They are tapped and faced prior to painting, masked for painting, but not post-paint machined.
Disc mounts, certainly, don't need facing in my experience. Some people are happier with the BB cleaned up a bit. I've never bothered.
Modern "post-mount adapted" brakes are far more tolerant to any disc mount alignment than old "fit with shims" disc brakes (how did we ever put up with them??)Posted 7 years ago-Liam-Member
Mine was faced. The BB had a sharp edge on the thread which caused the cup(external) not to butt up to the shell but easily sorted.
Tbh, I've never bothered getting shells faced. I'm pretty sure the manufacturing process of the shell includes a quick face up and we're all capable of removing any residual paint, I'm sure 😉Posted 7 years ago
i found the BB thread a little stiff the first time, but nay problem.
lucky you i just f£$ked a new bb drive side was fine, 3/4 of the other side was fine the last 1/4 got a bit tight then tried to take it off,now in the bucket now off to the lbs to get the threads chased out of the bb shellPosted 7 years ago
brant are you really questioning is mounts? Everyone know they are vastly superior in engineering terms.
No – I'm questioning the logic of early disc brake calipers that used 0.1mm shims to acheive pad/disc alignment.
That was rubbish.
I'm a big fan of (as I said) "post-mount adapted" brakes – ie: post mount caliper with an IS bracket, as it were…
my disc tabs had paint all over them so i'd factor in a trip to the lbs to be on the safe side.
They're *usually* masked before painting. So sorry about that.
I'm pretty sure the manufacturing process of the shell includes a quick face up and we're all capable of removing any residual paint, I'm sure
Actually, aluminium frames (not steel ones) are welded up with an unthreaded BB. The threads for the BB are then put in by machine, usually (I think) after heat treating (but before paint).Posted 7 years ago
Actually, aluminium frames (not steel ones) are welded up with an unthreaded BB. The threads for the BB are then put in by machine, usually (I think) after heat treating (but before paint).[/quote]
i guess i was unlucky with my bb shell? i am asuming it will be ok to get the the threads cleand up a lbsPosted 7 years ago
as an update, got frame today, unfortunately seatpost and bb failed to show 🙁
Now the shells look fine no overspray or anything and the bb thread look/feels clean, so all good, but for peace of mind, was thinking of getting some very fine sandpaper and sanding block and give it a quick go over to make sure, any one feel this is a bad idea which will only end in my un-timely demise!
CheersPosted 7 years ago
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