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  "description": "Goodbye to all the X's.",
  "path": "/sram-eagle-s-series-consolidates-nine-groupsets-into-three/",
  "publishedAt": "2026-04-20T02:58:12.000Z",
  "site": "https://escapecollective.com",
  "tags": [
    "Transmission",
    "SRAM XX SL Eagle review: A new frontier for the rear derailleurThree wholly new high-end groupsets aim to make pesky derailleur hangers redundant.Escape CollectiveDave Rome",
    "T70 and T90 mechanical",
    "In for review: SRAM Eagle 90 Mechanical TransmissionA detailed look at SRAM’s new mechanical shifting, along with some early impressions.Escape CollectiveDave Rome",
    "Subscribe now"
  ],
  "textContent": "Quietly slipping into retailers around the globe, SRAM has made some rather massive changes to its Eagle mountain bike drivetrain ranges. Gone are Eagle SX, NX, GX, X01, and XX1, mechanical and AXS. Now, they’re all replaced by three simple tiers of S-Series groupsets: S100 (mechanical), S200 (mechanical), and S500 (AXS electronic).\n\nThis new range is all about streamlining SRAM's offerings and greatly whittling down the SKU (stock keeping unit) count. In the process, SRAM has cherry-picked features and materials from its existing line-up while creating a few new parts.\n\nBefore I go any further, a quick recap of previous episodes. Eagle drivetrains are the older generation of SRAM’s 1x12 mountain bike components, the generation before Transmission, where the derailleur is still mounted to a regular hanger (no UDH frame required), and before the chain got a Flat Top. This generation remains everywhere at trail heads, in bike stores, and even on new bikes. These new S100/200/300 groups retain backward compatibility to previous Eagle Drivetrain offerings.\n\nNine becomes three. SRAM XX SL Eagle review: A new frontier for the rear derailleurThree wholly new high-end groupsets aim to make pesky derailleur hangers redundant.Escape CollectiveDave Rome\n\n## S100\n\nSRAM Eagle S100.\n\nThe new entry-level option in SRAM’s mountain bike line-up is S100. This OE-focused (original equipment) group replaces SX and NX mechanical components, but thankfully, it is said to be more robust in build quality. That’s great news, as Eagle SX was awful.\n\nWhile all other Eagle Drivetrain and Transmission components offer a wider 10-52T range, S100 is the outlier with SRAM officially stating compatibility is limited to the 11-50T cassette (PG-1210). This all-steel cassette keeps e-bikers in mind with the 11, 13, and 15T cogs being separately replaceable. This simpler US$85 cassette mounts to a Shimano-type HG freehub body.\n\nAs with all derailleurs in this new series, it still mounts to a regular derailleur hanger. And as with older Eagle components, the backward compatibility is strong, allowing you to mix and match shifters, chains, and cranks with anything in the old or new line-up. Just watch for that official 11-50T cassette requirement.\n\nThe S100 derailleur also introduces a new feature that SRAM is calling the UDH Half Mount. When used with a UDH frame and UDH hanger, this optional US$10 piece provides the derailleur with a secondary support for additional impact protection. Some aftermarket companies have taken a similar approach, with the Madrone Jab being one example. This UDH Half Mount is not offered with any other SRAM derailleur models.\n\nIntroducing the SRAM UDH Half Mount (S100 only). It's effectively a reinforcing plate that we've seen from a few smaller brands.\n\nAs was seen in the release of T70 and T90 mechanical, the new S100 (and S200) shifters get a lighter shift action through longer levers. The shifters also feature the new ‘Stealth Routing’ that aims to keep the cable closer to the bar. Unfortunately, it appears these new shifters are only available in a single-click variant with no multishift option mentioned. The S100 version offers an integrated clamp.\n\nIn for review: SRAM Eagle 90 Mechanical TransmissionA detailed look at SRAM’s new mechanical shifting, along with some early impressions.Escape CollectiveDave Rome\n\nThe other notable update is an increased array of crank lengths. Even in this budget group, SRAM is now offering lengths from 155 to 175 mm. These alloy cranks also feature a three-bolt chainring interface for easy ring compatibility. However, in the name of cost-cutting, the S100-level cranks feature an older Powerspline splined bottom bracket.\n\n## S200\n\nSRAM Eagle S200.\n\nNeed replacement parts for your older mechanical Eagle GX, X01, XX1? Or perhaps you just want SRAM’s best mechanical mountain bike shifting that doesn’t require a UDH frame like T70 and T90? The new S200 is likely where you’ll be looking.\n\nCompared to S100, the S200 range offers a larger gear range (520% versus 455%), is lighter, features a more advanced derailleur clutch, and is built with aftermarket demand in mind.\n\n### This post is for subscribers only\n\nBecome a member to get access to all content\n\nSubscribe now",
  "title": "SRAM's new Eagle S-Series consolidates nine groupsets into three",
  "updatedAt": "2026-04-20T11:29:32.749Z"
}