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Old 02-09-14, 05:31 AM   #1
alex jb
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Older SRAM Apex crank set, what BB to use?

Hey fellas,

Here's a pic of my BB from an early Apex double crank set.


What I would like to know is what BB can I replace it with?
I'm going to be rebuilding with another frame with a wider tire clearance, there's no room for more clearance for wider chain stays right now without widening the crank tread so I'm thinking of a BB from a triple
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Old 02-09-14, 07:19 AM   #2
dsaul
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That looks like a Truvativ Power Spline bottom bracket. Its a Truvativ proprietary design and it looks like it comes in 108mm, 113mm and 118mm spindle lengths.
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Old 02-09-14, 03:50 PM   #3
alex jb
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Thanks.
seems like it's a 108mm and there is 113 and 118 available.
5mm increase in drive side width is not much though, think I may need to look for another crank like a triple that I can drop the granny ring from and grind back the mounting bolts.
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Old 02-09-14, 08:09 PM   #4
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i would think that we would need to know the type of BB SHELL your new frame will have. or are you planning on buying a frame that facilitates a BB that, in turn, facilitates your existing crank?

when changing frames a series of precedents must be addressed. material, clearance, size, suitiability to intended use of components, etc., etc. i wish it were simpler.

i say this because BB shells now come in various configurations as to width, ID, threaded or press-fit, etc. if it were me, i would first get the frame that i wanted then possibly address the crank issue.

or find a frame that only addresses your tire width issue and is in all other respects the same. good luck to you.
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Old 02-10-14, 01:00 PM   #5
alex jb
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I know the frame will be a 68mm English BB, I haven't built the frame yet, it will be May/June time.
I want to build the chain stays wide enough to get a 40/45mm tire, but being 700c, I don't want to make the rear triangle extra long to try and have the tire circumference outside the chain ring diameter. That works on cast/machined/forged shapes on MTB's but the new frame material is bamboo and can't be manipulated like a block of alloy or steel
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