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Compatibility: Shimano ST-RS505 shifters with Ultegra r800 front and rear derailleurs

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Compatibility: Shimano ST-RS505 shifters with Ultegra r800 front and rear derailleurs

Old 02-11-18, 02:11 PM
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dmuro2
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Compatibility: Shimano ST-RS505 shifters with Ultegra r800 front and rear derailleurs

Howdy, first time posting.

I have a 2017 BMC Roadmachine 02 that came with Shimano 105s (5800 series) all the way around. For Christmas, I got new Shimano Ultegra r8000 front and rear derailleurs, but have heard conflicting views on compatibility with the ST-RS505 shifters.

Does anyone here know if they're compatible?

Thanks in Advance.
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Old 02-11-18, 02:32 PM
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Originally Posted by dmuro2 View Post
Howdy, first time posting.

I have a 2017 BMC Roadmachine 02 that came with Shimano 105s (5800 series) all the way around. For Christmas, I got new Shimano Ultegra r8000 front and rear derailleurs, but have heard conflicting views on compatibility with the ST-RS505 shifters.

Does anyone here know if they're compatible?

Thanks in Advance.
I was looking at this the other day. All of your stuff will be fine. The only problem that you would run in to is running a new crankset (9100 ,R8000, RS510) with an older FD (9000, 6800, 5800, etc).

Compatibility chart from Shimano:

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Old 02-11-18, 08:33 PM
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Oh, great. Thanks! I've asked 3 mechanics, 1 said no, not compatible, 1 said he was doubtful, and 1 said it should be no problem. This chart clears it up.

Thanks!
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Old 02-13-18, 02:09 PM
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Not sure if this helps, but I have R8000 shifters with a matching rear mech in non-hydraulic caliper config. Front mech and crank is R5800. Works perfect.
I had the same concerns about mixing two different gens.
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