Can I bring this frame back from the dead?

"Dumpster Bike" <[email hidden]> wrote in message
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Quoted message said:

i came across a jamis mountain bike hardtail frame that looks like it might fit. its a durango SX,
triple gauge 7005 aluminum with no fork and no damage that i can see, EXCEPT 3/4 of the threads on
the drive side of the bottom bracket shell are stripped out starting from the outside. i can still
see the threads but i doubt they will hold a cup.

Here are few solutions people have used for this in the past.
1. Tap the BB shell for an italian-threaded BB.

2. I think there are BBs (YST?) that are supposed to work in a stripped BB shell.

3. Use some kind of filler, and retap the threads.

"David" <[email hidden]> wrote in message
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Quoted message said:

"Dumpster Bike" <[email hidden]> wrote in message

"]news:[email hidden]...

Quoted message said:

Quoted message said:

i came across a jamis mountain bike hardtail frame that looks like it might fit. its a durango
SX, triple gauge 7005 aluminum with no fork and no damage that i can see, EXCEPT 3/4 of the
threads on the drive side of the bottom bracket shell are stripped out starting from the
outside. i can still see the threads but i doubt they will hold a cup.

Here are few solutions people have used for this in the past.
1. Tap the BB shell for an italian-threaded BB.

2. I think there are BBs (YST?) that are supposed to work in a stripped BB

shell.

Quoted message said:

3. Use some kind of filler, and retap the threads.

Sure -- if you have the requisite taps. JB Weld should work fine for this.

Matt O.

Quoted message said:

no damage that i can see, EXCEPT 3/4 of the threads on the drive side of the bottom bracket shell
are stripped out starting from the outside. i can still see the threads but i doubt they will
hold a cup.

If you can see threads they may be OK with just a chasing. Phil Brown

Dumpster Bike said:

i came across a jamis mountain bike hardtail frame that looks like it might fit. its a durango SX,
triple gauge 7005 aluminum with no fork and no damage that i can see, EXCEPT 3/4 of the threads on
the drive side of the bottom bracket shell are stripped out starting from the outside. i can still
see the threads but i doubt they will hold a cup.

barring that there is no other damage (i have yet to check it with frame alignment tools), how may
i go about fixing these threads, how much will it cost, and is it even worth it cost wise? the
frame has so far cost me nothing and i have enough parts to build it up, but rechasing threads,
messing around with helocoils or cutting threads to fit in weird larger bottom brackets sounds
like it may become expensive real quick. any ideas or experience with this type of thing? is it
safe to ride? how did this happen initially? thanks!

Yes - just get a BB designed for stripped threads. They have a lockring on each side and often the
chainline is adjustable too.

J.B. weld? YST? what do these things mean? and i have a friend who does frame work well so retapping
shouldnt be too big a deal.

"Dumpster Bike" <[email hidden]> wrote in message
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Quoted message said:

J.B. weld?

It's an epoxy with added steel. It's the first thing I think of for this sort of thing too, but I'm
far from an expert, and I'm not sure it's the best choice.

Quoted message said:

YST?

A brand of BB.

Quoted message said:

what do these things mean? and i have a friend who does frame work well so retapping shouldnt be
too big a deal.

If you tap to Italian threads, or install the BB-for-stripped-shells, you limit your BB/crank
choices. Filling in and retapping, while not the most promising, gives you the most choices.

In article <[email hidden]>, [email hidden] says...

Quoted message said:

J.B. weld? YST? what do these things mean? and i have a friend who does frame work well so
retapping shouldnt be too big a deal.

Go to an auto parts place and ask for a tube of jb weld. It is some sort of epoxy that can be used
to repair metal. YST is a brand name. they make bottom brackets, among other stuff.
------------
Alex

Someone posted a link a few weeks ago to a threadless BB. Was inexpensive, too. I've also seen
threadless BBs in some BMX catalogs.

Dumpster Bike said:

barring that there is no other damage (i have yet to check it with frame alignment tools), how may
i go about fixing these threads, how much will it cost, and is it even worth it cost wise? the
frame has so far cost me nothing and i have enough parts to build it up, but rechasing threads,
messing around with helocoils or cutting threads to fit in weird larger bottom brackets sounds
like it may become expensive real quick. any ideas or experience with this type of thing? is it
safe to ride? how did this happen initially? thanks!

It probably happened because the bottom bracket was cross-threaded, and the guy doing it did not
know what he was doing. Aluminum threads are not all that strong.

You have several options. You could apply some sort of "liquid metal" goop, or an epoxy resin or
something, and try to chase the threads through that. If paint is not a problem, you might try
"alumaloy" which makes great claims for repairs of all sorts with aluminum. The heat needed would
ruin the paint around there, though.

But I would try, first, a sturdy Shimano cartridge bottom bracket. They really don't need all the
threads to be there to hold well (I know this). If that doesn't work, heck, it's less than $20.
There are a few bottom brackets designed for threadless shells -- held on by a beveled edge.

You can have a local shop chase the threads to see if some good threads are left.

Some of these, at least, are worth a try.

--

David L. Johnson

__o | Do not worry about your difficulties in mathematics, I can _`\(,_ | assure you that mine
are all greater. -- A. Einstein (_)/ (_) |