SRAM AXS Road Groupset Reference: Red · Force · Rival

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What AXS changed and what the E1 update means

AXS is SRAM's umbrella brand for its wireless electronic components — every AXS derailleur pairs to every AXS shifter over encrypted 2.4 GHz, no junction boxes, no internal batteries, no wires. Each derailleur runs on its own rechargeable battery (clip-on for road, integrated for XPLR Transmission). Shifters run on CR2032 coin cells that last ~6 months.

The E1 designation (2024-2025) is the current generation. E1 RED launched May 2024; E1 Force and Rival followed June 2025. The E1 update is significant: Force and Rival adopted RED's hood ergonomics, brake geometry (repositioned pivot for 1-finger braking), and derailleur architecture. The D1/D2 numbers you'll see on discount sites are the previous generation — lighter ergonomics, older brake feel, but functionally still AXS.

/ 02

Groupset total weights (disc brake, 2×12, E1 generation)

/ 03

Cranks & Chainrings

SRAM uses a 1-piece direct-mount crank with a DUB 28.99 mm spindle — incompatible with Shimano's 24 mm Hollowtech II BBs (you need a DUB-specific BB). RED uses hollow carbon arms co-developed with Zipp; Force uses solid carbon; Rival uses aluminum arms with a machined cutout that saves ~50 g over solid alloy. The new XPLR 1× cranks use a Threadmount spider-chainring interface (replaceable rings).

Chainring sizes: RED offers 50/37, 48/35, 46/33 (the 50/37 is the aero option for crit/TT). Force offers 48/35, 46/33. Rival offers 46/33 plus three meter-kit options. 1× road: 40T up to 50T for RED XPLR. The 48/35 chainring is the most common 2× road size across all three tiers.

/ 04

Cassettes

SRAM road cassettes mount on XDR freehubs (not Shimano HG). The 10T smallest cog is what lets SRAM achieve a wider overall range than Shimano's 11T-start cassettes. All four ranges — 10-28T, 10-30T, 10-33T, 10-36T — are available across all three tiers, giving sub-1:1 gearing even at the entry tier. RED's XG-1250 is a single-block machined XDome cassette (lightest); Force uses a 4-cog block + pinned steel; Rival is fully pinned steel (heaviest, longest-lasting).

The XPLR 1×13 cassettes are a different beast: 10-46T single block, 13 speeds, only fits XDR. These require the XPLR Full Mount derailleur (UDH frame). The 13-speed chain is a different Flattop variant — not cross-compatible with 12-speed Flattop.

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Derailleurs

The rear derailleur is where SRAM's tier differences are most visible. RED and Force both use the Orbit fluid damper (chain tension management for rough roads) and a 14T lower jockey wheel. Rival uses a mechanically sprung clutch — functional, slightly less refined. RED adds ceramic bearings to both jockey wheels; Force uses steel. All three are 12-speed Flattop compatible and rebuildable.

Front derailleur: RED officially goes to 56/43T chainrings; Force and Rival top out at 50T. All are wedge-mounted braze-on (with frame-specific clamps for round tubes). The 56T max on RED is what makes the 50/37 and 56/43 chainring options possible — only RED supports those.

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Brakes: the SRAM differentiator

SRAM's 2024-2025 brake update is the biggest functional story across the three tiers. By repositioning the brake lever pivot, SRAM increased leverage enough to claim true 1-finger braking — meaningfully less hand force for the same stopping power than Shimano's servo-wave system. All three tiers got this update. RED adds brake contact-point (bite point) adjustment; Force and Rival have reach adjust only.

Brake fluid is DOT 5.1 (NOT Shimano's mineral oil — never mix). SRAM uses the Stealthamajig hose fitting (simpler than Shimano's banjo). Pads are SRAM A1/A2 sintered or organic — cross-compatible across Red/Force/Rival calipers. Rotors are Center Lock or 6-bolt; SRAM's own Paceline A2 rotors are 160 mm = ~95 g, comparable to Shimano RT-CL900.

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Chains

All SRAM road AXS groupsets use the Flattop chain — the rollers are larger than Shimano's, and the chain is directional (logos face outboard). Flattop chains work across all three tiers and across 2×12 and 1×13 XPLR. The 13-speed XPLR chain is a separate Flattop variant though — don't mix 12 and 13 speed.

RED uses HollowPin construction (hollowed rivets for ~13 g weight savings) with advanced plating. Force has solid pins with plate cutouts. Rival uses solid pins, no cutouts. All include a Flattop PowerLock (reusable quick-link).

/ 08

SRAM vs Shimano: the honest comparison

Weight: at the top tier, Shimano Dura-Ace R9200 (~2,058 g) is ~40 g lighter than SRAM RED AXS E1 (~2,101 g). At the entry tier, the gap flips — SRAM Rival (~2,712 g) is ~150 g lighter than Shimano 105 (~2,562 g... actually heavier). SRAM wins the entry tier, Shimano wins the top tier, by slim margins either way.

Shifting: Shimano's Di2 shifts marginally faster and with a more definitive click. SRAM's AXS shifts are softer, slightly slower, but the wireless setup is dramatically simpler to install and the AXS app gives much more customization (sequential shifting, multi-shift, blip mapping).

Braking: SRAM's 1-finger geometry is a real, felt advantage — less hand fatigue on long descents. Shimano's servo-wave is more initial bite but more hand force. Both excellent; SRAM edges it for feel.

Range: SRAM's 10T-start cassettes give wider range (10-36T = 360% range) vs Shimano's 11T-start (11-34T = 309%). For climbing, SRAM. 1× options exist only on SRAM. Di2 vs AXS battery life is similar (~60 h per charge).

Ecosystem: Shimano's Di2 is closed (Shimano shifters, