IBELEAF wrote:I have doubts that shaving off 40 pounds will have any noticeable benefit which is 0.02% weight difference from the overall car weight, but the wheels do look nice.
You cannot group sprung and unsprung (rotating inertial) masses into the same category for looking at it from an efficiency standpoint. Inertia directly effects the torque required to get a wheel moving; the power required to get the car moving. Dropping the inertia for each wheel can help with this. If someone cruises on the freeway all the time then there is less of a gain to be had. I am mainly a city driver, and do experience stop and go traffic daily, so each restart will require less power to get the car accelerated to speed, therefore, will help a little with range. The same can also be said for why you would not want to go with the same weight in a larger diameter wheel. The majority of the mass is in the rim and moving it outwards from the axle centerline only increases the inertia of that particular wheel over a smaller diameter one. I am expecting a 5-8% gain in efficiency/range, which is not a lot, but every little bit helps.
And like greenleaf said, it will be difficult to put an exact value on the gain. I will just look at range trends over time to see a shift from the consistent numbers I have been seeing with the car.
My LEAF rolled over 3000 miles exactly as I was pulling it in my shop to pull the wheels to get them swapped over... that was kind of cool.
And thanks, the look is another benefit.