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Old 11-19-05, 07:15 PM   #1
soni_guin
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SunTour Derailleur lubrication

Mine sticks in cold weather, so it's time to tear it apart and re-lube it (or is it time to throw the Trek out... err.. ebay it.. and get a Real bike..lol)

Are there any tricks/traps I should know about before I attack with the hex wrenches?
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Old 11-19-05, 07:54 PM   #2
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Hey, I have an '83 Trek 400 too! It's my rain bike and heavy as lead but I still like it. Mine has been upgraded a couple of times from my parts bins and still works well.

Your Sun Tour rear derailleur is 22 years old and wasn't top-of-the-line to begin with. Do you expect it to last forever? My guess it that the pivot wear is beyond simple clean and lube. Spend $20 and replace it with a new one.
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Old 11-19-05, 08:00 PM   #3
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What model is your Suntour derail? I would first try to spray the pivot joints with WD40 and see if that frees it up, then follow up about a week later with Finish Line Teflon Dry Plus or Triflow.

The derail may be 22 years old but that doesn't necessarily mean it's time for the bone yard. I have a 22 year old Suntour Superbe (on a Trek 660) derails on my ride and they still work fine with over 145,000 miles.
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Old 11-19-05, 08:12 PM   #4
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Maybe it's a 22 yo cable and casing at the RD?
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Old 11-19-05, 09:12 PM   #5
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the derail is a VX... the freewheel seems to be catching on something... It'll have to come off and the old 6 speed one will go back on for now.

guess it's time to start collecting Dura-Ace parts and a good frame and build my own...
I think I'll call it a Scuderia.
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Old 11-19-05, 09:30 PM   #6
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The Vx derail was a very good derail even though Suntour sold it as their mid range derail. The Vx derail outperformed ANYONE elses top of the line derails in it's day!!! And it lasted as long as the others top of the line! Those Vx derails can still be found NOS and NIB on E-Bay and they don't sell for much if it needed replacing which it doesn't sound like it does.
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Old 11-20-05, 08:15 AM   #7
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This Sun tour derailer uses a cable and a spring. The cable pulls it to the bigger sprokets, the spring to the smaller sprockets. the paralligram has to be oiled in order to be smooth , friction free, and fast. wd-40 is a penetrating oil and will work it's way down to the friction areas, but will over time evaporate and be gone. so use a thicker weight oil for all pivot points. use a needle applicater so as to not waste oil and make the derailler overly oily which will attract dust and dirt. Oil used properly can polish metal and also prevent rust in moving parts, to much oil and you just make a mess and attract grime. The Vx is a Great rear derailer and sounds like to me that it's time for some fresh cables and a clean chain too while your at it. cold weather is hard on bikes.
Use this time to overhaul your drive train. good luck!!
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Old 11-20-05, 09:17 AM   #8
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Quote:
Originally Posted by sydney
Maybe it's a 22 yo cable and casing at the RD?
+1 ........... or even a 2 yo cable.
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Old 11-20-05, 09:26 AM   #9
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Quote:
Originally Posted by soni_guin
Mine sticks in cold weather, so it's time to tear it apart and re-lube it (or is it time to throw the Trek out... err.. ebay it.. and get a Real bike..lol)

Are there any tricks/traps I should know about before I attack with the hex wrenches?
A VxGT derailleur. Tourists used to like them because, if you had one, you didn't have to bring along a mallet for pounding tent stakes into hard clay. That's a sturdy derailleur.

Grab the bottom of the cage and try to wiggle it laterally. If you can feel a significant amount of play, it's probably dead. If it still feels reasonably tight, and friction shifters will overcome a pretty sloppy derailleur, just clean it up the best that you can. When it comes time to lubricate all of the pivots just remember that it's impossible not to put on too much. Put the tiniest dot of lube that you can manage on each pivot, let it sit for 1/2 hour or so, then try to wipe off all of the lube that you just put on with a dry rag.
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