SRAM PC-1 all the way!!! You can find them under $15 all day. Easy to use and dependable masterlink. Never had any problems with mine, and I have used them on the track bike, street fixies, my ss mtb, and bmx. No stretch issues either. I'm still well within tolerances after a full season of racing and training on mine. It's a little heavier, but chain weight is negligible anyways.