Stripped bottom bracket threads - what to do?
I recently bought a used touring frame on ebay. The frame has a Mavic bottom bracket installed, but unfortunately I didn't realize that should be a clue that the bb threads were damaged. A little research would have alerted me, but it didn't even occur to me at the time.
The intended use was for daily commuting, long day rides and multi-day (and hopefully at some point multi-week) self-supported touring. It's a high quality used touring frame, and before I noticed the bb shell problem I was expecting that my girlfriend would get years of daily use from this frame.
Now I need to decide what to do. Here are my options as I see it. What do you think?
1. Have the bb shell repaired by brazing in some brass and re-cutting the (english) threads. I spoke with a reputable local framebuilder and he estimated $100 to repair it this way. Some of the paint would be ruined, but I don't mind that. Will brass threads hold up to heavy use?
2. Ream the bb shell and cut Italian threads. But my reason for having the bb shell repaired is so I can use a standard cartridge bottom bracket. How easy is it to find Italian bb's?
3. Use the Mavic bottom bracket. Look for another one to have for backup. If we have a failure while on a trip, have a friend ship the backup bb to us wherever we are. Or cancel the trip and head home. From what I've read, the Mavic bb's are hard to find (expensive?) and use proprietary bearings which are no longer manufactured. A similar bottom bracket made by YST is available, but I've read negative reviews about its reliability, so that is not an option. Heading out on a trip with a bottom bracket that would be very difficult to replace, should it fail, does not sound like a good idea to me.
Also, considering that the damage (non-drive side threads stripped) was not explicitly mentioned in the auction, and I did not ask "is there any damage to the frame that was not explicitly mentioned", do you think it's reasonable that I expect the seller to pay for all or at least part of the repair?
This was my first unpleasant ebay surprise, I'll be more wary in the future!