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Latest Shimano Sora group - rear derailleur capacity question.

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Latest Shimano Sora group - rear derailleur capacity question.

Old 11-07-18, 05:18 PM
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Plainsman
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Latest Shimano Sora group - rear derailleur capacity question.

With a 50/34 crankset, does anyone know if the new 3000 series Sora 9 speed short cage rear derailleur can handle an 11-30 or 12-32 cassette?
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Old 11-07-18, 05:42 PM
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Learned any thing from reading prior posts asking the same Question?
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Old 11-07-18, 06:18 PM
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https://bike.shimano.com/en-US/produ...-R3000-SS.html

Just go and look it up on the Shimano website, the one reason that I like working on Shimano stuff in the shop is that they always have the make and model number somewhere on their components.

Per Shimano; the max number of teeth for the low gear on their short cage R3000 Sora RD is 32T.
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Old 11-07-18, 06:33 PM
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Originally Posted by fietsbob View Post
Learned any thing from reading prior posts asking the same Question?
Prior posts may not be all that helpful. The most recent versions of Sora rear derailleurs probably can handle much larger rear cogs than older versions.
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Old 11-07-18, 07:55 PM
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No, prior posts I found in my search did not answer my specific question, or at least not specifically enough that I found them. *Scuba, thanks for the link, that was helpful to me. I didn't remember how to calculate total capacity, so the numbers weren't at first clear - that's why I was asking with that specific chainring combo - I knew they were somehow related but could recall exaclty how. Performance Bike answered the question for me. So if anyone else does a search and wants to know - here it is - total capacity = (largest cog - smallest cog) + (biggest chainring - smallest chainring). For my question about the R3000 short cage rear derailleur, an 11-32 cassette would even work because, (32-11) + (50-34) = 21 + 16 = 37 teeth. And the Shimano page *Scuba links to says the max capacity of the Sora R3000 SS is 37 teeth (37T)
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