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What Crank/BB combinations are you using successfully on your Karate Monkey? Please include crank length and chainring sizes. Thanks!
 

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Isis 128mm BB with FMF BMX forged 175mm cranks, 110BCD five arm, 34T Surly Steel chainring. Chainline = 55mm for Surly Single Speed hub. (rear = 22T)

 

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milk_badger said:
What Crank/BB combinations are you using successfully on your Karate Monkey? Please include crank length and chainring sizes. Thanks!
Current combination (and favorite to date on this bike): 180mm Middleburn Duo 29T/42T cranks, Race Face ISIS BB 113mm

Previous Successful Combinations on my KM

175mm Shimano XT Hollowtech cranks (22/32/44), Shimano Octalink 73mm x 113mm (also ran it with 118mm and 126mm for clearance issues with front derailleur and fat tires)

175mm RaceFace Next LP cranks (20/29/42), RaceFace Taperlock BB (square taper)

Taperlock is adjustable for the chainline which helped when dealing with front derailleur clearance issues.

BB
 

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Ultegra 6300 (square taper) double w/ 42t ring in the outer position, UN-73 113x68mm. Inside of the crank just barely clears the stays.
 

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WI Eno crank 175mm with 32 T Boone ring on a 116mm Phil stainless symmetrical BB...had to adjust the BB to offset toward the drive side a few mm to dial the chain line.

Also have used the Shimano LX cranks with a 32 T ring.
 

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Sugino 94 bcd 175mm cranks, UN-73 118mm, w/ 30 and 34 t rings. Mated to a Hope SS hub, running both gears and SS.

Currently I've got a Race Face North Shore 94 bcd 165mm cranks, a Phil 111mm bb, and a 38t Blackspire ring. Surly flip-flop hub with a 18t Surly track cog.
 
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