Need bigger GEARS
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  1. #1
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    Need bigger GEARS

    Would there be any downside to using a XT Di2 RD-M8050 Rear Derailleur on a road bike with a 34 cassette, it is rated for 11-42. I would need to get a 50-34 road? front derailuer to interface with the cranks.

    I just need more gears and thinking of building a 'mountain' road bike.
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  2. #2
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    Reputation: Srode's Avatar
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    An Ultegra GS 8050 will handle 11/36 easily on my RLT9 - If you are planning on using an 11/34 you wouldn't have any issues with that set up, don't need an XT RDR
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  3. #3
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    The one I listed is Di2, just released, 11 spd. So I guess I'll need a FD, chainrings, RD, shifters, etc.
    I guess a road 11 spd chain is the same as 11 spd mt?
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  4. #4
    Rub it............
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    How about also going sub-compact crank? 48/32?
    You can't fix stupid.

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  5. #5
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Quote Originally Posted by duriel View Post
    The one I listed is Di2, just released, 11 spd. So I guess I'll need a FD, chainrings, RD, shifters, etc.
    I guess a road 11 spd chain is the same as 11 spd mt?
    They're different.
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  6. #6
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    I got a Time CF that I'm thinking of turning into my Mountain Road bike.
    It has a road KForce FSA crank with standard BB (where you use the big wrench on the bearing caps).
    If I got a full Di2 MBike 11spd, could I put 50/34 11spd chainrings on it and use the clamp on Di2 MBike FD?

    The problem is I want to run 11/34. The chain delta is just too much now. The chain is very loose when I get in the small gears in the small ring. If I go subcrank, I don't think that is going to help this situation. I still want an 11 when I go down!!!!

    I guess I could get a new subcrank for my Pino and just change the crank/chain for the mts and run a 48/32? I looked at the Pino Di2 FD, and it looks like there might be some play to move it down a little, would it be enough? I don't know.
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  7. #7
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    Quote Originally Posted by duriel View Post
    I got a Time CF that I'm thinking of turning into my Mountain Road bike.
    It has a road KForce FSA crank with standard BB (where you use the big wrench on the bearing caps).
    If I got a full Di2 MBike 11spd, could I put 50/34 11spd chainrings on it and use the clamp on Di2 MBike FD?

    The problem is I want to run 11/34. The chain delta is just too much now. The chain is very loose when I get in the small gears in the small ring. If I go subcrank, I don't think that is going to help this situation. I still want an 11 when I go down!!!!

    I guess I could get a new subcrank for my Pino and just change the crank/chain for the mts and run a 48/32? I looked at the Pino Di2 FD, and it looks like there might be some play to move it down a little, would it be enough? I don't know.
    If you have an 8050 GS cage it shouldn't be a problem with the right length chain, that DR is supposed to handle an 11/34. With that rear you can also enable gear control in Etube to prevent small front and the 2 smallest rear combos or you can use full syncro-shift if you have one of the new batteries.
    Gravel Rocks

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    Trek Crockett

  8. #8
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    My road bike by design was a compact 50/34 Shimano 105 11 speed. I put XT Shimano cassette on it 40-11, (options would have allowed me up to an 11 speed 46 cassette) and added a Tanpan plus the appropriate XT Shimano MB rear derailleur. There was no need to change the front derailleur.

    I've ridden many miles and climbs of a whole variety of grades and the bike shifts fine.
    Last edited by GlobalGuy; 03-28-2019 at 08:28 PM.

  9. #9
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    Quote Originally Posted by duriel View Post
    I got a Time CF that I'm thinking of turning into my Mountain Road bike.
    It has a road KForce FSA crank with standard BB (where you use the big wrench on the bearing caps).
    If I got a full Di2 MBike 11spd, could I put 50/34 11spd chainrings on it and use the clamp on Di2 MBike FD?

    The problem is I want to run 11/34. The chain delta is just too much now. The chain is very loose when I get in the small gears in the small ring. If I go subcrank, I don't think that is going to help this situation. I still want an 11 when I go down!!!!

    I guess I could get a new subcrank for my Pino and just change the crank/chain for the mts and run a 48/32? I looked at the Pino Di2 FD, and it looks like there might be some play to move it down a little, would it be enough? I don't know.
    No, you can't put 50/34 on the mtb crank. And you need smaller gears not bigger. You mean bigger cogs.
    I work for some bike racers
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    and a bunch of skateboards

  10. #10
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    I was thinking using a RCrank & RDi2FD & Rbrakes, Rwheels and cassette, MDi2RD.
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