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Green grease on RD spring?

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Green grease on RD spring?

Old 10-21-13, 01:48 PM
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PatrickGSR94
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Green grease on RD spring?

I remember when my road bike was fairly new, there was a glob of translucent green grease on the RF spring. Well that grease is long since gone now (2,300 miles later) and I'm wondering do I need to put something else in there? The spring is pretty dirty right now. I'll be cleaning it all thoroughly when I install a new chain and cassette here in the next few days.
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Old 10-21-13, 02:09 PM
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I think the grease is there primarily to coat the spring to keep it from rusting. I have never put new grease on one, even after cleaning my derailleurs in a parts washer. I just give everything a bit of Tri-Flow or whatever thin lube I have. The one thing I do grease is the pulley bearings.
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Old 10-21-13, 02:14 PM
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You can grease it if you like , as techsensei stated it to keep the spring from rusting .
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Old 10-21-13, 02:17 PM
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I've never checked but I would be surprised to find that spring as any other material than stainless steel given its exposure to the elements. My bet is that the grease is there to lower the friction at the pivots and also to lower the friction between the coils of the spring and the derailler body. I believe they touch as the derailler pivots. Someone can correct me if I'm wrong on that last point as I don't have a derailler in hand to reference).
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Old 10-21-13, 02:43 PM
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It may depend on the DR but in the ones I have on MTBs and road bikes the spring touches only the pins each end of the spring is hooked to. I believe the grease is there excess to lubing this and the DR pivots. The only thing I do is periodically put a drop or two of medium weight machine oil on each of the DR parallelogram pivots.
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Old 10-21-13, 03:04 PM
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Originally Posted by joejack951 View Post
I've never checked but I would be surprised to find that spring as any other material than stainless steel given its exposure to the elements. My bet is that the grease is there to lower the friction at the pivots and also to lower the friction between the coils of the spring and the derailler body. I believe they touch as the derailler pivots. Someone can correct me if I'm wrong on that last point as I don't have a derailler in hand to reference).
If you're talking about the internal springs in the upper and lower bodies, they're usually high carbon spring steel, not stainless. Some are phosphated which helps prevent rust, but they really depend on the grease. The exposed springs are also high carbon (not stainless) but are often chrome plated for weather protection.

Stainless steel isn't as suited to springs as high carbon but it can be used, though I don't know offhand of anybody that does on bike parts.
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Old 10-21-13, 03:05 PM
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BTW, if you want to use the same "radioactive green" grease, it is Shimano Dura Ace grease.
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Old 10-22-13, 07:34 AM
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Originally Posted by FBinNY View Post
If you're talking about the internal springs in the upper and lower bodies, they're usually high carbon spring steel, not stainless. Some are phosphated which helps prevent rust, but they really depend on the grease. The exposed springs are also high carbon (not stainless) but are often chrome plated for weather protection.
I clearly should have checked a derailler before posting. And while I said I would be surprised about stainless not being used, I'm actually not surprised in the same way that I'm not surprised to see square wire springs used on bicycle parts. It is more efficient to use carbon steel than stainless.

Originally Posted by FBinNY View Post
Stainless steel isn't as suited to springs as high carbon but it can be used, though I don't know offhand of anybody that does on bike parts.
Carbon steel allows for higher stressed springs which means they can be lighter/smaller. Stainless is very commonly used for springs where that extra little bit of weight/size reduction and/or isn't as big a deal as the added corrosion resistance (I designed marine latches for a while and a steel spring would not have lasted a month in a salt water environment while 302 stainless springs go for years). But you may be right that no one uses stainless springs on bike parts. Again, I've never checked any brake caliper, shifter, or freehub springs.

If I wanted to play semantic games, I could argue that stainless "springs" as used for the spokes on wheels though
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Old 10-22-13, 04:42 PM
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Originally Posted by techsensei View Post
BTW, if you want to use the same "radioactive green" grease, it is Shimano Dura Ace grease.
Which is great stuff, but way expensive for this sort of application, IMO. I save my Shimano grease for wheel bearings, etc.
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