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Old 09-13-17, 05:27 PM   #1
Narhay 
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Hub cup pitting pattern

What would cause this pattern of wear on a cup and cone record hub? Non drive side rear, cone had the same pattern.



Not just marks, they have made grooves.
Hubs were greased with new balls and axles were spinning freely for 500km. Got into a rainstorm for 60km and when I pulled it apart this is what I found. I almost didn't repack the hub because it was still strangely spinning smooth and not binding. Opened it anyways and $60 later I had a new cup and cone on the way.

Last edited by Narhay; 09-13-17 at 09:34 PM.
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Old 09-13-17, 05:46 PM   #2
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I can't see your photo , my bet is some dirt or sand got into the hub and cost the damage .
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Old 09-13-17, 07:21 PM   #3
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Campy still follows the laws of physics. Steel embrittles under pressure, lack of lube hastens this. Andy
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Old 09-13-17, 07:25 PM   #4
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No picture but I can guess from the text.

If you saw a series of evenly spaced small circles or dots, matching in number the number of balls, it's that you put the hub away wet.

There's not much you can do about it, except to use good grease to prevent the problem. But the one thing ball bearings can't handle is being left alone. as long as you're riding the balls keep the races polished the same way passing trains keep rails from rusting. But when you put the bike away wet, the water collected around where the balls met the races, forming wet rings and accelerating rust formation in that pattern.

If the hub had some grease, the balls would have polished out any minor rust as soon as you started riding, and you would never have known.
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Old 09-13-17, 09:31 PM   #5
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Added photo

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Old 09-13-17, 09:40 PM   #6
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Added photo

As I suspected, corrosive damage from sitting around wet. Some greases are much better at preventing this than others, but the key is to make sure the bearing is packed with enough fresh grease.
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Old 09-13-17, 10:53 PM   #7
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Too bad. I had a bunch of marine trailer grease in there but I guess it wasn't where it was needed.
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Old 09-13-17, 11:02 PM   #8
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Too bad. I had a bunch of marine trailer grease in there but I guess it wasn't where it was needed.
Just curious. How long was the bike idle after the rain?

I ask because this isn't all that fast a process, so usually you're riding again and polishing the race before any damage is deep enough that it doesn't polish out.
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Old 09-13-17, 11:37 PM   #9
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Just curious. How long was the bike idle after the rain?

I ask because this isn't all that fast a process, so usually you're riding again and polishing the race before any damage is deep enough that it doesn't polish out.
Maybe 3 weeks, a month tops.
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Old 09-13-17, 11:43 PM   #10
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Maybe 3 weeks, a month tops.
That would do it. This is one of those things where the poor guy that gets caught in a big storm once ends up worse off than the guys who ride daily rain or shine.
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Old 09-13-17, 11:46 PM   #11
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That would do it. This is one of those things where the poor guy that gets caught in a big storm once ends up worse off than the guys who ride daily rain or shine.
June 17th was the ride, and I ordered the cup July 14th. I'd say I hummed and hawed about it for a couple days so roughly the right timeframe. At least I learned about rain and C&V bikes and how to remove and press in a new hub cup.
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Old 09-13-17, 11:52 PM   #12
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So is it actually ruined? The front hub races on my fixed-gear aren't very pretty either, but a repack every year (1-2000 miles) keeps the bike rolling.
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Old 09-13-17, 11:53 PM   #13
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June 17th was the ride, and I ordered the cup July 14th. I'd say I hummed and hawed about it for a couple days so roughly the right timeframe. At least I learned about rain and C&V bikes and how to remove and press in a new hub cup.
For future reference, Usually the damage isn't all that deep and smooths out somewhat when you ride, so there may be no noticeable difference when riding. Of course, the lost metal never grows back, so some the life expectancy is shorter.
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Old 09-13-17, 11:57 PM   #14
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So is it actually ruined? The front hub races on my fixed-gear aren't very pretty either, but a repack every year (1-2000 miles) keeps the bike rolling.
In the OP's shoes, I probably wouldn't have replaced the races. But my rule is that stuff you can feel off the bike, ie. spinning an axle in your fingers doesn't matter if it doesn't make a difference riding.

I'm slow to replace stuff that still has some life in it, and my rule is that no part is dead until I say it's dead.
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Old 09-14-17, 09:09 AM   #15
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Probably good to replace the balls & grease, after letting a set burnish the track smoother..

here, Pacific coast, I too, like to use Boat trailer wheel bearing grease..
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Old 09-14-17, 09:59 AM   #16
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You can feel the ruts on both the cone and cup so I replaced them. Maybe it could have polished out but it felt pretty deep. Im one of those that doesnt like to make do...it had better be the best condition it can be and that meant replacement. I'll ride the bike more and not put it away long term after any moisture contact. I wiped it down but I didn't open the bearings until the few weeks later.
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