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I want to put the SRAM Rival 1 group on my next bike. Somewhere I heard that the rear derailleur can handle 11-46T cassettes despite the official documentation.

Is that true?

Are there any limitations for the chainring?

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  • If it 'works', 'Works is likely to be Apex or worse shifting at RIval prices.
    – mattnz
    Nov 5 '20 at 22:25
  • Apex and rival shift identically. You aren't paying for better shifting.
    – JoeK
    Nov 6 '20 at 8:32
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Having fitted a few of these, it works on some bikes better than others. I think this is to do with derailleur bolt drop distance. The derailleur can struggle shifting in and out of the 46.

I have had more success using these derailleurs on 11-46t 10sp cassettes with 10sp shifters where the margin for error is better.

The size of the front ring doesn't matter as long as the chain is the right length.

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With a 1x system, any practically sized chainring will work. Do you already own this derailleur?

I expect that you can probably get this to work with a 46T cassette, but my suggestion would be not to buy a new one with that intention.

Hacking bike parts is great fun, my hobby. But when you are buying something new you should buy it for its intended purpose. I expect you will be able to find a similar derailleur that is comparably priced that is rated for the 46T cog.

If you already own it, that is a different story. You might try to find a friend with a 11-46 cassette that you can tryout before buying one. They are pretty common. If you already have both parts, sure give it a try and let us know.

By coincidence, I just answered a similar question here. I describe two success stories with derailleurs working on cassettes that are a little bigger than they are supposed to be.

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  • I haven't bought the parts yet. I'll take a look if I find a derailleur that works with the break-shifting-levers.
    – komape
    Nov 6 '20 at 11:59
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Bikepacking.com has an article about "mullet" drivetrains. One of the drivetrains consists of a Rival 1 rear derailleur with a 9-46T cassette. They write:

The SRAM Rival 1 derailleur works flawlessly, and even though SRAM specifies the max capacity at 42-tooth cassette cogs, it has no issues with a 46.

They even have a drivetrain with a 10-50T cassette but with a replaced derailleur cage.

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