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Road/MTB Drivetrain Compatibility Again

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Road/MTB Drivetrain Compatibility Again

Old 02-17-19, 01:09 PM
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Road/MTB Drivetrain Compatibility Again

Building a Niner One 9 into a gravel bike and need to make decisions on drivetrain. I want to run either Shimano 10 or 11 speed road shifters with an XT rear mech and a 11-34 or 11-38 cassette.

If I run 10 speed STI's and cassette, I THINK I read that I should go with a 9 speed rear mech. Need to confirm this.

If I run 11 speed STI's and cassette, I'm not sure what MTB rear mech would work most effectively. I have a spare set of Ultegra STI's I wouldn't mind using.

Other issues I should be thinking of?

Thank you all....

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Old 02-17-19, 01:18 PM
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Leave the Road Front derailleur on ... then .....


feeling a need for those 2 more cogs stacked on the back wheel ,
puts you in the divergent incompatibility the engineers created..


I'm old , on the Coast and very trend monger resistant ,
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Old 02-17-19, 01:21 PM
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Originally Posted by fietsbob View Post
I'm old , on the Coast...
I'm pushing 60 and currently sitting in a home overlooking the ocean in Yachats.

I don't need the extra gears. Could easily go with 9. It's just that I have a set of DA 10 speed STI's and Ultegra 11's sitting around and figured I'd use one of them.
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Old 02-17-19, 01:30 PM
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On the basis you are going to buy new

10 speed, your limited to Tiagra (4700, expect this to be replaced later this year) which you can do 11-34 out the box

For older 10 speed (5700/6700) you can fit a M591 RD, which is a pretty universal RD for what it can take.

11 spped, R7000 and R8000, again you can do 11-34 out the box, and have a clutch RD (RX800). Since MTB Dyna-SYS started at the 10 speed level there has been no compatibility between MTB and Road shifters and RD's

Going to 11-38 your be looking at road-links/similar to add the the RD capacity, as you can get 11-34 out the box, thinking that going for a CX/subcompact at the front would probably be a better option.

You say you have a spare set Ultegra STI's, without knowing the series, these are ignored, but slot them into the above.
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Old 02-17-19, 01:34 PM
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Thanks Jim - the Ultegra series I have is 6800.
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Old 02-17-19, 01:58 PM
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The 6800 STI's should have no issues working with an 11-34 cassette (CS-R8000) you will need a medium cage RD. or the clutch as noted above.
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Old 02-17-19, 02:34 PM
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I'm pushing 60
71 .. last year ..

Small house by the Columbia..







....

Last edited by fietsbob; 02-17-19 at 02:37 PM.
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Old 02-17-19, 02:39 PM
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RX800 GS + 11-34 cassette = plug-and-play, no fiddling or adapters. Maybe 38T or a 40T narrow-wide up front, depending on your terrain? And the RD is clutched, so even better. Hook the unused front shifter up to a dropper and you're cruisin'.
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