What bottom bracket does my micargi bronco need for me to run 3peice cranks??
- Thread starter nessfourdubb
- Start date
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Depends on which 3 piece crank set.
For a traditional set up (non bmx) I like adapter cups and cartridge b.b.
For the cheaper route there are unsealed that use a lrg. Bb., with the spindle threaded for it.
For bmx style just make sure it's to fit an American large b.b.
Nessfourdubb has not yet achieved that level of planning with this project.
http://www.ratrodbikes.com/forum/index.php?threads/crank-size.86225/
you'll need a euro adaptor:
http://porkchopbmx.com/Euro-to-American-Bicycle-Bottom-Bracket-Adapter-SILVER-BBIMBA01.htm
And you'll need a JIS suare taper BB set, with a 68mm BSC set of cups. I like Shimano UN55, but anything with a square taper spindle labeled "68mm english thread" or "68mm BSC" that is NOT marked "ISO taper"... You'll need to pick a spindle length; i'll bet a 110mm will line up pretty well with that crankset and your KT hub, but i believe I recall from your other thread that you want to run 3" tires, in which case you might want to go with a 115 and use an offset "deep dish" rear cog. Chainline is the hardest part of these things; a typical coasterbrake hub has a 42mm standard chainline, which can be changed by running dished cogs and changing rear spacing..... Cranks tend to be unique as far as what spindle they'll need to achieve a given chainline. These things, unfortunately, are far from being standardized....
http://www.niagaracycle.com/categor...acket-square-taper-68-x-115-english-threading
(FYI: the "68mm" refers to the distance between the shoulders at the threads. The "115mm" refers to the distance between each end of the black spindle.)
http://porkchopbmx.com/Euro-to-American-Bicycle-Bottom-Bracket-Adapter-SILVER-BBIMBA01.htm
And you'll need a JIS suare taper BB set, with a 68mm BSC set of cups. I like Shimano UN55, but anything with a square taper spindle labeled "68mm english thread" or "68mm BSC" that is NOT marked "ISO taper"... You'll need to pick a spindle length; i'll bet a 110mm will line up pretty well with that crankset and your KT hub, but i believe I recall from your other thread that you want to run 3" tires, in which case you might want to go with a 115 and use an offset "deep dish" rear cog. Chainline is the hardest part of these things; a typical coasterbrake hub has a 42mm standard chainline, which can be changed by running dished cogs and changing rear spacing..... Cranks tend to be unique as far as what spindle they'll need to achieve a given chainline. These things, unfortunately, are far from being standardized....
http://www.niagaracycle.com/categor...acket-square-taper-68-x-115-english-threading
(FYI: the "68mm" refers to the distance between the shoulders at the threads. The "115mm" refers to the distance between each end of the black spindle.)
