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Shimano Ultegra 10 spd crankset compatibility with a 7 spd drive train...

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Shimano Ultegra 10 spd crankset compatibility with a 7 spd drive train...

Old 01-29-20, 12:45 PM
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Shimano Ultegra 10 spd crankset compatibility with a 7 spd drive train...

Any of you try a newer Shimano 10 speed compact crankset (Ultegra) paired with a 7 spd Shimano compatible rear? It would be all friction shifting?

I also asked this on my project thread and didn't know if anyone saw the question.
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Old 01-29-20, 01:33 PM
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Originally Posted by mechanicmatt View Post
Any of you try a newer Shimano 10 speed compact crankset (Ultegra) paired with a 7 spd Shimano compatible rear? It would be all friction shifting?

I also asked this on my project thread and didn't know if anyone saw the question.
I don't think the rd has much of anything to do with this. I'm assuming your fd will be friction as well? I can't imagine this wouldn't work, even with a 7s chain.

edit: don't forget to Google in the future: https://www.bikeforums.net/bicycle-m...rivetrain.html
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Old 01-29-20, 01:52 PM
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Mechanically, it should work just fine. Aesthetically, they may be incompatible.
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Old 01-29-20, 01:58 PM
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Originally Posted by Andy_K View Post
Mechanically, it should work just fine. Aesthetically, they may be incompatible.
, it's what I have though.
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Old 01-29-20, 02:04 PM
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I think it would work fine. I’ve used a Velo Orange compact crank (I believe designed for 10 speed ) with a 6 speed friction setup without problems. I use 8 speed chains on all my 6 thru 8 speed bikes.
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Old 01-29-20, 03:00 PM
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I use a Velo Orange compact crank with a 6 speed Shimano 600 Arabesque group and an 8 speed KMC chain. The Velo Orange crankset is 10 spd compatible so it has more narrow spacing between the rings. I bring this up because the front derailleur is pretty finicky when shifting to the big ring. If I shift too fast, the chain will bind mid shift between the rings. Not sure if this is due to the wider 8 speed chain or the Arabesque FD trying to handle the small-to-big walk on the compact crank. I’m using the appropriate VO BB but I suppose the chainline could be a contributor as well.

Bonus data point: The previous crankset was a Dura Ace 7400 7spd crank (not compact). All other parts remained the same (after resizing the chain) and the FD upshifted just fine.

Assuming OP is using a 7spd FD, I’d think there is a chance you might run into a similar issue. Not a show stopper IMO, just need to modulate FD upshift accordingly.
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Old 01-29-20, 04:13 PM
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Originally Posted by plonz View Post
I use a Velo Orange compact crank with a 6 speed Shimano 600 Arabesque group and an 8 speed KMC chain. The Velo Orange crankset is 10 spd compatible so it has more narrow spacing between the rings. I bring this up because the front derailleur is pretty finicky when shifting to the big ring. If I shift too fast, the chain will bind mid shift between the rings. Not sure if this is due to the wider 8 speed chain or the Arabesque FD trying to handle the small-to-big walk on the compact crank. Im using the appropriate VO BB but I suppose the chainline could be a contributor as well.

Bonus data point: The previous crankset was a Dura Ace 7400 7spd crank (not compact). All other parts remained the same (after resizing the chain) and the FD upshifted just fine.

Assuming OP is using a 7spd FD, Id think there is a chance you might run into a similar issue. Not a show stopper IMO, just need to modulate FD upshift accordingly.
Actually I've had a lot of luck with 7spd front derailleurs with 9 and 10 spd setup. I was just worried a 7 spd chain wouldn't work with the crankset.
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Old 01-29-20, 04:52 PM
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Originally Posted by mechanicmatt View Post
, it's what I have though.
would you like a 7sp crankset and bb?
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Old 01-29-20, 05:02 PM
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Originally Posted by RobbieTunes View Post
would you like a 7sp crankset and bb?
I have some I just don't have a compact or triple with a low gear. I'm trying to put something together for the climbing around here. Appreciate the offer.
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Old 01-29-20, 05:22 PM
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This is what I have to work with.

