http://www.motosport.com/motorcycle/product/BIKE-MASTER-TUBELESS-VALVE-STEM-CHROME/?psreferrer=http%253A%252F%252Fwww.nextag.com%252Fchrome-valve-stem%252Fstores-html%253F&catalogId=110472&segment=badger-street
http://www.heeters.com/tires.shtml
http://www.prestigewheel.com/RetailValveStems.asp
just a few sites i found for motorcycle valve stems. be careful i asked for metal stems on my last tire change and the guy talked me out of it said more times than not they leak
08 zx14se Brocks CT Duals, Brocks street map, Driven 16/43 sprockets,EK ZZZ Chain,MRA Windscreen, Roaring Toyz Diamond Cut Grips Pingel Elec shifter, Hyper-Pro RSC Damper, BlackChrome Wheels, Sargent Seat,Factory Pro Velocity Stacks,PCIII USB,Bonneville Pro, TPX Radar/Laser Detector, TPX Laser Jammer, Goodridge Shadow series braided lines front and rear, Rifleman 1/5 turn throttle, Fusion LED Stage IV Kit, DDM HID's 10,000k