{"product_id":"sram-xs-1270-eagle-transmission-cassette-12-speed-10-52t-hg","title":"SRAM XS-1270 Eagle Transmission Cassette — 12-Speed, 10-52T, HG","description":"\u003cp\u003e\u003cstrong\u003e10-52 teeth. 520% of range. On a standard HG freehub.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThat last part is the news. Every other Eagle Transmission cassette requires an XD driver body. This one doesn't — SRAM integrated the 10-tooth cog into the lockring, which means a full 10-52 range fits on the same splined freehub that's been on mountain bikes for two decades.\u003c\/p\u003e\n\n\u003cp\u003eCog sizes: \u003cstrong\u003e10, 12, 14, 16, 18, 21, 24, 28, 32, 38, 44, 52.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eWhy the HG driver matters\u003c\/h4\u003e\n\n\u003cp\u003eIf you've priced a Transmission upgrade before, you've run into this: the cassette needs an XD driver body, and if your wheels don't have one, you're buying a driver body — or a whole rear wheel — on top of the drivetrain.\u003c\/p\u003e\n\n\u003cp\u003eThe XS-1270 removes that line item. It mounts to a standard splined 8, 9, or 10-speed HG driver. On an 11-speed HG driver, it needs a 1.85mm spacer and nothing else.\u003c\/p\u003e\n\n\u003cp\u003eIt's also approved for \u003cstrong\u003ealuminum\u003c\/strong\u003e driver bodies, not just steel, and rated for both MTB and E-MTB use. That's not a given on a cassette with a 10-tooth cog — the small cogs concentrate a lot of torque into a few splines, and plenty of cassettes are steel-driver-only for that reason.\u003c\/p\u003e\n\n\u003cp\u003ePractical result: on a lot of bikes this is a drivetrain upgrade that doesn't turn into a wheel upgrade.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eYou need a full Transmission setup\u003c\/h4\u003e\n\n\u003cp\u003eThis cassette is one part of an integrated system, and it will not work outside it.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEagle Transmission (T-Type) rear derailleur.\u003c\/strong\u003e Transmission derailleurs and cassettes are designed to physically reference each other. A standard Eagle or Eagle AXS derailleur will not shift this correctly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA UDH frame.\u003c\/strong\u003e Transmission derailleurs mount directly through a UDH-standard dropout with no hanger. If your frame uses any other hanger pattern, Transmission won't fit it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA 55mm chainline crank.\u003c\/strong\u003e This cassette's gear positions are built around a 55mm chainline, which means a T-Type or MTB Wide crankset.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA T-Type chain.\u003c\/strong\u003e Not Eagle 12-speed, not Flattop, not Shimano. T-Type.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e1x only.\u003c\/strong\u003e There's no front derailleur configuration for Transmission.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eWhat Transmission actually does differently\u003c\/h4\u003e\n\n\u003cp\u003eThe reason to run this system isn't the range — plenty of drivetrains have wide range. It's what happens when you shift under load.\u003c\/p\u003e\n\n\u003cp\u003eBecause the derailleur bolts directly to the frame instead of hanging off a bendable hanger, and because the cassette's tooth profiles are cut to hand the chain off at specific points in the rotation, Transmission will complete a shift with full power going through the pedals. Standing, mid-climb, out of a corner. The system is designed for the shift you'd normally back off for.\u003c\/p\u003e\n\n\u003cp\u003eSetup is the other half. There are no limit screws and no B-gap adjustment. A clearly marked \u003cstrong\u003eSetup Cog\u003c\/strong\u003e on the cassette gives the derailleur its reference point, you follow the printed procedure once, and it's done. No hanger alignment, ever, because there's no hanger.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eReplaceable cluster\u003c\/h4\u003e\n\n\u003cp\u003eGears 8 through 12 — the 28, 32, 38, 44, and 52 — come off as a replaceable cluster rather than being pinned permanently into the stack.\u003c\/p\u003e\n\n\u003cp\u003eOn a 1x mountain drivetrain those are the cogs doing the heavy work, and they're the ones that wear out first. Being able to replace that section instead of the entire cassette is a meaningful reduction in what this drivetrain costs to keep running over a few seasons.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eGear steps\u003c\/h4\u003e\n\n\u003cp\u003eThe steps are wider than a road cassette, and deliberately so. Mountain riding doesn't ask you to fine-tune cadence — it asks for a gear that works for the next fifty feet of trail, right now.\u003c\/p\u003e\n\n\u003cp\u003eTwo-tooth steps through the fast end keep the top of the range usable on fire roads and flat transfers. The bottom opens up into the 38, 44, and 52 that turn a steep, loose, technical climb from a hike-a-bike into a ride.\u003c\/p\u003e\n\n\u003cp\u003e520% of range from a single ring. On a 32T chainring, that's roughly 3.2:1 at the top down to 0.62:1 at the bottom.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eBuilt to last\u003c\/h4\u003e\n\n\u003cp\u003eBlack nickel chrome plating adds surface hardness and runs quieter under the chain. Full X-SYNC tooth design across the whole cassette handles both inboard and outboard shifts under load — the shifting profiles are cut into every cog, not just the ramps between a few of them.