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  1. #1
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    8, 9, 10 speed rear derailleur derailer

    I hate to ask this common question. I know it has been discussed, and I have failed to find it searching the forums. Hence the title.


    I have an older Trek road bike with an 8 speed Shimano RSX rear derailer that is starting to malfunction, and I want to upgrade it as much as possible when I replace it this weekend. I would like to convert to a 9 or 10 speed rear cassette, but right now all I can afford is a rear derailer and possibly a chain (pedicabing is slowing down this time of year in Austin). What do you suggest?


    Oh yea, the front is a tripple, but I would like to have a double. So if you want to recomend something with that in mind please do so, even if it means just taking off or not using the small chain ring.

  2. #2
    Senior Member capwater's Avatar
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    Get yerself something like a 105 level RD RD-5501, damn cheap and super good quality. It'll work with your 8 speed group.

  3. #3
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    thanks, very precise and exact.

    I guess that means a 10 speed RD will not work?

  4. #4
    semifreddo amartuerer 'nother's Avatar
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    Any relatively modern rear derailleur will work with 8, 9 or 10s. I'm taking a guess that capwater suggested the 105 because it's relatively inexpensive and is bulletproof. It's not the only thing that will work, though. A 10s RD will work fine too, but it's likely to cost you more for no additional benefit.

    What problem(s) are you having with your current RD that you need to replace it?


    Edit: You mention you have triple up front, so you are going to need a long-cage RD.
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  5. #5
    Senior Member barba's Avatar
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    The RD is the least of your concerns jumping up to 9 or 10 speed. Are you sure it is the RD that is not working? It could be the shifter.

  6. #6
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    It is ghost shifting from low to high in the middle four or five cogs. The chain will stay in whatever gear I choose while the bike is on a stand, but once a load is put on it or I hit a bump, it slips to the next lowest gear. I looked at it after my last ride, and the arm seems loose, like the big spring behind the name plate (don't know the exact name) is worn out. I have not tried, but I just can't imagine it tightening up.

    I don't think it is the shifter. The shifter for the tripple is starting to act up also, but this is a totally different feeling. I mean, it just sticks in the higher gear until I push in the shift lever enough times for it to catch. The problem in the rear is not with finding the gears or moving between them, but staying in one once it gets there.

    Before the last race (informal street race) I entered, A friend of mine, who is a respected bike mechanic in Austin, tuned it up. He told me that I would need to start replacing most of the components soon, but was not specific about which ones.

  7. #7
    semifreddo amartuerer 'nother's Avatar
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    Hard to say conclusively but it sounds like it could just be an adjustment problem, or possibly just worn/damaged cables (or all of the above).

    Have you had a look at Park Tool's info on RD adjustment? I would give that a shot before you lay out any cash. Another thing would be to take it to a local shop and have them check whether the derailleur hanger is bent (this is not something you can easily do yourself, but most shops have the proper tools and can do it quickly & cheap).
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  8. #8
    Senior Member grolby's Avatar
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    Chances are that your derailer is fine. Check 'nother's post, above.

    And keep the triple. Use it with pride. If you're USING the small ring, then you need it! That's nothing to be ashamed of. If your riding club is giving you crap because you have three rings, it's time to find a new club. Besides, it's never cost effective to "upgrade" (actually a downgrade) from a triple to a double. Ever. The time for a new crankset is when you buy a new bike.
    ISO: used, working Shimano 10-speed shifters/groups (6600, 6700, 7800, 7900). PM por favor.

  9. #9
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    Cool. Thanks for the link to the Park Tools RD adjustment. I'll check that out.

    Grolby, I'm glad to see that you support people's choice in what they ride, but I simply want to remove the tripple because I don't use the small ring. I don't have a riding club. Most of the clubs want me to put on a helmet, and I don't want to while a helmet law is being debated in this city. More so, I would not have a riding club that gave me a hard time about my bike, and most of the clubs around here support the helmet law. Further more on the tripple discussion, I really want to put the tripple and any other salvageable 8 speed parts on the touring frame, which I have not touched since I pulled it out of the dumpster.

    Back to the question at hand...
    If I need cables I'll get them, but now that I have my girlfriend conviced that I need bike parts, I intend to spend some money on my bike.

    Is the 105 RD the best way to go? I'm planning on racing my bike on the schools team next semester, and I would like to get the best thing that I can get. On the other hand I make a 70 mile commute one day a week, so I do need some durability. Any more recomendations? How do the SRAM RDs compare to the 105 and Ultegra RDs? Weight? Durability? Performance?

    Should I ask on the roadie forums?

  10. #10
    semifreddo amartuerer 'nother's Avatar
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    Quote Originally Posted by PhucNguyen57
    If I need cables I'll get them, but now that I have my girlfriend conviced that I need bike parts, I intend to spend some money on my bike.

    Is the 105 RD the best way to go? I'm planning on racing my bike on the schools team next semester, and I would like to get the best thing that I can get. On the other hand I make a 70 mile commute one day a week, so I do need some durability. Any more recomendations? How do the SRAM RDs compare to the 105 and Ultegra RDs? Weight? Durability? Performance?

    Should I ask on the roadie forums?
    Hard to say if the 105 is the "best" way to go, but it'll certainly work just fine. For more $$$ and bling-factor and slightly less weight, you could go with Ultegra if it turns out you really do need a new derailleur. Of course, "the best you can get", Shimano, anyway, is Dura-Ace but personally I'd have a hard time justifying that. Even the Ultegra is a bit of a stretch. Maybe look for a used one, sometimes shops will have them they'll sell ya for cheap, ask around.

    Most (all?) SRAM RDs are incompatible with Shimano shifters. I know for certain that their road groups (Force & Rival) will not work with Shimano shifters. Maybe some of their MTB stuff will but better double check any specific one you're interested in.
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