F
Franz Bestuchev
Guest
I have an older bike that provided me with my first ever experience with
Al years ago, and went through some bottom bracket issues with it. The
original that came with the bike was the traditional type with
loose/removeable separate cups a sleeve in the center, independent
bearings, and an axle that developed a nasty pit in the bearing track.
I ran with it this way for a while until it started to get really bad
and I had to get a replacement from the LBS, I didn't have time to put
it together just then and when I did I realized that the spacing between
the bearing races were so far apart that the bottom bracket cups would
no longer even screw back in...the threads would still stick out 1/4" or
more. So I tossed that.
I had since moved and went to a *different* LBS, with all my original
bottom bracket bits and told that I was now in the world of the Shimano
"sealed cartridge unit" bottom bracket and that they didn't have
something there, but would order the right piece. I bought my new Park
install tool and the boxed Shimano part they had ordered. I once *again*
moved to another state.
When I finally got there and installed this bottom bracket I found that
the only way my bicycle would now fit the front crank was to make it a
double chainring. I was living in a flat part of the world now, so
losing the third front chainring wasn't a big deal at the time...upset
about the part but back on my wheels.
I now WANT that third chainring back because I'm living in a hilly area.
I removed the Shimano sealed BB and it is a BB-UN52, "68", BC 1.37x24. I
no longer have the original pitted axle, but the only thing I can find
on the original BB parts is "1.37x24T, JAPAN, TANGE".
So...I think the conclusion is that I need a "1.37x24" (not sure what
the numbers represent) and that it *needs* to be a "T"...which I can
only assume means TRIPLE...as in triple chainring.
Does this qualify me for the genius club?
Are there Shimano gurus whos know what part # I should *specifically*
tell my current LBS so they can't have ANY opportunity to muck this one
up? Will my Park bottom brack tool still work on today's Shimano sealed
cartridges?
Thanks all.
Al years ago, and went through some bottom bracket issues with it. The
original that came with the bike was the traditional type with
loose/removeable separate cups a sleeve in the center, independent
bearings, and an axle that developed a nasty pit in the bearing track.
I ran with it this way for a while until it started to get really bad
and I had to get a replacement from the LBS, I didn't have time to put
it together just then and when I did I realized that the spacing between
the bearing races were so far apart that the bottom bracket cups would
no longer even screw back in...the threads would still stick out 1/4" or
more. So I tossed that.
I had since moved and went to a *different* LBS, with all my original
bottom bracket bits and told that I was now in the world of the Shimano
"sealed cartridge unit" bottom bracket and that they didn't have
something there, but would order the right piece. I bought my new Park
install tool and the boxed Shimano part they had ordered. I once *again*
moved to another state.
When I finally got there and installed this bottom bracket I found that
the only way my bicycle would now fit the front crank was to make it a
double chainring. I was living in a flat part of the world now, so
losing the third front chainring wasn't a big deal at the time...upset
about the part but back on my wheels.
I now WANT that third chainring back because I'm living in a hilly area.
I removed the Shimano sealed BB and it is a BB-UN52, "68", BC 1.37x24. I
no longer have the original pitted axle, but the only thing I can find
on the original BB parts is "1.37x24T, JAPAN, TANGE".
So...I think the conclusion is that I need a "1.37x24" (not sure what
the numbers represent) and that it *needs* to be a "T"...which I can
only assume means TRIPLE...as in triple chainring.
Does this qualify me for the genius club?
Are there Shimano gurus whos know what part # I should *specifically*
tell my current LBS so they can't have ANY opportunity to muck this one
up? Will my Park bottom brack tool still work on today's Shimano sealed
cartridges?
Thanks all.