When I was looking for aftermarket 20 inch wheels, I couldn't find too much info on the topic. So, I decided to post this thread. I went to the Wheel Warehouse in Anaheim, CA after doing some online searches. These guys are great. They have a great selection of both affordable and custom forged rims. Devin, one of the sales associates, was very familiar with the Model S as he had worked on multiple Model S's prior to mine. Initially, he had encouraged me to get 22" rims. But, I wanted to change the look of the car and improve the handling while not sacrificing the efficiency too much. I felt like a 20 inch wheel was a good compromise. I eventually chose the TSW Nurburgring. They looked pretty good to me and I appreciated their weight. The 20 x 9 front wheel weighs 23.3 lbs and the 20 x 10 rear wheel weighs about 24.5 lbs. The offset was 35 mm for both. The tires I chose were the Hankook Ventus V12 evo K110 sized 245/40/20 F and 275/35/20 R. Both tires have about a 27.7 inch diameter which is the same as the stock 19" Goodyears I had. The tires are a little heavy, 28 and 30 lbs respectively but the combined wheel/tire weight (51.3 lbs, 54.4 lbs) is a little less than the stock wheel/tire combo (57 lbs). Wheel Warehouse took the TPMS off the stock rims and placed them on the aftermarket rims without any problems. This is a staggered setup so I won't be able to rotate my tires but can switch them around. I'm very happy with the handling now. The car feels a lot more buttoned down. The handling is more crisp. The wider rear tires give me excellent traction out of corners and the wheels line up a lot better with the fenders. As far as efficiency, I was getting about 300 Wh/mi with the stock setup. After 600 miles on the aftermarket rims, I'm getting about 310 Wh/mi. Not bad in my book. I drive about 50/50 in the city/freeway at about 40-60 mph city, 70-80 freeways. By the way, I will be selling my stock rims soon I think.