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Check the sprocket capacity of both of those. Cage length doesn't change how big of a cog it can fit under (on its own)
Aren't capacity and cage length the same thing? Since cage length determines capacity.
Anyhow, @Netakure most short or medium cages have enough capacity (usually around 35tooth) for a big cassette like an 11-42, since the capacity is the difference between your smallest and biggest gear in a 1x setup. 42-11=31 So you'll need a derailleur with a 31+ capacity for an 11-42 cassette.
The next thing you have to look out for is the max sprocket size clearance, on most short and medium derailleurs that will be somewhere between 28 and 36. But like @PhilDAS and @maynardeames show, you can increase the clearance with an extender.
Hope it helps.
Jaap-
I didn’t mean capacity as in amount of slack it can take up. I meant the biggest cog it can fit under. They’re in the specifications.
Yes cage length determines how many teeth worth of chain it can take up, “capacity”I couldn’t think of a better word for what I meant
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I kind of understand it. But in the end cannot do what I want, having a wheelset with 30t and another with 40t and swapping without much fiddle.
I'll keep my long cage and maybe I'll change to middle for cross season
PhilDAS
Netakure
Check the sprocket capacity of both of those. Cage length doesn't change how big of a cog it can fit under (on its own)