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upgrading to a sealed Bottom Bracket?

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upgrading to a sealed Bottom Bracket?

Old 08-30-05, 09:01 AM
  #1  
pgoat
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upgrading to a sealed Bottom Bracket?

Many of you will be familiar with (and probably sick to death of ) my 1986 Trek 500 I am messing around with.

I was digging through my parts stash and found a nice Shimano sealed BB (Model UN-52, marked 68 and BC 137x24 - I assume 68 is the mm width and 137x24 is the tpi?).

Can anyone tell me :

1) will this BB fit my Trek? Investment cast lugs on a Reynolds 531 main frame, original bb is a Hatta non-sealed. Do i just keep the drive side trek cup?

2) If it WILL fit, is this something you'd swap in? Immediately? next time you need to o/h the BB? Keep it just in case the original BB goes south? Never swap it in, just keep using the original?

3) If you WOULD use the sealed BB, anyone know a good source to get decent - but inexpensive crank bolts? The last time I bought two bolts at my lbs I paid like $9 each - ouch. Maybe Bikeparts USA? Third Hand?
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Old 08-30-05, 09:03 AM
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I should mention I just overhauled the original Hatta BB last weekend and it looked great. I just cleaned and repacked it with fresh Phil Wood grease. There certainly wouldn't appear to be any great weight savings with the UN52........
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Old 08-30-05, 09:07 AM
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Originally Posted by pgoat
Many of you will be familiar with (and probably sick to death of ) my 1986 Trek 500 I am messing around with.

I was digging through my parts stash and found a nice Shimano sealed BB (Model UN-52, marked 68 and BC 137x24 - I assume 68 is the mm width and 137x24 is the tpi?).

Can anyone tell me :

1) will this BB fit my Trek? Investment cast lugs on a Reynolds 531 main frame, original bb is a Hatta non-sealed. Do i just keep the drive side trek cup?

2) If it WILL fit, is this something you'd swap in? Immediately? next time you need to o/h the BB? Keep it just in case the original BB goes south? Never swap it in, just keep using the original?

3) If you WOULD use the sealed BB, anyone know a good source to get decent - but inexpensive crank bolts? The last time I bought two bolts at my lbs I paid like $9 each - ouch. Maybe Bikeparts USA? Third Hand?
Your trek is english thread.The BB is english.Spindle length end of taper to end of tpaer should match between what is used with old crank and new BB. A couple mm difference usually doesn't matter. To use the cartridge BB, you toss everything that is in the trek.Any LBS should have a box of old crank bolts for free or at best .50 to $1 each.
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Old 08-30-05, 09:54 AM
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That's what I figure re: the bolt cost......I didn't mind paying a couple of bucks to support my local LBS (especially since searches for such odd bike specific parts at hardware stores or the Home Depot are usually not worth the headache/time spent imo)....but $9 is a bit much even by NYC standards.


Would you say just keep the Hatta in there since I just O/H'd and toss in the sealed next year? I'm happy with the current BB and wouldn't have sought an upgrade there; just figured since I have it anyway, why not?
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Old 08-30-05, 11:01 AM
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I see no reason to replace the current BB just because you happen to have a cartridge unit sitting around. What benefit do you expect to realize by doing so? Other than freedom from a yearly lubrication task, I see no gain.

If the existing BB is no longer serviceable, then, by all means, replace it with a cartridge unit.
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Old 08-30-05, 09:06 PM
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Originally Posted by supcom
Other than freedom from a yearly lubrication task, I see no gain.

If the existing BB is no longer serviceable, then, by all means, replace it with a cartridge unit.

That's kinda what I was thinking. But next time I o/h I might try slipping the cartridge in for the hell of it.
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Old 08-30-05, 09:33 PM
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I would much rather have a good quality rebuildable BB in ANY of my bikes that this sealed bearing junk we have now!
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Old 08-31-05, 02:30 AM
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Originally Posted by pgoat
That's what I figure re: the bolt cost......I didn't mind paying a couple of bucks to support my local LBS (especially since searches for such odd bike specific parts at hardware stores or the Home Depot are usually not worth the headache/time spent imo)....but $9 is a bit much even by NYC standards.


Would you say just keep the Hatta in there since I just O/H'd and toss in the sealed next year? I'm happy with the current BB and wouldn't have sought an upgrade there; just figured since I have it anyway, why not?
$9 is cheap, go out and price some Campy bolts.


Tim
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Old 08-31-05, 07:30 AM
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I say go to sealed BB, especially if you are likely to ride in foul weather. A UN-52 is not lightweight but is extremely durable.

...A good quality rebuildable BB is one thing, the problem I had, before discovering sealed BBs was a lack of good quality parts. The very last discrete component BB I used lasted only 3 months of light duty commuting before the races & axle were pitted. Much of the problem was that there was nothing to keep water & particulate contamination out of the bearings. This situation invites accelerated wear and corrosion to set in.
The sealed unit that followed (a UN-52 in fact) gave over 3 years of smooth, trouble free service. For my application, riding in all weathers, there is no question of going back.

Just my 2p as they say,

Cheers,

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Old 08-31-05, 07:33 AM
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Originally Posted by cs1
$9 is cheap, go out and price some Campy bolts.


Tim
Likely only a fool would insist on campy bolts.
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Old 08-31-05, 08:47 AM
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Originally Posted by cs1
$9 is cheap, go out and price some Campy bolts.


Tim

actually that was for a campy record axle......hmmmm maybe not so bad at $9. I didn't TELL the guy that, just needed one bolt and brought in one to match (I bought two to have an extra).



I once needed to find a hex bolt for mounting a Modolo brake lever (pre aero) - I spent a few solid hours at hardware stores and Home Depots before I wised up ....... and used the bolt and retaining nut from a shimano lever!
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Old 08-31-05, 09:02 AM
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Originally Posted by pgoat
actually that was for a campy record axle......hmmmm maybe not so bad at $9.
Threads are the same as for a cheap sheet shimano.
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Old 08-31-05, 09:33 AM
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I know it didn't match what I had laying around - maybe they were weinmann or dia compe? can't recall for sure....all i know is they were cheap - and they worked. Point being as much as I hated paying $9 I also hated spending the better part of a day poking thru millions of drawers of screws.....course it helps to know beforehand what you need. Live and learn

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