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Reaming/Facing of Head Tube & Facing/chasing of BB(4 posts)

Reaming/Facing of Head Tube & Facing/chasing of BBcyclejim
Jun 21, 2002 2:18 PM
I am trying to determine if I need to have my head tube reamed & faced, and my BB threads chased/ shell faced before building up my frame.

I know in some cases, this is not always necessary. Just on a visual inspection, it looks like the BB shell needs to be faced as there are some bits of aluminum clearly visible on the face of the shell.

Any other tips or things to look for?
Just take it into a shop--easier in this caseBryanJL
Jun 21, 2002 2:34 PM
Hey CycleJim,

I just built up a bike, and debated doing the bb myself (didn't really seem to need to be chased, faced).

Anyway, it costs $20 at the shop to install the bb...and they have the tools, and more importantly, knowledge.

Just take it in...a good shop will tell you if it doesn't need to be done, and will do it right if it does need to be done.

With an important part like the headset/tube and the bb, it's far more worth it in my opinion to let the shop handle it. The cost of both procedures will be far less than the tools alone, not to mention the possibility of having to have a mistake fixed (if it is fixable).

Just make sure the shop knows what they are doingKerry Irons
Jun 22, 2002 3:56 PM
There are a lot of bike shops that don't have the proper tools, and many of the ones that do have the tools don't really know how to use them. Make sure that whoever you take it to has both tools and skills.
re: Reaming/Facing of Head Tube & Facing/chasing of BBxxl
Jun 21, 2002 2:43 PM
You've spent enough dough on a frame, so I'd pay the extra $30 or so to have it prepped. It requires specialized tools that few riders would use enough to justify their cost.

Since you asked, when a frame's been properly faced/chased, the two outside "end" surfaces should be exactly parallel to each other, and evenly shiny new metal all around, with no burrs, paint chips, etc. cluttering things up. Mavic BB used to have to be faced with a special chamfering facing tool, but I doubt you're going that route for your BB. Chasing threads leaves them pretty clean, too, but not as clean as faced tube ends.