Everything I have to work with. A nice Campy Strada crank but it may be the only campy components I have. Shimano 600 that I can convert to 52-39 rings. Sugino Impel mtb crankset that have a bcd less than 110bcd, I'd have to scavenge for chainrings for it. Some Bulletproof branded 110bcd crank that I think may be meant for single speed setups, got it extra in a trade. Then the Shimano compact crankset that I'm talking about. Lastly a bunch of chainrings.



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Old 01-29-20, 05:25 PM
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Originally Posted by mechanicmatt View Post
I have some I just don't have a compact or triple with a low gear. I'm trying to put something together for the climbing around here. Appreciate the offer.
I can still "go there." 3x7 compact triple. Square taper....
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Old 01-29-20, 05:25 PM
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And it's going on this...

...what would you put on this bike?

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Old 01-29-20, 05:29 PM
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Originally Posted by mechanicmatt View Post
...what would you put on this bike?

6sp. Freewheel, 3x7 RSX compact triple cranks, Suntour Mountech FD, long cage DA 7400 RD, 2/3x6 DA downtube shifters set to friction, or 7sp freewheel, 2/3x7 105 downtube shifters, pick an RD.

PM implied.
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Old 01-29-20, 05:40 PM
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Originally Posted by RobbieTunes View Post
6sp. Freewheel, 3x7 RSX compact triple cranks, Suntour Mountech FD, long cage DA 7400 RD, 2/3x6 DA downtube shifters set to friction, or 7sp freewheel, 2/3x7 105 downtube shifters, pick an RD.

PM implied.
Thanks Robbietunes. I'll PM later. I only need a crankset. I have plenty of derailleurs long and short, shifters will be Suntour barcons, I may change the levers out to Shimano with cables coming out of the top. I want to build this up for the Cino and I'm just not using the Shimano compact because it doesn't look right. That's a seven speed rear, Sunrace 13-28 that I will be using.
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Old 01-29-20, 05:42 PM
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Originally Posted by mechanicmatt View Post
Any of you try a newer Shimano 10 speed compact crankset (Ultegra) paired with a 7 spd Shimano compatible rear? It would be all friction shifting?

I also asked this on my project thread and didn't know if anyone saw the question.
I have the MTB variant of this: 7 sp XT hub, thumb shifters, and front derailleur with 7 cogs off an 8 sp SRAM cassette, 9 sp chain, and a 10 sp SLX crankset.



Similar is this tricolor derailleurs with 8sp XT cassette, 8 sp Shimano chain and 11sp GRX crankset.
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Old 01-29-20, 06:02 PM
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Originally Posted by DorkDisk View Post
I have the MTB variant of this: 7 sp XT hub, thumb shifters, and front derailleur with 7 cogs off an 8 sp SRAM cassette, 9 sp chain, and a 10 sp SLX crankset.



Similar is this tricolor derailleurs with 8sp XT cassette, 8 sp Shimano chain and 11sp GRX crankset.
Perfect! that's the kind of proof i was looking for.
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Old 01-30-20, 07:34 AM
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i couldn't not comment on your workbench. New? Pretty cool.
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Old 01-30-20, 09:03 AM
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110 bcd cranks for vintage bikes are fairly inexpensive and easy to find if you are willing to use a 110/74 bcd triple and use only the 2 outer rings.
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Old 01-30-20, 06:53 PM
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Originally Posted by Classtime View Post
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i couldn't not comment on your workbench. New? Pretty cool.
Thanks, It's new I guess, I'm working on it. It's basically done, the other tool cabinet to go in is full of tools so I will wait to put that in when I move it to it final resting place. Lots of wood leftovers were used to build.

Current state:

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Old 01-31-20, 09:40 PM
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Originally Posted by mechanicmatt View Post
Perfect! that's the kind of proof i was looking for.
Just remember, it's the 8 speed cogs that allow the chain to work properly with the crank.
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