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Old 08-08-12, 11:46 PM   #1
Apache Thunder
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Longer then normal bottom bracket cup?

Any one know of a brand that has slightly longer then normal left side bottom bracket cups?

I moved my ebike parts over to my mountain bike and noticed that I will need to install more spacer rings on the drive side so that the motor bracket is lined up better. However there isn't enough exposed threading on the left side cup to keep the lock-ring in place if I put in any more spacers. So I need one that is 2 to 4mm longer then normal so that I will have enough threading on the left side bottom bracket cup to ensure the lockring will stay on and still keep the pedal axle in place when under power.

My bike is one of the cheaper Wal-Mart bikes, thus it does not have any fancy cartridge system for the bottom bracket (would probably be a pain in the a** to try and get my mounting bracket to get along with a cartridge based BB anyway. ).

It's the old school cup and cone type bottom bracket with a separate left and right screw on cups (left side being the adjustable side) with loose bearings in a retainer. The threading has the left side unscrewing counter clockwise while the right side screws off when turned clockwise.

I've found multiple brands of these but none of which indicate the length/amount of threading of/on the left side cup.

Oh and the left side of the axle offsets the pedals so that the pedal cranks will have enough clearance to get by the motor, so I doubt I would ever find one that is too long! There is quite a bit of clearance between the left pedal crank and the bottom bracket. So space on that side is not an issue.

So the longest one you can possibly dig up would good enough for me.

Last edited by Apache Thunder; 08-08-12 at 11:51 PM.
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