Square taper to threaded BB swap

[ChrisL]

Hi Everyone

 

I'm considering replacing the crank-set and BB on my wife's MTB. It currently has an old square taper cartridge type BB with a Suntour 3 blade crank-set. I want to replace it with a Shimano threaded BB and hollowtech crank-set. Mainly for weight savings an maintainability.

 

I've read that one should face the BB shell before doing this so that the threaded BB bearings don't wear prematurely. The facing should remove any paint that may have made it's way onto the edge of the BB shell during manufacture which could prevent the threaded bearing cup from seating flush with the frame BB shell. I've had a good look at the BB shell and there is no paint, just bare metal. Would you recommend that i face BB shell regardless or just install the threaded BB as is.

 

Also what else should i look out for or be aware of, and would you consider this swap to be worthwhile.

 

Thanks

 

 

[dirtypot]

Just clean it up so that there's no dirt in there before installation and you should be good to go.

[Psyrax]

You dont need to face the BB shell. Its only needed when its a new frame or newly painted frame. Like dirtypot said, just clean very well.

[ChrisL]

Thanks guys

[Swany05]

Clean and put some grease on the threads and you should be good to go