Senior Member
Join Date: May 2008
Location: Southwest Michigan
Posts: 1,561
Bikes: Fuji Monterey, Schwinn Traveler, Fuji Special Road Racer, Gitane Interclub, Sun EZ-1, Schwinn Frontier, Puch Cavalier, Vista Cavalier, Armstrong, Raleigh Sports, Schwinn Stingray
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I'm pretty sure my old Schwinn Frontier mtn bike is rocking the SIS w/5-speed freewheel. I like it because the SIS is old and made of metal not plastic, although the thumb levers aren't. It works fine, but I wouldn't see me hunting this system down and switching over to it. I've thought of switching it out, but it just works well and there's a lot to be said for that and leaving well enough alone.