Here was some math I did to justify new wheels. I actually saved weight buying new wheels with the offset I wanted VS. putting spacers on the OEM Sport RAYS.
Stock Setup
19x9 Front: Rim 23.2lbs With tire/stock 52.2lbs
19x10 Rear: Rim 23.9lbs with tire/stock 56.8lbs
Z1 spacers weigh 16LBS for all four.
56.2LBS each front wheel x 2 = 112.4LBS
60.8LBS each rear wheel x 2 = 121.6LBS
From Forgestars Data Testing on Website
19x9 Front: Rim 25.5lbs With tire/stock 54.5lbs
19x11 Rear: Rim 25.7lbs with tire/stock 58.6lbs
54.5LBS each front wheel x 2 = 109LBS
58.6LBS each rear wheel x 2 = 117LBS
Front difference: 3.4 LBS
Rear difference: 4.6 LBS
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2009 Nismo 370Z and 1975 Datsun 280Z 2+2 - PNW_INC - Legacy_Ohana
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