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eWhat you'll still need\u003c\/h4\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAn Eagle Transmission (T-Type) rear derailleur\u003c\/strong\u003e and a UDH frame to mount it to\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA 55mm chainline crankset\u003c\/strong\u003e — T-Type or MTB Wide\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eA T-Type chain\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eA 1.85mm spacer\u003c\/strong\u003e if you're mounting to an 11-speed HG driver\u003c\/li\u003e\n\u003cli\u003eA cassette lockring tool\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eFitment\u003c\/h4\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDriver body:\u003c\/strong\u003e Splined HG 8, 9, or 10-speed. Fits an 11-speed HG driver with a 1.85mm spacer. Not XD or XDR.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDriver material:\u003c\/strong\u003e Approved for both steel and aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeeds:\u003c\/strong\u003e 12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrivetrain:\u003c\/strong\u003e 1x only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChainline:\u003c\/strong\u003e 55mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRear derailleur:\u003c\/strong\u003e Eagle Transmission (T-Type) only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain:\u003c\/strong\u003e T-Type only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplications:\u003c\/strong\u003e MTB and E-MTB approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e CS-XS-1270-A1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e 00.2418.141.002\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGearing:\u003c\/strong\u003e 10-52T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCog sizes:\u003c\/strong\u003e 10, 12, 14, 16, 18, 21, 24, 28, 32, 38, 44, 52\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeeds:\u003c\/strong\u003e 12\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTotal range:\u003c\/strong\u003e 520%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 565g\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black nickel chrome\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDriver body interface:\u003c\/strong\u003e Splined 8, 9, 10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrivetrain configuration:\u003c\/strong\u003e 1x\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChain technology:\u003c\/strong\u003e T-Type\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaceable cluster:\u003c\/strong\u003e Gears 8-12\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eInstallation\u003c\/h4\u003e\n\n\u003cp\u003eFind the marked Setup Cog before you start — that's the reference the derailleur sets itself against, and the Transmission setup procedure depends on it. Follow SRAM's printed sequence rather than improvising; there are no limit screws to fall back on if you skip a step.\u003c\/p\u003e\n\n\u003cp\u003eTorque the lockring to spec with a torque wrench. A little anti-seize on the driver splines makes removal much easier a year from now.\u003c\/p\u003e\n\n\u003cp\u003eReplace the chain at the same time if the old one is worn. A worn chain on a new cassette will chew the new cogs quickly, and you'll be buying both again.\u003c\/p\u003e\n\n\u003cp\u003eFull documentation is available in \u003ca href=\"https:\/\/www.sram.com\/en\/service\/models\/cs-xs-1270-a1\" target=\"_blank\" rel=\"noopener\"\u003eSRAM's service hub for this model\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch4\u003eOE product information\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot intended for retail sale.\u003c\/strong\u003e This is original-equipment product supplied for dealer service, warranty replacement, and complete-bike build applications.\u003c\/p\u003e\n\n\u003cp\u003eOE product is the same component that ships on complete bikes — identical specification, identical performance. What differs is how it's supplied:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003ePlain bulk or poly packaging rather than a retail box\u003c\/li\u003e\n\u003cli\u003eNo printed manuals or quick-start guides — all documentation is available free from SRAM's service hub, linked above\u003c\/li\u003e\n\u003cli\u003eNo retail hang tags or display materials\u003c\/li\u003e\n\u003cli\u003eSmall-parts and hardware content may differ from the retail pack\u003c\/li\u003e\n\u003cli\u003eComponents may show minor handling marks from bulk packing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eWarranty.\u003c\/strong\u003e SRAM's consumer warranty program does not apply to original-equipment components. Warranty and defect claims on this item are administered by State Bicycle Co. Contact our support team with your order number. Wear is not a defect — cassettes are a consumable.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003csmall\u003e\u003cem\u003eOriginal equipment service item. Supplied in OE packaging for dealer service, warranty replacement, and complete-bike build applications; not a retail-packaged consumer product and not intended for retail sale. SRAM consumer warranty does not apply to original-equipment components — warranty administration on this item is provided by State Bicycle Co. Requires an Eagle Transmission (T-Type) rear derailleur, a UDH-compatible frame, a 55mm chainline crankset, and a T-Type chain. Not compatible with standard Eagle drivetrains, XD, or XDR driver bodies. SRAM, Eagle, Transmission, T-Type, AXS, XS, X-SYNC, and UDH are trademarks of SRAM LLC. State Bicycle Co. is not affiliated with or endorsed by SRAM LLC. Specifications subject to change without notice.\u003c\/em\u003e\u003c\/small\u003e\u003c\/p\u003e","brand":"SRAM","offers":[{"title":"Default Title","offer_id":44166154322007,"sku":"751503808074","price":181.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0232\/3305\/files\/SRAMXS-1270EagleTransmissionCassette_12-Speed_10-52T_HG.png?v=1786729500","url":"https:\/\/www.statebicycle.com\/en-gb\/products\/sram-xs-1270-eagle-transmission-cassette-12-speed-10-52t-hg","provider":"State Bicycle Co.","version":"1.0","type":"link"}