SRAM has collapsed nine overlapping Eagle mountain-bike drivetrains into three clearly-priced tiers — S100, S200 and S500 AXS — and the biggest wins land at the budget end.
From nine groupsets to three
For the better part of a decade, choosing a SRAM Eagle mountain-bike drivetrain meant decoding a wall of names — SX, NX, GX, X01 and XX1 on the mechanical side, then GX AXS, X01 AXS, XX1 AXS and X1 AXS once you wanted wireless. The new Eagle S-Series folds all nine of those into three: S100 (entry-level mechanical), S200 (performance mechanical) and S500 AXS (the electronic flagship).
The logic is a clean performance ladder. The S100 inherits the NX/SX slot, the S200 absorbs everything from GX up to XX1 mechanical, and the S500 AXS replaces the entire wireless line. As BikePacking reports, SRAM's stated goal is simply to simplify its component lines and make the buying decision easier for riders.
The three tiers at a glance
| Eagle S100 | Eagle S200 | Eagle S500 AXS | |
|---|---|---|---|
| Shifting | Mechanical (cable) | Mechanical (cable) | Electronic / AXS wireless |
| Replaces | NX, SX Eagle | XX1, X01, GX Eagle | XX1/X01/GX/X1 Eagle AXS |
| Gear range | 455% (11-50T) | up to 520% (10-52T) | up to 520% (10-52T) |
| Cassette | PG-1210 | XG-1275 | XG-1299 |
| Crank material | Aluminium | Aluminium | Carbon |
| Crank lengths | 155–175mm | 155–175mm | 165–175mm |
| Half Mount option | Yes (+$10 (~R170)) | No | No |
| Derailleur (USD) | $70 (~R1 200) | $135 (~R2 200) | $390 (~R6 400) |
| Cassette (USD) | $85 (~R1 400) | $220 (~R3 600) | $545 (~R9 000) |
By the numbers
Source: BikePacking / BikeRadar
Pricing: the real story is at the bottom
View data table
| S100 | S200 | S500 AXS | |
|---|---|---|---|
| Derailleur | 70 $ | 135 $ | 390 $ |
| Cassette | 85 $ | 220 $ | 545 $ |
| Crankset | 70 $ | 100 $ | 365 $ |
| Shifter | 30 $ | 40 $ | 160 $ |
| Chain | 30 $ | 40 $ | 100 $ |
In Rand (approx, @ today's rate): Derailleur: ~R1 200 · Cassette: ~R1 400 · Crankset: ~R1 200 · Shifter: ~R500 · Chain: ~R500
Look past the flagship and the story gets interesting. The S200 mechanical derailleur lands at $135 (~R2 200) — the same money SRAM charged for a GX derailleur — while a mid-tier S200 crankset is $100 (~R1 700) against $160 (~R2 600)-plus for the old GX Eagle crank. A complete S100 group, cassette and crank included, comes in around $295 (~R4 900). In euros, velomotion lists complete groups at roughly €315 (~R5 900) (S100), €585 (~R11 000) (S200) and €1,530 (~R28 700) (S500 AXS).
The S500 AXS is where the money still lives: a $390 (~R6 400) derailleur, a $545 (~R9 000) XG-1299 cassette and a $365 (~R6 000) carbon crank (all approx, USD). There is no South African RRP confirmed yet — watch the live local prices below as stock lands.
What the reviews say
Three outlets weigh in
Independent verdicts from across the cycling press — follow each link for the full review.
Smart, familiar protection
“It reminds me strongly of Specialized's HGR derailleur hanger guard from over a decade ago, in the way it bolts onto the concentric axle-mount and into the end of the derailleur to reinforce the body against knocks.”
Read the full reviewThe mid-tier has the most to prove
“The S200 arguably has the biggest shoes to fill.”
Read the full reviewSRAM is staying quiet on weights
“It's unknown how the weight of the S200 derailleur will compare to these two legacy options.”
Read the full reviewOur read on the consolidation
- Far simpler buying decision — three clear tiers instead of nine overlapping names
- Real value gains below the flagship: S200 derailleur at old GX money, complete S100 group around $295 (~R4 900)
- New 155mm crank length now reaches down to the budget and mid tiers
- Backwards-compatible with existing UDH frames and 10-50T/11-50T Eagle cassettes
- Optional $10 (~R170) Half Mount adds cheap durability at the entry level
- SRAM has not published S-Series weights — Singletracks couldn't get them
- S500 AXS is still a premium spend (the cassette alone is $545 (~R9 000))
- Half Mount protects only the S100, not the S200 or S500
- Yet another renaming, arriving alongside the separate T-Type Transmission line
- Not the hangerless Transmission some buyers may now expect from “new SRAM”
Tap to vote — see how readers lean
Eagle S-Series: your questions answered
Is the Eagle S-Series the same as SRAM Transmission (T-Type)? +
No. The S-Series is the classic hanger-mounted Eagle line — X-Actuation cable shifting on S100/S200, or AXS wireless on the S500 — running on a standard UDH and derailleur hanger. Transmission is the separate hangerless, full-mount T-Type system.
Will the S-Series work with my existing Eagle cassette? +
Yes. The S100 derailleur is backward-compatible with 11-50T and 10-50T Eagle cassettes, and the S200/S500 run 10-50T or 10-52T, so most current Eagle setups carry over.
What is the UDH Half Mount and do I need it? +
It's an optional ~$10 (~R170) reinforcing plate that bolts the S100 derailleur to the UDH axle to shrug off side knocks and slams. It only fits the S100 — the S200 and S500 don't take it.
How much does the S-Series cost? +
US MSRP: S100 derailleur $70 (~R1 200), S200 $135 (~R2 200), S500 AXS $390 (~R6 400); a complete S100 group is about $295 (~R4 900). European complete-group pricing runs roughly €315 (~R5 900) (S100), €585 (~R11 000) (S200) and €1,530 (~R28 700) (S500 AXS). No South African RRP has been confirmed yet.
Is the S-Series lighter than GX or XX1? +
Unconfirmed. SRAM hasn't published S-Series weights; Singletracks says it asked and received no reply by press time, so any weight comparison is currently guesswork.
Sources & further reading
- The New SRAM Eagle S-Series Consolidates an Expansive Groupset Lineup — BikePacking
- SRAM Simplifies the Eagle Lineup to Three-Tiered S100, S200, and S500 — The Radavist
- SRAM kills off nine drivetrains with new S-Series components — BikeRadar
- New SRAM S-Series debuts UDH Half Mount, drops lightest-weight mechanical derailleur — Singletracks
- The end for GX, X01 and XX1: SRAM Eagle S-Series Groupsets — velomotion
- Eagle Drivetrain — official S-Series overview — SRAM
The Eagle S-Series is less a technical revolution than a long-overdue tidy-up — and a welcome one. Three named tiers are far easier to shop than nine, the mid-range and budget pricing genuinely improves, and the optional Half Mount is a clever, cheap durability win for entry-level bikes. The catch: SRAM still won't publish weights, the S500 AXS remains a premium spend, and the renaming arrives on top of the separate T-Type Transmission line, so expect some showroom confusion before it settles. For most South African riders the practical takeaway is simpler shopping and better value below the flagship — keep an eye on the live prices as S-Series stock reaches local shelves.
