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I'm having trouble understanding SRAM road component compatibility "map" as they call it, specifically the cassette and rear derailleur part.

For example, the PG-1130 cassette has no black box marker for the 11-28 size. What exactly does that mean? How can specific casette sizes be incompatible with ANY derailleur size (neither medium nor short)?

In my specific case, I'm upgrading to eTap and since I have a spare new PG-1130 11-28 cassette with PC-1130 chain, I was going to use that, but now after checking the chart it does not make any sense to me. Anyone could explain this?

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My interpretation: dots indicate availability. Bars under the cassette sizes indicate compatibility with medium and short cage derailleurs.

I assume in previous years SRAM made a 11-28 PG 1130 cassette.

enter image description here

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  • I assume in previous years SRAM made a 11-28 PG 1130 cassette. Well, mine was manufactured 2018W29 and the "compatibilty map" is the latest one, dated 2018, so who knows.
    – Misterer
    Commented Mar 5, 2019 at 17:58
  • @Misterer I think this is what happens when you ask graphic designers to produce something technical.
    – Rider_X
    Commented Mar 5, 2019 at 21:47

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