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Bottom bracket.

Old 07-22-11, 10:20 PM
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Bottom bracket.

Ok, so finally today i took apart my bb on my pinarello. It was the first time that i did it since i bought it last year, i've been riding it a lot more so i knew it had to be done. Anyways it came off kinda easy, and i just did the typical wipe down clean up and so on, then relube and put it back together. and it runs pretty good now.

anyways i got a few questions

1) what grease do you guys/gals usually use for redoing bottom brackets? i used this finish line beige grease with teflon, it seemed good? first time using it on a bike, i just use other stuff for my flips, but i had to buy something nice for my bike, or i hope it is? what do you guys use?

2) So i was sorta considering for future plans, or maybe now? BB replacement, i know there's the standard sealed UN54 BB from shimano which they do make in 115 lenth and for italian thread. But what would you guys suggest i do? i don't think i'd want that one, maybe something a little higher end for my bike, it's running 105 everything right now with brifters so i want something nice.

3) how long are these cup and cone systems supposed to last for? mine look pretty decent, there's no pitting or dents in the ball bearings and the cups look good, the only thing that scared me is there's two gouges taken out on one end of the axle, they're not deep but you can see them and feel them a bit, when i put it all back together it spun smooth but i noticed a little bump, when i went and put on the crank, you don't really notice it that much, but it's there. anyone on here go a nice replacement NOS axle? I saw that thread a while back about someone finding a box of axles and a box of cups and stuff, can't remember who it was. (the axle uses a screw to tighten the crank on, instead of a nut)





4) how tight is good? i usually tighten the cup on the side with the lockring until there's no play or pretty much no play, but it's usually at the point where i'm feeling less and less play then you get to that point where it's just right, but sometimes when you tighten to that just right point and spin the axle it doesn't feel amazingly smooth, but when i put the crank on you don't really notice it.
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Old 07-22-11, 11:23 PM
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Pits in the spindle... it's toast. Probably should get new balls too, so might as well get a whole unit. Harris Cyclery sells Phil Wood BBs if you want "expensive and bombproof", as opposed to the Shimano "pretty good plus cheap to replace" UN54.
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Old 07-23-11, 12:02 AM
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I’ve never seen marks like those, but that one is done. But, as long as you have the BB out and can’t ride it; I’d get a cartridge replacement BB. I’ve had it with cup and cones. If you can find a replacement spindle, and the cups look good, get some new bearings and good luck. C&C BB’s are going the way of the dinosaurs. Might as well capitulate now and buy a cartridge.

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Old 07-23-11, 12:24 AM
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campy is perfect for pinarello.
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Old 07-23-11, 05:31 AM
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Any pitting means that the race, or bearings, or both are shot. A pitted race, be it cup or cone, will damage ball bearings, during use, because the balls can fall into the pits. A pitted bearing is not as insidious, but it can split in half, causing rather rapid bottom bracket failure. Either way, the assembly needs attention.



Ball bearing adjustment spec is zero. There should be no clearance between balls and races, but there must always be clearance between balls and balls.

Achieving zero clearance, in a ball/race bearing assembly is bloody difficult to do! Why difficult? Because it is incredibly easy to go from zero clearance to pre-load! A pre-loaded bearing assembly is one that is over tightened, loading the bearings even before they come under normal operational loads. This will absolutely cause rapid wear!

So, even with many years of experience with setting up ball bearings, and cone bearings and roller bearings, and plain bearings. Wait a minute, I lost my bearings. Where was I! Oh ya...

With many years of professionally setting up ball bearings to engineered specs, I cheat. Simple as that! Bring the bearing to what feels like zero, which usually means one can feel the bearings starting to drag ever so slightly, and then back off just enough to eliminate the drag. This might take several attempts to achieve but stay with it until it is right. Perhaps looking through Bottom Bracket Rebuild will add something to what I have to say.

All of the above is for bottom bracket bearings, not quick release wheel bearings. They have a different enemy to deal with.

To the fellow or fellette who suggested a cartridge assembly - bang on the money, for someone who has little bottom bracket maintenance knowledge or skills.
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Old 07-23-11, 05:57 AM
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Its toast. Use the Shimano cartridge.
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Old 07-23-11, 10:32 AM
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i just found an identical NOS bottom bracket cup and cone for 50 bucks, it's 105 too. the only thing is that i'm debating if i should just go sealed, maybe even get the UN54 for now, but i HATE that plastic left cup they have that comes with it, you guys ever have an issue with it? plus that beige color for the cup looks gross too, i know they make alloy ones that you buy separately but i can't find ones for 70 mm, only seen 68

http://cgi.ebay.com/Shimano-UN54-UN2...#ht_1094wt_883

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Old 07-23-11, 10:57 AM
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Originally Posted by catonec View Post
campy is perfect for pinarello.
i'd love to use campy, but everything on the bike is matching shimano 105, from the hubs, to the cranks, derailleurs, brifters, bb, and headset, so it'd look funny with a campy crank on there with the campy bb, because you can't use campy with shimano correct?

also has anyone tried these?!?

http://cgi.ebay.com/IRD-QB-75-JIS-68...#ht_500wt_1094



just wondering if anyone has experience with these and how good they are?

i was thinking about getting this cartridge and retrofitting with these to fit mine:

http://cgi.ebay.com/IRD-QB-55-QB-75-...#ht_500wt_1094



thoughts anyone?

Last edited by mapleleafs-13; 07-23-11 at 11:15 AM.
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Old 07-23-11, 11:26 AM
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There are some cheaper options to replace just the axle.

http://www.google.com/search?q=botto...w=1680&bih=884

and you can get a whole set except the axle
http://www.amazon.com/Pyramid-Bottom...ef=pd_sim_sg_1

or just bearings

http://www.amazon.com/Pyramid-Bicycl...ef=pd_sim_sg_3

It's pretty simple and fun to maintain you old style BB.

Last edited by spock; 07-23-11 at 11:43 AM.
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Old 07-23-11, 12:38 PM
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WOOO HOO i think i just found my solution!!

http://cgi.ebay.com/New-Bottom-Brack...ht_1494wt_1144



probably gonna pick up a couple pairs since their cheap, i figure i know how to maintain the bb's so what the hell like spock said"

Originally Posted by spock View Post
It's pretty simple and fun to maintain you old style BB.
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