Singlespeed & Fixed Gear - Do I dare put road cranks on my track bike?
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07-18-08, 10:46 AM
As much as I love my new Fuji Track, i'm not so crazy about the cheapo crankset..an FSA branded bootleg RPM piece. There's a very lightly used Ultegra road crankset that my dad pulled off of his Lightspeed just sitting in my garage. The chainwheel is 52-39 and is pretty much useless to me, but the cranks are in good condition, seem to be high quality and are quite light. Is there any reason i wouldn't be able to or shouldn't throw these cranks on my bike (besides the obvious fact that my bb will explode into a fiery ball of riser bars and aerospokes as soon as is comes in contact with them)? I'd probably ditch the junky chainwheel and pick up a Sugino Messenger to use with the cranks.
07-18-08, 10:55 AM
my bb will explode into a fiery ball of riser bars and aerospokes
gotta watch out for that side effect.
you just need an appropriate BB that will give you track chainline, a proper ring, and single chainring bolts.
07-18-08, 11:53 AM
shouldn't be a problem. Try it with an appropriate chairing and see where your chain line is at, and then adjust by changing your BB and you should be good to go.
Sounds like you have some nice cranks...
07-18-08, 03:36 PM
Are the Ultegra Cranks Octalink splined? If so, your dad needs to give you the bottom bracket too. Or you can buy a Shimano 105 one for around $40. With a 109.5 Octaling bottom bracket, Ultegra cranks should give a pretty good chainline.
07-18-08, 05:01 PM
I have Octalink 105's on my Fuji Track.
Chainline is 42ish with the chainring on the inside.
Shimano road double chainline is (practically/ afaik) always 42ish on the inside with the recommended bb spindle. From there you can do a little math and try to get a shorter spindle if you want to run the chainring on the outside, but be warned that when you slam the crank in that close, the little horizontal tabs that hold the inner ring might rub on the chainstay. I had to file mine (old ass 600) down a little.
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