Threadless Headset 1-1/8"x34x30mm Chrome. bicycle headset, bike headset, chopper headset, Bike part Threadless Headset 1-1/8"x34x30mm Chrome. Threadless Headset 1-1/8"x34x30mm Chrome. We carry over 3,000 bicycle parts and accessories. If you have any questions about any of our parts, please send us an email.