Does anyone know if there is a specific size to the bottom bracket of a shogun chromoly 800 road bike?
I am looking to replace the entire bracket rather than just the ball bearings
THanks !

ID the BB Park Tool Co. » ParkTool Blog » Bottom Bracket Standards yourself, and replace as needed using the appropriate repair guides.

Thank alot
That helped so much!

You have a few different "sizes" to worry about, as a new bottom bracket will need to fit both the frame and the crankset. The cups or cartridge body will need to be the correct diameter and threading to fit the frame. If it's an adjustable type bottom bracket, the spindle's races need to be spaced correctly for the frame's shell width. The spindle's overall length needs to match the crankset's design specs. The spindle also needs to be the correct type (and taper if applicable) to mate with your crank arms.

Most Shoguns I've seen or heard of were Asian bikes made in the '70s and '80s. If that's the case for your bike, it should be safe to make a few assumptions: Your frame's bottom bracket shell is probably 68 mm wide and English threaded, and you probably have square taper cranks. Being Asian, the taper is going to be JIS (as opposed to the ISO taper often seen on Italian components). That leaves one critical dimension to worry about: spindle length. The correct spindle length for you will depend on what crankset you're using. The safest way to figure this out would be to measure your existing spindle. Or remove it and look for markings that you can cross-reference.

Manufacturers changed standards at random times, sometimes even within a model year.There's no sense in us trying to write it all out, especially as the info is available if you Google replace bottom bracket and do some reading, especially the sheldonbrown.com results. I can tell you with certainty that the BB is 68mm, English threaded, so all you need is the spindle length if you are using the same crank, and to make sure your chainline will be OK.