I use Renthal aluminum rear sprockets and always get 20K+ miles of street and track mileage out of them. Renthal is the only brand of aluminum sprockets I have found that will last. I ran the Renthal aluminum sprockets on my old '99 ZRX1100 (a heavy bike at 520 pounds) and got 20K miles out of them. Renthal makes a light steel countershaft sprocket for the front. They drilled holes in it to lighten it.
I did some endurance racing 7-8 years ago and we used Vortex aluminum sprockets. They were crap.
I don't think there is much of a weight savings with the bi-metal. If you want something that will last and won't break the bank then just get the OEM Sunstar sprockets.
I remember years ago when the bi-metal sprockets first came out there was a brand of them that were out of round. As you turned the rear wheel the chain tension would change. Not good for the chain!
I only use DID 525ZVM-X chain. I have tried EK, RK, Tsubaki, and Regina and couldn't get more that 12-14K miles out of them. I do clean and maintain my chain and sprockets regularly. Rhenthal offers chains but I have not tried them yet.
'04 Blue ZX-10R, FORKS: Race Tech Gold Valves, .85 KG/mm springs, US1 suspension fluid, Shock: Penske 8900 shock w/8760 compression adjuster, Gilles rear sets and levers, Scotts steering damper, Racefit Mega slip on, Zero Gravity screen, ZX636 Master Cylinder, Galfer Superbike braided brake lines, Vesrah SRJL17 pads, Kawasaki seat cowl, undertail kit, Oury Grips, Valentine One radar detector with Legal Speeding heads-up helmet LED.
Last edited by banzai; 03-29-2017 at 04:54 PM.