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RD Shimano 10 5701 compatibility

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RD Shimano 10 5701 compatibility

Old 10-11-21, 04:26 AM
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dirtydozen
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RD Shimano 10 5701 compatibility

Hello,

I would like to replace my bent rear derailleur.
I bought my bike second hand from a bike shop, groupset is 105 5700.
I have a triple chainring (50/39/30) and a wide cassette (11-34).
Looking online it says it won't work with a cassette that goes above 28T or 30T with the long cage.
They also talk about a total capacity of 37T, which leaves me with 17T capacity on the rear, which is 11-28 and nothing more.

I mean surely i can't go wrong replacing the RD with the same model (right?), but on every website I go it says the RD is not compatible with my set up basically.
I've seen a comment from a guy that said he made it work with a 11-36.

Any ideas how to proceed ?
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Old 10-11-21, 10:27 AM
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shelbyfv
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I'd get the RD-M591. It is inexpensive but not junk like some of the "A" named models. Current production and readily available. It's nominally 9 speed but will work fine with your 10 speed road group. It will give you big cog and chain wrap headroom you won't have with a direct replacement of your current RD.

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Old 10-11-21, 02:44 PM
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^This^ Somewhere along the line someone with no clue worked on your bike. Put a 9 speed mtb derailleur on it like posted above and you won't have any problems.
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Old 10-11-21, 09:14 PM
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KCT1986
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Is the rear derailleur too bent to determine if it will have clearance for the 34T cog?

Another things to consider is; even if shifting isn't great to the 34T, with a triple, will you really use the 34T much?

The total capacity only comes into play if you expect to use extreme gear positions. If you size the chain for big/big, you'll get a lot of sag in the small/smaller rear cogs but again is this a combo that you will really need?
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Old 10-11-21, 10:39 PM
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Originally Posted by dirtydozen View Post
Any ideas how to proceed ?
All Shimano 9-speed derailleurs are compatible with their pre-2015 10-speed road drivetrains, so as people have suggested, I'd throw a 9-speed MTB derailleur at the problem and call it good.

The RD-M591 is probably the "highest-tier" widely-available model that would fit the bill.
The Alivio RD-T4000 "trekking" derailleur might also be a good option: it can often be sourced a bit cheaper, it's a smidge lighter, and it might fit the aesthetic of some road bikes a bit better.

There are various means of coaxing derailleurs designed for narrower-range drivetrains to work to some degree or another with wider-range drivetrains, but in this case a proper solution is readily available.

Last edited by HTupolev; 10-11-21 at 10:45 PM.
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Old 10-12-21, 11:25 AM
  #6  
dirtydozen
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Originally Posted by KCT1986 View Post
Is the rear derailleur too bent to determine if it will have clearance for the 34T cog?

Another things to consider is; even if shifting isn't great to the 34T, with a triple, will you really use the 34T much?

The total capacity only comes into play if you expect to use extreme gear positions. If you size the chain for big/big, you'll get a lot of sag in the small/smaller rear cogs but again is this a combo that you will really need?
I don't quite get the first question, but for the last 2, clearly no i'm not using that 34T cog ever.

Alright thanks for the tip guys. Never thought of putting a 9 speed RD, I thought i could only put 10 speed RD on a 10 speed cassette.
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Old 10-12-21, 11:37 AM
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I want to piggy-back on this thread, with apologies to the OP. It sounds like you Shimano drivetrain gurus are saying something that will help with my current question/problem.

Can I use any modern Shimano 8, 9, or 10 speed road or mountain derailleur (like the one suggested above, for example) with a Dura Ace 10 speed indexed bar end shifter and 10 speed Shimano/SRAM cassette?

I know there are tons of websites that lay out the cross-compatibility or lack thereof for almost any combination a guy would want to try, but they have so much information it can be hard to pick through and find an answer on my particular setup.
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Old 10-12-21, 12:15 PM
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Originally Posted by dirtydozen View Post
I don't quite get the first question, but for the last 2, clearly no i'm not using that 34T cog ever.

Alright thanks for the tip guys. Never thought of putting a 9 speed RD, I thought i could only put 10 speed RD on a 10 speed cassette.
The first question was meant to have you test to see if the RD has the ability to clear the 34T cog. Do it slowly while in the middle or small chainring just in case the chain was not sized to handle the large/large combo. The RD is rated to 32T with a triple per Shimano's spec and you're only 2T over. Depending on the specific dropout you have, it may have the range to clear the 34T. Additionally, cassettes are a wear item and will need replacement at some point. If you don't need a cassette with a 34T, when you do replace, get something smaller.

