
Activity: 3% Activity: 3% Activity: 3%
FF Reputation: 5 jsr72 Good Standing Member
Buy-Sell-Trade Rating: (0)
Originally Posted by Slo86GT View Post

So it's more like driving without an adult male in the passenger seat everywhere you go.
No, not x4. Removing 1 lb of wheel weight would be like removing 1.3-1.4 lbs of equivalent mass, per wheel. Doing that for all four wheels, using say 1.38lbs x 4 = 5.5 lbs.

Here's a nifty calculator that does a decent job of estimating rotating inertia for wheels and tires.

The Effects of Rotational Inertia on Automotive Acceleration
jsr72 is offline  
    Reply With Quote