I happened on the Single Speed bicycle craze by surfing the web
this August. My son had an old set of parts from a Bridgestone MB-5
mountain bike ( c.1993 ), and I felt that for under $100, it would
be a fun project to make one.
frame had vertical dropouts, I was able to get a 46 x 15 drivetrain
to work with the help of a half link. There is some chain looseness,
but not enough to drop the chain as the rear cog is wrapped more
than 180 degrees.
26 X 1.5 tires, inner tubes, headset, seat post and an old seat
did grind 5 - 3/8 washers to the shape of the letter "D" as spacers
in order to position the old outer chain wheel inside the crank
arm for proper alignment with the rear cog and also to use up the
extra length of the stock sprocket bolts. The rear wheel was not
redished as I used the old Shimano cassette free hub (splined) and
a Bike Nashbar Single Speed Conversion kit (without the supplied
chain tensioner), for the rear cog and the proper spacers.
bike weighs in at around 20 pounds, rides well and allows me to
go with my granddaughter to Starbucks for a Mocha Lattie.
in all, the project was a success, except that my granddaughter
feels the seat was rather high. (How else can I keep her off of
photos show that, while not the most beautiful outcome, a pile of
junk can be made functional and a lot of fun!