Saw your other thread, so after doing the new cable see if the RD can handle the 34T. While you have the cable out, also check the cable housing to verify that the housing ends are cleanly cut and the ferrules aren't damaged.

You may not have to replace the RD at all, especially if you don't use the 34T and don't plan to replace it with the same in the future.
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Old 10-12-21, 12:21 PM
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KCT1986
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Originally Posted by Broctoon View Post
I want to piggy-back on this thread, with apologies to the OP. It sounds like you Shimano drivetrain gurus are saying something that will help with my current question/problem.

Can I use any modern Shimano 8, 9, or 10 speed road or mountain derailleur (like the one suggested above, for example) with a Dura Ace 10 speed indexed bar end shifter and 10 speed Shimano/SRAM cassette?

I know there are tons of websites that lay out the cross-compatibility or lack thereof for almost any combination a guy would want to try, but they have so much information it can be hard to pick through and find an answer on my particular setup.
With 10 speed DA shifters, you can use any road Shimano 8 (except RD-74xx, which is different),9,10 RD (except RD-4700, which is also different). For MTB RDs, only 8,9 RD will work. Shimano changed the MTB RD for 10 speed.
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Old 10-12-21, 03:55 PM
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Originally Posted by KCT1986 View Post
With 10 speed DA shifters, you can use any road Shimano 8 (except RD-74xx, which is different),9,10 RD (except RD-4700, which is also different). For MTB RDs, only 8,9 RD will work. Shimano changed the MTB RD for 10 speed.
Thank you! Very helpful. This is exactly what I needed.
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Old 10-12-21, 04:24 PM
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Originally Posted by Broctoon View Post
Thank you! Very helpful. This is exactly what I needed.
Yes, lots of options will work. Just need to determine what capacity you need based on chainrings and cogs selection. Most of the current upper tier (DA, Ultegra, XTR, XT) RD are not compatible so you'll have to source something from a few year back, either used or NOS.
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Old 10-12-21, 06:54 PM
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Originally Posted by KCT1986 View Post
(except RD-4700, which is also different).
Not just 4700. Starting in 2015, any Shimano 10-speed road rear derailleurs match the new 11-speed road actuation. Currently that also includes the RD-RX400.
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Old 10-12-21, 07:43 PM
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KCT1986
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Originally Posted by HTupolev View Post
Not just 4700. Starting in 2015, any Shimano 10-speed road rear derailleurs match the new 11-speed road actuation. Currently that also includes the RD-RX400.
Yes, you're right about the RD-RX400, forgot about that one that was made to match up with the hydro braking shifters.

Otherwise, all of the new road upper tiers were going to 11 speed. For a few years, Shimano continued to sell the older 10 speed road lineup, (6700, 5700,4600{9S) series), which remained unchanged, with the older 1.7 actuation ratio.

Last edited by KCT1986; 10-13-21 at 01:16 AM. Reason: Corrected 4600
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Old 11-23-21, 07:24 AM
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Originally Posted by KCT1986 View Post
The first question was meant to have you test to see if the RD has the ability to clear the 34T cog. Do it slowly while in the middle or small chainring just in case the chain was not sized to handle the large/large combo. The RD is rated to 32T with a triple per Shimano's spec and you're only 2T over. Depending on the specific dropout you have, it may have the range to clear the 34T. Additionally, cassettes are a wear item and will need replacement at some point. If you don't need a cassette with a 34T, when you do replace, get something smaller.

Saw your other thread, so after doing the new cable see if the RD can handle the 34T. While you have the cable out, also check the cable housing to verify that the housing ends are cleanly cut and the ferrules aren't damaged.

You may not have to replace the RD at all, especially if you don't use the 34T and don't plan to replace it with the same in the future.
Thank you for your inputs on both my threads, I'm was quite busy to find time to fix my whole drivechain, but now that I do your replies are very valuable
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Old 11-24-21, 12:33 PM
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I have a 5701 rear derailleur. Here is a picture of it and the box. As you can see the max cassette cog is 30T. I bet a 32 would work easily. A 34T maybe with the B screw all the way in. Otherwise a Wolf tooth thingy would make it work.

There are a few tables comparing derailleurs and pull ratio. I can t find mine but I bet a 9 speed mountain derailleur has the same ratio as a road 10s. I do remember the 10s Shimano road and mountain are different. One needs a cable adapter to alter the ratio.

Oh. I went with this to replace a 10s Ultegra short cage so I could go with a larger cassette. I have a 12-30 but will try a x-34 for some light rail trail touring. Should have sold all the Ultegra parts and wai D until summer for a new proper bike.




Last edited by biker128pedal; 11-24-21 at 12:38 PM.
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