Mountain Biking - Can I use a BMX bottom bracket?
Bikeforums.net is a forum about nothing but bikes. Our community can help you find information about hard-to-find and localized information like bicycle tours, specialties like where in your area to have your recumbent bike serviced, or what are the best bicycle tires and seats for the activities you use your bike for.
10-11-07, 06:13 PM
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?
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 . . . .
10-11-07, 06:52 PM
Yeah, I noticed that too. Not much more $ either, and no cheesy plastic threads. Seems like a no-brainer if it fits.
10-12-07, 10:31 AM
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.
10-14-07, 12:19 AM
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...
10-14-07, 01:36 AM
in short: yes, if all the specs match(make sure:eek:), go for it - nothing should hold u back (except sometimes money:().
Powered by vBulletin® Version 4.1.12 Copyright © 2014 vBulletin Solutions, Inc. All rights reserved.