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Bottom Bracket threads in frame are crooked(6 posts)

Bottom Bracket threads in frame are crookedshirt
Sep 19, 2002 1:47 PM
What can I do?

It's a newer aluminum frame. I'm assuming you can't re-chase the threads. I've heard there's an older Mavic bottom bracket that doesn't even use the threads, but I can't get any specific information on it.

Thanks,

/shirt
re: could you describe what happened, and/or why you think ...Akirasho
Sep 19, 2002 2:24 PM
... they're crooked?

There are a few proprietary press fit BBs out there... but unless your frame was designed for said... it might be a risky proposition (even in the hands of an experienced framebuilder).

Hopefully, a: your BB threads are not trashed or b. someone else has a better idea...

We abide.

Remain In Light.

Be the bike.
re: could you describe what happened, and/or why you think ...shirt
Sep 19, 2002 4:44 PM
Threads are fine.

Symptoms described in greater detail below.

We ride.

Walk with Dog.

Wax the bike.
Viva ItaliaKerry
Sep 19, 2002 4:33 PM
If your BB really is cross threaded, your next best option these days is to have it tapped out to Italian thread (36 mm diameter vs. nearly 35 for English). Before doing that, you can try chasing the threads, as the cross threading may only be on a few of the outermost threads. Whatever route you choose, take it to somebody who really knows what they are doing - most shops are not equipped to handle this.
It's already Italianshirt
Sep 19, 2002 4:42 PM
...and my LBS says, "Dude, you're screwed."

The symptom is a creaky bottom bracket that can't be adjusted away. I've been through several in two years.

I know it's crooked, because if you put in just the drive side cup and cinch it down with the spindle in place, when you look at the other side the spindle is about as centered as the lunatic fringe.

When you put the other cup in, it makes the bearings squeal in pain...

/shirt
re: Bottom Bracket threads in frame are crookedJuanmoretime
Sep 19, 2002 4:50 PM
There used to be a guy that would machine the botom bracket shell out and bond in a sleeve. Email davec@shout.net, he is the owner of Wild Thang Cycles. He told me about it.