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Old 08-23-15, 08:45 AM   #1
Slaninar
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Can Sora 3500 SS RD handle 11-34 cassette

My crankset is 39-53 double. In the back I have 11-26 cassette. Shimano tech. data says the biggest cassette my RD can handle is 11-32. However, the tooth difference RD can handle is 37 in total capacity, with 25 for the cassette.

That would mean
53-39 = 14
34-11 = 23

Which is 37 in total. This is not beyond stated RD capacity.

Would I be able to squeeze extra 2 teeth at the back, that is use 11-34 instead of an 11-32 cassette?
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Old 08-23-15, 08:58 AM   #2
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When I googled, it pulled up these specs, which suggests that it handles a 14-32 cassette, max.

That said, since you're not exceeding max capacity, might be worth giving it a shot. Understand that once you approach or exceed posted limits like this, your shifting quality might suffer.

If it doesn't work out, worst that would happen is you'd need to swap out to a mtn RD.
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Old 08-23-15, 09:36 AM   #3
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Often, you can go a couple teeth bigger, but no guarantee.
Geometry of the RDER hangar/axle can have an effect, so one bike may and another may not.
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Old 08-23-15, 10:47 AM   #4
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You might need a longer B-screw, M4 X 25mm is typically OK, or turn your current one backwards and have the derailleur bear upon the head
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Old 08-24-15, 08:45 AM   #5
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Works fine. B screw screwed in as far as it would go.

11-34

11-32 would probably have been a bit safer option. Will consider it next time perhaps. Or rather 12-32 if I find a Shimano one.
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Old 08-24-15, 11:29 AM   #6
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Simple solution? Install a Deore rear derailleur - it will work with an 11-34 cassette and a road groupset.
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Old 08-24-15, 11:51 AM   #7
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Simple solution? Install a Deore rear derailleur - it will work with an 11-34 cassette and a road groupset.
M592 is a good choice.
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Old 08-24-15, 11:45 PM   #8
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If it didn't work, I would have. But it works.

Sora 3500 with an 11-34 cassette.
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