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Shimano 105 5800 crankset compatibility

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Shimano 105 5800 crankset compatibility

Old 10-05-18, 02:28 PM
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bassman54
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Shimano 105 5800 crankset compatibility

Greetings, new to the forums.

I'm not a racer, just a recreational rider who likes to tweak.

I'm building up a Specialized Allez frame with Shimano 105 components. I've discovered that Shimano has introduced the 105 7000 series, replacing the 105 5800 series.

I want to use the newest technology but I already have a 5800 crankset, 50x34 with 175mm arm length.

My question is does anyone know if the 5800 crank (the chaniwheel spacing has apparently been changed on the 7000) is compatible with the new 7000 derailleur/shifter combo, or will I have to bite the bullet and purchase a new crankset? Or can someone point me to the answer?

Thanks in advance
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Old 10-05-18, 05:38 PM
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DOS
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As I understand it, your cranks will work. For their new groupsets, Shimano moved chainrings a bit inboard so a 7000 crankset might not work with a 5800 derailleur. But the 5800 crankset should do fine with the new derailleur. At least I hope so because I am considering swapping out my 6800 fd for the new 8000 because I hear it shifts better the long arm design pf 6800.
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Old 10-06-18, 08:51 PM
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Le Mechanic
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Yeah, all the shimano 11 speed stuff is backwards compatible. Depending on your year model allez, you may need an adapter or special BB if the frame is set up for a 30mm diameter spindle to run the shimano's 24mm diameter spindle.
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Old 10-08-18, 09:33 AM
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bassman54
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Originally Posted by Le Mechanic View Post
Yeah, all the shimano 11 speed stuff is backwards compatible. Depending on your year model allez, you may need an adapter or special BB if the frame is set up for a 30mm diameter spindle to run the shimano's 24mm diameter spindle.
Thanks. I have a Praxis adapter installed, and the crank is installed.
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Old 10-08-18, 09:35 AM
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Originally Posted by DOS View Post
As I understand it, your cranks will work. For their new groupsets, Shimano moved chainrings a bit inboard so a 7000 crankset might not work with a 5800 derailleur. But the 5800 crankset should do fine with the new derailleur. At least I hope so because I am considering swapping out my 6800 fd for the new 8000 because I hear it shifts better the long arm design pf 6800.
That is good news. I was hoping that was the case as well. I guess we'll find out together!
Thanks for the reply.
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