I have an older 1990-1996 Shimano Mountain Track 800 that I got from my brother and is in pretty good condition. The past couple months I've been going thru and upgrading all the parts to make it a little more comfortable to ride on the road, and just doing some general maintenance. I'd really like to replace the crankset, because its the same one thats been on it for 15 years, and its a little worse for wear. Now the stock Bottom Bracket is a Shimano square taper, and the crankset I have in mind uses an ISIS BB. I've already popped the BB off, but before I run out and buy a new one, I wanted to make sure that if I got the properly sized ISIS bracket it would fit. I'm not clueless when it comes to bike repair, but neither am I terribly experienced, so I wanted to just make sure everything would work before I started throwing money around.