facing bb shell
- tallywhacker
- Posts: 1775
- Joined: Thu Apr 12, 2007 3:21 pm
- Location: Perth
facing bb shell
Postby tallywhacker » Fri Dec 21, 2007 10:03 am
just had a frame powdercoated. The bb was faced before I decided to powdercoat it. Is it imperative that it be refaced to remove the paint from the fixed side before the bb is installed ? (also the same question for the headtube)
- europa
- Posts: 7334
- Joined: Sun Jul 16, 2006 10:51 am
- Location: southern end of Adelaide - home of hills, fixies and drop bears
Postby europa » Fri Dec 21, 2007 10:08 am
Got no idea mate. Have you tried screwing the bb in? If it screws in okay, I'd just go with it, but check it for tightness during the settling in process.
Regarding the head tube. The cups will have to be pressed in and maybe won't because of the extra thickness. I'd give it a go and if it needs too much pressure, then look at extra work.
But I'm only guessing. People who know might have a real answer. Keep us posted please as this is something others (like me) will be facing.
Richard
Regarding the head tube. The cups will have to be pressed in and maybe won't because of the extra thickness. I'd give it a go and if it needs too much pressure, then look at extra work.
But I'm only guessing. People who know might have a real answer. Keep us posted please as this is something others (like me) will be facing.
Richard
I had a good bike ... so I fixed it
- sogood
- Posts: 17168
- Joined: Thu Aug 31, 2006 7:31 am
- Location: Sydney AU
Postby sogood » Fri Dec 21, 2007 10:29 am
Is there anything on the face of the BB? Maybe a light rub with some wet and dry is all that's needed.
The other thing to be careful of with facing the BB is how quickly it'll chew up the width of the BB. Once it goes below spec (English thread/Italian thread), your frame is toast. So only face the BB very sparingly and alway check the width before, during and after.
The other thing to be careful of with facing the BB is how quickly it'll chew up the width of the BB. Once it goes below spec (English thread/Italian thread), your frame is toast. So only face the BB very sparingly and alway check the width before, during and after.
Bianchi, Ridley, Tern, Montague and All things Apple
RK wrote:And that is Wikipedia - I can write my own definition.
- tallywhacker
- Posts: 1775
- Joined: Thu Apr 12, 2007 3:21 pm
- Location: Perth
Postby tallywhacker » Fri Dec 21, 2007 10:58 am
There is paint on the face and I was thinking that may be the best thing to do. Its just that you always read about having to face the bb.sogood wrote:Is there anything on the face of the BB? Maybe a light rub with some wet and dry is all that's needed.
- sogood
- Posts: 17168
- Joined: Thu Aug 31, 2006 7:31 am
- Location: Sydney AU
Postby sogood » Fri Dec 21, 2007 11:11 am
When I built my Ridley, I asked a reputable frame builder to see if he can help me face the BB. He basically said that the frame should be true from the factory and all he would do is to use a fine wet and dry wrapped around a big wooden block to gently take the paint off. He said that a proper facing procedure would take too much material away and is not advisable unless the BB is in a bad state. Also, recently when I bought my wife's frame, the experienced LBS wrench said to just install the BB cups directly over it. The tiny bit of paint covering is inconsequential. Although I wasn't sure whether he was lazy and didn't want to do it for me or not.tallywhacker wrote:There is paint on the face and I was thinking that may be the best thing to do. Its just that you always read about having to face the bb.
Bianchi, Ridley, Tern, Montague and All things Apple
RK wrote:And that is Wikipedia - I can write my own definition.
- Mulger bill
- Super Mod
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- Location: Sunbury Vic
Postby Mulger bill » Sat Dec 22, 2007 12:09 am
If you had the BB shell faced before the powdercoat went on, it shouldn't be a problem, I doubt the coat would be uneven enough to throw it out.
The headtube? Sorry, no idea [guess]Maybe a bit of W&D to chamfer the inside edge slightly?[/guess]
Shaun
The headtube? Sorry, no idea [guess]Maybe a bit of W&D to chamfer the inside edge slightly?[/guess]
Shaun
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
London Boy 29/12/2011
London Boy 29/12/2011
- toolonglegs
- Posts: 15463
- Joined: Fri Jun 29, 2007 7:49 pm
- Location: Somewhere with padded walls and really big hills!
Postby toolonglegs » Sat Dec 22, 2007 8:18 am
the thing you need to be careful of is external bb bearings cracking the paint when they are done up.If it isn't external then wont be an issue.
A block with fine wet/dry would do a basic job otherwise find a local frame builder or a shop that has one.
A block with fine wet/dry would do a basic job otherwise find a local frame builder or a shop that has one.
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