Description
One Chainring Is Enough. Everything Else Is Cadence. The front derailleur is a compromise that mountain biking has now finished paying for. Twelve speeds at the cassette give you a wider usable range than a triple ever did, with a single shifter, a single cable run, and nothing to drop on a rock strike. The complete SX EAGLE kit takes that argument and turns it into a box of parts you can fit in a morning.
The drivetrain runs the EAGLE 12-speed mechanical system, which in this kit means a right-hand trigger shifter, a long-cage rear derailleur, a 12-speed chain with Power-Lock, an SX EAGLE DUB crankset, and a DUB bottom bracket. The cassette is your choice of the PG-1210 at 11-50T or the NX EAGLE PG-1230 at 11-50T, and the PG-1230 version is built to fit Shimano-style hubs as well, which is the single detail that decides how much of your existing wheelset you keep. Gearing is capped at a 50T climbing sprocket across a 1x12 layout, so the bike will still walk up a wall while keeping a usable cadence on flat fire road.
The bottom bracket list matters as much as the gearing. DUB is supplied for BSA threaded frames, plus BB92, BB30, and PF30 press-fit shells, so the same crankset group suits an older threaded hardtail and a modern carbon frame. Crank length is selectable at 165mm, 170mm, and 175mm, because crank length is a fit question, not a spec-sheet prestige figure. The derailleur is alloy-bodied and the whole set is mechanical, which means no batteries, no firmware, and a shifter that can be serviced trailside with a cable and an Allen key.
Twelve ratios, one lever, and no front derailleur left to apologise for.
Key Features
- ✦ Complete 1x12 EAGLE groupset covering shifter, derailleur, cassette, chain, crank, and bottom bracket
- ✦ 11-50T climbing range on either the PG-1210 or NX EAGLE PG-1230 cassette
- ✦ PG-1230 option is compatible with Shimano-style hubs, preserving an existing wheelset
- ✦ Long-cage mechanical rear derailleur tuned for the EAGLE 12-speed spread
- ✦ DUB crankset offered in 165mm, 170mm, and 175mm lengths
- ✦ DUB bottom bracket supplied for BSA threaded plus BB92, BB30, and PF30 press-fit shells
- ✦ Mechanical actuation with Power-Lock chain for trailside serviceability
Technical Specifications
- Brand: SRAM
- Model: SX EAGLE
- Drivetrain: 1x12 mechanical
- Speeds: 12
- Derailleur type: Long-cage mechanical, alloy
- Cassette: PG-1210 11-50T or NX EAGLE PG-1230 11-50T (selectable)
- Shifter: SX EAGLE right-hand trigger
- Chain: SX EAGLE 12-speed with Power-Lock
- Crankset: SX EAGLE DUB, 165mm / 170mm / 175mm
- Bottom bracket: DUB, BSA / BB92 / BB30 / PF30 (selectable)
- Kit contents: Shifter, rear derailleur, cassette, chain, crankset, bottom bracket
- Actuation: Mechanical cable
Where It Belongs
The Twelve-Speed Trailhead is the natural upgrade for a rider who has outgrown a 2x or 3x drivetrain without wanting to buy a new bike. It suits a hardtail or trail full-suspension frame being rebuilt around a single chainring, an older bike being refreshed with modern climbing range, and a frame-up build where the bottom bracket standard is the first decision rather than the last. It also fits the rider who broke a derailleur hanger on a ride and would rather replace the whole group than chase individual EAGLE parts across three suppliers with mismatched stock.
Frequently Asked Questions
Q: Is this a complete drivetrain or only the derailleur?
A: It is the complete groupset. The kit contains the right-hand trigger shifter, the long-cage rear derailleur, the cassette of your choice, a 12-speed chain with Power-Lock, the SX EAGLE DUB crankset, and the matching DUB bottom bracket.
Q: Will the cassette fit my existing hub?
A: That depends on which cassette you select. The PG-1210 uses the standard SRAM 12-speed driver, while the NX EAGLE PG-1230 is compatible with Shimano-style hubs, which is the option to choose if you intend to keep a Shimano freehub wheelset.
Q: Which bottom bracket standard should I order?
A: Match your frame shell. BSA is a threaded shell found on most steel and alloy frames. BB92, BB30, and PF30 are press-fit standards used on many carbon frames. The correct shell is printed or stamped on the frame itself and is worth confirming before ordering.
Q: What crank length do I need?
A: 165mm suits smaller riders and frames with low bottom brackets where pedal strikes are a problem. 170mm is the most common all-round trail length. 175mm is chosen by taller riders and those who prefer a longer lever on steep climbs.
Q: Does this require any electronic components or batteries?
A: No. The SX EAGLE groupset in this configuration is fully mechanical. Shifting is actuated by cable, the chain uses a Power-Lock link, and every part can be serviced or replaced on the trail with standard hand tools.
Q: What is the ratio spread of the cassette?
A: Both cassette options run 11-50T. That gives twelve evenly spaced ratios with a 50T climbing sprocket, which is the range most riders previously needed a front derailleur to reach.
The EastSupplier Promise
We source directly from the manufacturing floor and ship from our own overseas warehouse stock, so the unit you receive is the unit we inspected. Every listing carries the manufacturer specification sheet, real stock counts, and a support team that answers in plain language.
Shipping: dispatched from overseas warehouse stock with tracked delivery. Warranty: 12 months against manufacturing defect. Support: technical questions answered by the same team that selected the part.
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