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Which Shimano (10s comp.) road rear derailleur has the highest spring tension

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Which Shimano (10s comp.) road rear derailleur has the highest spring tension

Old 03-21-16, 11:48 AM
  #1  
Erik_A
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Which Shimano (10s comp.) road rear derailleur has the highest spring tension

What is the model of Shimano 10s road rear derailleur with highest spring tension, that also fits a 11-32 cassette un-officially (with normal, longer non-Campy derailleur hangers)?

I am done with SRAM shifters, and want to run 10 speed Shimano road shifters on my cyclocross bike.

One of Shimano's neutral support mechanics at an event earlier this year recommended the Ultegra RD-6700. I have also heard that the 105 RD-5701 has a stronger spring than the previous 5700 version. What about Dura-Ace RD-7900?
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Old 03-21-16, 12:53 PM
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there are 3 springs .. in a RD.
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Old 03-21-16, 01:15 PM
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Originally Posted by fietsbob View Post
there are 3 springs .. in a RD.
The highest total amount of spring tension that would prevent chain slap and dropped chains.
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Old 03-21-16, 01:25 PM
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I'd go with the 6700 suggestion. Though you might also consider 4700-GS. If you are replacing RD and shifters anyway, just add the FD for nicer shifting in the front and a system that officially goes to 32t in the rear.
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Old 03-21-16, 01:30 PM
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so that would be the lower cage chain slack wrap spring

not the one around the mounting Bolt or the one the shift cable pulls against ..


prevent chain slap and dropped chains

Prevent? Dream On ..
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Old 03-21-16, 01:37 PM
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It sounds like you want a clutched rear derailleur, which are made for MTBs. Shimano's "Shadow plus" and SRAM's "Type 2" MTB RDs have a clutch, and they work well. And, they offer models with longer cages that can handle larger cassettes.

Unfortunately, neither of these MTB RD lines is naturally compatible with Shimano 10-speed road shifters.

You can add a pull-translation device (like the Jtek Shiftmate 6 or the upcoming Wolftooth/Lindarets Tanpan SH10) to mate the Shimano 10s MTB RD to the Shimano 10s road shifters.

Or, you can use SRAM 10s road shifters and a SRAM 10s MTB RD; they do work perfectly together (but not for SRAM 11s, unfortunately).
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Old 03-21-16, 02:09 PM
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Originally Posted by dtrain View Post
I'd go with the 6700 suggestion. Though you might also consider 4700-GS. If you are replacing RD and shifters anyway, just add the FD for nicer shifting in the front and a system that officially goes to 32t in the rear.
Tiagra 4700 are NOT compatible with other 10-speed shifter/derailluers. They use the same geometry and cable ratios as Shimano 11-speed (but with 10-speed shifting instead of 11).
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Old 03-21-16, 02:20 PM
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Originally Posted by gsa103 View Post
Tiagra 4700 are NOT compatible with other 10-speed shifter/derailluers. They use the same geometry and cable ratios as Shimano 11-speed (but with 10-speed shifting instead of 11).
That's correct - and an important clarification. I was suggesting the 4700 GS RD with 4700 STIs and a 4700 (or 5800) FD. I wrote only "since you are replacing RD and shifters" - but that's not clear writing on my part (and I should know better ).

If the OP doesn't have 5700 (or whatever) 10-speed Shimano STIs already, he might consider a 4700 mini-group.
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Old 03-21-16, 02:33 PM
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Thanks - I have the 5700 shifters already.

Originally Posted by dtrain View Post
That's correct - and an important clarification. I was suggesting the 4700 GS RD with 4700 STIs and a 4700 (or 5800) FD. I wrote only "since you are replacing RD and shifters" - but that's not clear writing on my part (and I should know better ).

If the OP doesn't have 5700 (or whatever) 10-speed Shimano STIs already, he might consider a 4700 mini-group.
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Old 03-21-16, 02:47 PM
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^ prefect. Ignore my 4700 nonsense then.

I know that one benefit of the 5701 (or is it 5701-A?) is that it's rated to 30t. I think 6700 or 7900 are only 28t. I don't know if that would change the spring strength for either design...but the 32t would be less of a stretch for the right 5700 unit.
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Old 03-21-16, 03:42 PM
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If it's rated for 30t then 32 should be no problem.

Shimano is notorious for understating capacities...
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Old 03-21-16, 03:42 PM
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Originally Posted by fietsbob View Post
there are 3 springs .. in a RD.
How many in a mech..?
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Old 03-21-16, 03:44 PM
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Originally Posted by Erik_A View Post
The highest total amount of spring tension that would prevent chain slap and dropped chains.
Chain slap is a fact of life in cyclocross that I solve by wrapping an old tube around the chainstay as a protector. It also kills almost all of the noise.

As far as dropped chains are concerned, I haven't dropped a chain on my 'cross bike since I switched to a single front chainring and added a Paul chain keeper. A single-speed specific chainring is highly recommended but not completely necessary.

I use standard Shimano road/MTB rear derailers.
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Old 03-21-16, 05:11 PM
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How many in a mech..?
Old Campag Rear mech's only had 2(A) 813/A wrap up chain slack and(B) 98/A, pull back against the shift cable

# 3459 Rally added (C) 3458, it spring loads the mounting bolt and the upper body..

Ref: Old <C> catalog

most current ones do similar ..

Mountech added another one ..it had some up down on a 2nd pivot to more closely have the guide pulley follow the
wider range gear (speeds) cluster.

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Old 03-22-16, 09:44 AM
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Surprised nobody has mentioned this yet, but most Shimano RDs have more than one hole for the cage tension spring.

Whatever you end up using you might want to check for this and make sure yours is set for maximum...
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Old 03-22-16, 10:20 AM
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I'm going to recommend Gevenalle. They take a Microshift derailleur (Shimano 10s compatible), upgrade the pulleys, and increase the spring tension. And they have a crash replacement program that covers ANY damage CX can throw at your RD.

There are a lot of CX rigs here in Portland that are running the Gevenalle BURD. I have one with FSA ceramic pulleys that replaced my second Ultegra RD. The Ultegras each lasted a season, my Gevenalle has lasted three so far, and my son's has lasted two full seasons.

Full disclosure: Gevenalle is one of the sponsors of the team that I am on. I actually bought all of my stuff from him before I joined the team. I spend a fair amount of time at CX races in their tent, and I don't recall seeing someone come into the tent with a busted Gevenalle RD. Many, many others, but not one of theirs.

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Old 03-22-16, 07:36 PM
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Why not just run a MTB Shadow+ RD, one with a clutch. You can get a Tanpan to fix the shifting mismatch between the shifter and RD Tanpan ? wolftoothcomponents.com
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