Finally, after almost five months of searching (and kind of cheating by actually buying one ready-made), we’ve found a donor bike for the Gadget Lab fixed-gear conversion. It’s an old Massi Master road bike, with Italian Gara Cro-Mo steel tubing and forks. The groupset, or brakes and gears and everything else that moves, is Shimano 105 ,which has the gear-shifters built into the brake levers (that threw me at first).
As you can see, the frame is a rather lovely metallic purple color and the style of the graphics plus a little googling makes me think that the bike is from the 1980s. Judging by the comments we get on any of our bike posts, I’m sure y’all can do a much better job of identification.
The wheels have the matching Shimano hub with Wolber rims, and they look so nice that it seems a shame to swap them out. But swapped they will be, as however slick this looks as a road bike, it was bought to be sacrificed.
There’s one problem, and the eagle-eyed amongst you will have spotted it already. The frame has vertical dropouts, meaning chain tension can’t be adjusted without either luck or an ugly tensioner. I will be using a half-link BMX chain, so fingers crossed — but the frame is so nice I couldn’t help but buy it.
The conversion will take place over the next few days, replacing wheels, chain, seat (it’s a nice seat, but plastic saddles in the summer are hell) and stripping off all the extra metalwear.
I need a few tips. First, the rear brake cable runs trough the top tube, entering and exiting through lugged holes. I’m keeping all the parts I strip, in case I decide to change back in the future, but this looks impossible to re-thread. What kind of voodoo is needed to do it?
Also, tips on chain-tensioners are welcome. I’m going to do my best to match up gear ratios and chain to avoid adding one, but otherwise what is the smoothest, quietest way to go?
I think everything else will be pretty easy, between a lifetime of tinkering and all the good advice the Gadget Lab readers have lent over this series of posts. First, though, I have a puncture to fix: The guy I bought it from hadn’t put enough air in the tires and I got a pinch-flat.
See Also:
- Gadget Lab Fixie Project Update: Things Are Going Slowly, But They …
- The Great Gadget Lab Fixie Project: Help Us Build a Better Bike …