A 9lb rotor is pretty light, in reality. I think the rear vented rotors on my EVO are like 14-15 pounds and even the 2-piece aluminum hat aftermarket ones with thin wall rotors get it down to only ~11. The 1/4" thick drag rotors with aluminum hats are around 8 pounds for the EVO. They are larger in diameter of course. 17x8.5 Kosei K4R + 215/45/17 Hankook R-S3 = 38 pounds I'll be going up to the 245/40/17 range after these wear out. Either RS-3s or if something comes out that is faster... Edit: Just did some research and some part design and even using an aluminum hat, the rotor is still going to be 8 pounds, although it would be 11.44" in diameter instead of 10.7". There aren't many off-the-shelf rotors under 11". Going scalloped and drilled would drop another pound and a half. Full on 1/4" scalloped drag brakes you could probably get down to 5.5 pounds. I wouldn't be looking for drag brakes though. Just something with stock like capacity but lighter and at that point, it's going to be maybe 2 pounds lighter. There is some weight savings to be had by going to a fixed mount 2-pot billet aluminum caliper for the brakes and floating single pot billet aluminum hydraulic E-brake caliper, eliminating the drum E-brake items. In total, I think you could drop about 7.5 pounds a corner and maintain the stock braking capabilities. Might even be slightly better due to better airflow with the two piece hat setup and the larger diameter. Lots of work and expense for 15 pounds, but it is unsprung. Rotational inertia would probably be about equal due to the larger diameter. Last edited by mike156; 02-17-2013 at 10:27 PM. |