Hello all, I just wanted to know if an 18 inch wheel weighing 15lbs. will share similar characteristics as a 15 inch wheel weighing the same. 15lbsâ€¦ My situation: I have a 01â€™ GSR show car with IS300 front end conversion, complete NSX sides (into the doors), and S2k tail lights. My doors Iâ€™m sure are heavier than stock, let alone the rest of the body work being metal. To my understanding, a stock GSR weighs in at ~2,650lbs. With all the body work done to it, I have no idea what it weighs now, but for sure I want to lighten it up a little for what Iâ€™m trying to accomplish. (TOP END) Current plans to lighten it up:- Carbon Fiber Rear hatch - Carbon Fiber Hood - FAL glass? windows, side panel window - Sparcos..Brides?? My purpose: Yes it is a show car, but at the same time, I donâ€™t intend to keep a brand new car garaged for 365 days a year. This will be my daily driver and I do want to lighten it up. Iâ€™m a top end kinda guy and that is what Iâ€™m trying to achieve is all top end power. Forced Induction? Yes. Going the whole nine yards with the engine, which in the works as we speak. So the question is: Iâ€™m familiar with physics and know about the whole rotating mass deal; how if the mass is further away from the center, than obviously itâ€™ll require more torque to turn it. But the main point here isâ€¦.does wheel weight and size really have that much of an affect on your performance? â€“ For the situation that Iâ€™m in, going all top end and all, wouldnâ€™t the weight of your wheel & car play less of a role as to if you were launching from a dead stop? Thinking back to high school physicsâ€¦inertia pops up in my headâ€¦.Iâ€™m not too sure if this applies to what Iâ€™m asking, but isnâ€™t it that once an object is moving, itâ€™ll keep going until it is stopped? â€“ In this case, once my car is moving at hwy speeds, because it is already moving, wouldnâ€™t the weight (in general) and the size of your wheel become less important in respect of your performance? Iâ€™ve seen 18â€™s weighing in at only 15lbs. and have also seen some weighing over 28lbs.!!! Thatâ€™s a big differenceâ€¦ - When going top end, wouldnâ€™t you want a wider tire to grip the road? - Would you really want small 15â€™s on your car at those high speeds? - I have yet to see a production â€œsports carâ€ like Corvettes, NSX, Porches, etc...roll off the assembly line with anything smaller than 17â€™s. Obviously to me, there is a reason for it. :unsure: Thanks all in advance and hope to hear back from you all with some good feedback.