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Old 10-11-07, 05:13 PM   #1
andrefulci
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Can I use a BMX bottom bracket?

In my search for a quality 68x113mm square taper bottom bracket for my MTB, I came across the Sinz Expert. It's listed as a BMX product, but the width and axle size fit the bill. I can't find any other size specs and am unfamiliar with BMX components. Anyone know if there's a compatibility issue here?
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Old 10-11-07, 05:42 PM   #2
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It has the JIS taper and English thread cups, so I see no reason why you can't. For some odd reason, it's listed as weighing about 100g less than a Shimano UN54. Strange . . . .
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Old 10-11-07, 05:52 PM   #3
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Yeah, I noticed that too. Not much more $ either, and no cheesy plastic threads. Seems like a no-brainer if it fits.
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Old 10-12-07, 09:31 AM   #4
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While I doubt that there is any compatibility issue I would be concerned about the strength of the bottom bracket you referred to. In BMX racing "Expert" refers to a frame size for racing bikes, it goes Mini/Junior/Expert/Pro/Pro XL. Expert is a frame size that fits kids in the 8 - 12 year old range, depending on how tall they are. Most "Expert" level bikes have a weight limit of around 110 - 125 lbs, this is usually based on the wheels (20 * 1 3/8) but the other components such as bars, cranks and bottom brackets are also built with a smaller rider in mind.
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Old 10-13-07, 11:19 PM   #5
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Thanks for the explanation andymac! Glad I didn't drop $ on a BMX BB designed for 125lbs. I'm about 160 and it's going on a singlespeed, so I probably would've snapped or bent the spindle before too long. Appreciate you kicking the knowledge...
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Old 10-14-07, 12:36 AM   #6
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in short: yes, if all the specs match(make sure), go for it - nothing should hold u back (except sometimes money).


cheers, shawn
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