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BB flange not cover shell completely

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BB flange not cover shell completely

Old 06-14-19, 09:26 AM
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BB flange not cover shell completely

this is a Sunrace BB. Flange only cover half the width of shell thickness.

should i look for a BB with bigger flange?
​​​​​​
or is it ok as is?



Last edited by mtb_addict; 06-14-19 at 09:31 AM.
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Old 06-14-19, 09:35 AM
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Originally Posted by mtb_addict View Post
should i look for a BB with bigger flange?
​​​​​​
I would.
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Old 06-14-19, 09:57 AM
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Originally Posted by AnkleWork View Post
I would.
btw the original VP has big flange.

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Old 06-14-19, 10:01 AM
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btw, i hate cartridge bb. the spevial tool is so easy to slip off. i had my left hand putting pressure on the tool to keep it from slipping off, but it slipped anyway...and my left finger got pinch by the wrench...now it hurt like crap.

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Old 06-14-19, 10:29 AM
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Another day, another weird thread. What's the actual, functional issue??
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Old 06-14-19, 11:06 AM
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Originally Posted by ThermionicScott View Post
Another day, another weird thread. What's the actual, functional issue??
i cannit predict the future...but it looks wrong to me.

at least this is a PSA. beware the different flange size when u order replacement BB.

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Old 06-14-19, 11:10 AM
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Originally Posted by mtb_addict View Post
i cannit predict the future...but it looks wrong to me. maybe it will never be a problem...but maybe it will back itself out...and cause a crash.

at least this is a PSA. beware the different flange size when u order replacement BB.
Looks like the shell needs to be faced before worrying about the flange.
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Old 06-14-19, 11:13 AM
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It's because its Aluminum .. they used a thicker tube wall shell ..

the look bothers you? apply black touch up paint..

must be a folding bike , seat tube is passing behind the BB, for seat post to come through...







...

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Old 06-14-19, 11:39 AM
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Originally Posted by mtb_addict View Post
i cannit predict the future...but it looks wrong to me. maybe it will never be a problem...but maybe it will back itself out...and cause a crash.

at least this is a PSA. beware the different flange size when u order replacement BB.
I'll answer your questions for you. The BB flange does not need to cover the BB shell. If you torqued it properly, it will not be any more likely to back out than if the BB shell metal were thinner. There's plenty of metal in contact. Think about it.

Cancel that PSA. There's no damn problem here.
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Old 06-14-19, 11:41 AM
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Originally Posted by AnkleWork View Post
Looks like the shell needs to be faced before worrying about the flange.
Even that is arguable. This is a cartridge square-taper BB, not an external BB of any type that would actually be sensitive to BB shell squareness. It'll torque down until it stops, and then do its job fine until it wears out.
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Old 06-14-19, 12:28 PM
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Originally Posted by ThermionicScott View Post
Even that is arguable. This is a cartridge square-taper BB, not an external BB of any type that would actually be sensitive to BB shell squareness. It'll torque down until it stops, and then do its job fine until it wears out.
Cartridge BBs have been known to bind due to poor facing; contemporary external BBs more so.
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Old 06-14-19, 12:46 PM
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i miss the original cup-n-cone bb. a much more robust design.
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Old 06-14-19, 01:53 PM
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Missing BBs?

Originally Posted by mtb_addict View Post
i miss the original cup-n-cone bb. a much more robust design.
Nothing to miss...they're still available!
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Old 06-14-19, 02:01 PM
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Here you go .. https://www.rivbike.com/collections/...6klsej-lkangkn

get out that Benjamin $C










/.....

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Old 06-14-19, 02:10 PM
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Originally Posted by AnkleWork View Post
Cartridge BBs have been known to bind due to poor facing; contemporary external BBs more so.
Maybe with some models. Not sure how it would be possible with a Shimano UN55 that has the whole assembly within a rigid shell that takes the pressure from installation. If the OP isn’t experiencing any bearing binding, it’s yet another “problem” that doesn’t need to be “fixed.”
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Old 06-14-19, 06:59 PM
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Originally Posted by mtb_addict View Post
btw, i hate cartridge bb. the spevial tool is so easy to slip off. i had my left hand putting pressure on the tool to keep it from slipping off, but it slipped anyway...and my left finger got pinch by the wrench...now it hurt like crap.
That's because you're doing it wrong. Go to the hardware store and buy a bolt of the correct thread for your spindle, long enough to thread in the spindle and through the tool and a washer. Bolt the tool into the cup so it doesn't slip, and crank away. Keep the bolt with the tool in your tool box.
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Old 06-14-19, 07:19 PM
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Originally Posted by ThermionicScott View Post
Maybe with some models. Not sure how it would be possible with a Shimano UN55 that has the whole assembly within a rigid shell that takes the pressure from installation. If the OP isn’t experiencing any bearing binding, it’s yet another “problem” that doesn’t need to be “fixed.”
Black/white thinking. Nothing is perfectly rigid, not even a UN55. Everything is both rigid and deformable by degrees. Eg: a thickwall BB shell may be more rigid than a thin-wall light weight cartridge.

Last edited by AnkleWork; 06-14-19 at 07:22 PM.
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Old 06-14-19, 07:35 PM
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Originally Posted by dedhed View Post
That's because you're doing it wrong. Go to the hardware store and buy a bolt of the correct thread for your spindle, long enough to thread in the spindle and through the tool and a washer. Bolt the tool into the cup so it doesn't slip, and crank away. Keep the bolt with the tool in your tool box.
I put a bar clamp across the BB, torque wrench, tool, and all; no need to hold the tool against the BB with your hand, which keeps it out of the line of fire and available to help hold the frame or push the wrench..
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Old 06-14-19, 07:45 PM
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Originally Posted by AnkleWork View Post
Black/white thinking.
Yep, either there's a problem or there's not. It could all be simple, but the OP is a worry-wort and some would rather feed this tendency than to help. Oh well.
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Old 06-14-19, 07:45 PM
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Originally Posted by AnkleWork View Post
Black/white thinking. Nothing is perfectly rigid, not even a UN55. Everything is both rigid and deformable by degrees. Eg: a thickwall BB shell may be more rigid than a thin-wall light weight cartridge.
+1. Even if black and white thinking is in vouge these days the world has an infinite shades of gray. Andy
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Old 06-14-19, 08:10 PM
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Originally Posted by dsbrantjr View Post
I put a bar clamp across the BB, torque wrench, tool, and all; no need to hold the tool against the BB with your hand, which keeps it out of the line of fire and available to help hold the frame or push the wrench..
i admit i was not being very smart. i was turning the bb the wrong direction. kept tightening it insyead of loosening. those left hand threads always throw me off.

and it was like 100 in the garage, which affected my judgement.

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