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Shifter derailleur combination that works with 10 spd MTB cassette.

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Shifter derailleur combination that works with 10 spd MTB cassette.

Old 03-27-13, 11:50 AM
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rfields
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Shifter derailleur combination that works with 10 spd MTB cassette.

I'm building a carbon road bike that I want to use a mountain bike cassette and derailleur on, as we'll as an ultegra triple crank set. What combo of shifters and deraileurs will work?
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Old 03-27-13, 11:56 AM
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Your best bet is probably an older 9-speed Shimano MTB rear derailleur. The 10-speed Shimano MTB RD's have a different pull ratio. There's an Ultegra RD (6700A) that is spec'd for a 30T max ring that would almost certainly work with 32T, but for 34T or bigger I'd go with an old XT or XTR RD.
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Old 04-01-13, 10:14 AM
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rfields
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Thanks. I've ordered: 9 spd XT M772 shadow rear derailleur, CN6600 ultegra 10 spd chain, 10 spd 11-32 XT M771-10 cassette, ultegra 6700 triple front derailleur, Ultegra 6700 triple STI road shifters. When the rest of the parts arrive I'll report on how it performs.
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Old 04-01-13, 12:01 PM
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^ My question is why?

Ultegra 6700 with an 11-28 cassette works great, will shift better, and give tighter spacing.


And if you need a lower gear, you can address that by going to a smaller inner chainring.

When we did Everest Challenge on the tandem, we replaced the 30 inner chain ring with a 26.

And 26/28 is a lowe gear than 30/32. If that's not low enough for you, you can go to a 24 iner chainring.

Such a setup preserves tight spacing and crisp shifting.

The MTB Cog/Derailleur set up is usually a way to make a standard double go low.

With a triple, you have better, easier options.
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Old 04-01-13, 12:26 PM
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The 6700 triple has a BCD of 92mm on the inner chainring. You can't get a smaller chainring than a 30 for it.
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Old 04-01-13, 12:47 PM
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On my Pedal Force CG2, 6703 triple shifting in the front is amazing with 6703 shifters, 6703 front derailleur and 6703 52/39/30 crankset. Not so amazing when using a 105, FSA SL-K, with different sized 130mm/74mm rings and a 105 front derailleur. I've tried it a few times when I wanted to run 53/42/30 or 52/39/28. I've always used the older 10 speed 6600 chain as Shimano suggests with Triples.

Our tandem has a full 6703 setup but came with an IRD 11-32 cassette. That shifting sucked but worked and cleared the 32t cog with the 6703 rear derailleur. I swapped to an XT 11-32 cassette and had to reverse the B screw on the 6703 rear derailleur to get it to clear just barely in 30x32. I could have shortened the chain to pull more on the pulleys but prefer to run as long as possible (small small with the rear derailleur parallel and chain just brushing) in case I ever shift to 52x32 on accident. The XT cassette shifts amazing and I like the 11.12.14.16.18.20.22.25.28.32

I'd like to try the new 6700A that is designed for their 12-30 cassette.
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Old 04-01-13, 01:09 PM
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Originally Posted by svtmike View Post
The 6700 triple has a BCD of 92mm on the inner chainring. You can't get a smaller chainring than a 30 for it.
That's a stupid design. Limited to a 30 inner ring, and you don't get the flexibility of really low gearing options.

OP could go with a 6603.
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Old 04-01-13, 01:21 PM
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Originally Posted by merlinextraligh View Post
That's a stupid design. Limited to a 30 inner ring, and you don't get the flexibility of really low gearing options.

OP could go with a 6603.
Good luck finding one.

If he's going with 6703, and wants lower gearing than 30/30, then the mountain cassette/derailleur is the way to go.
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Old 04-01-13, 02:46 PM
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I don't have scientific data to back up but..

The Ultegra 6703 with the proprietary 92mm bcd for the 30t that screws into the 39t shifts fast, silly fast. Under load, anything. On both my singles with triples and our tandem. Is it because the larger bcd flexes less and mounts to a ring instead of the crank arm? Who knows.

Back in November when I climbed Haleakala on a rental Trek with 6603 components I noticed it. The rental shifted fine, was smooth. In fact the right shifting had the trademark velvet feel that everyone mentions went missing once Shimano went to hidden cables. The front shifting though was not the same as what I'm used to with the newer shifters, and I did a lot of switching back and forth from 30 to 39 upfront the 5 hours of that climb.
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Old 04-01-13, 04:54 PM
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Originally Posted by merlinextraligh View Post
That's a stupid design. Limited to a 30 inner ring, and you don't get the flexibility of really low gearing options.

OP could go with a 6603.
The entire Shimano road triple system is a stupid design. The front derailleur is designed to work with only one combination of chain rings, which isn't a good combination to begin with. If you want to use an MTB derailleur but have not purchased anything yet, go with SRAM. You can get an 11-36 ten speed cassette, and the road shifters are compatible with the 10 speed MTB rear mechs. However, they make all their road mechs in a long cage now, so there's really no reason you have to use aMTB stuff. Paired with a compact crank, you'll get lower gears than a triple unless you use an MTB crank. FWIW, I use an 12-32 10 speed cassette shifted with a regular 6700 Ultegra mech. Works just fine, though I have a 47-34 on the crank, so there is a little less chain for the rear mech to have to carry. Keep in mind that the capacity for a rear derailleur is a CYA sort of thing. The manufacturer is assuming you are using their stuff with a specific gear set up, and have to be conservative to allow for incorrect chain length and poor set up adjustments.
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Old 05-04-13, 06:22 PM
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OK, well I finally got around to finishing this build. XT rear shifter, 10 spd 11-32 XT cassette, Ultegra triple crank and front derailleur, and 9 spd Ultegra shifters. It all works flawlessly, even under load. Thank you to one and all for your advice and help with this project.
Oh btw, the Scott carbon frame is amazing!! I've owned steel, aluminum, titanium and carbon frames in MTB (rigid and FS) and road. I've been riding for 30 years and this is easily the most laterally stiff frame I've ever ridden....by far. High speed stability is unmatched in my experience.
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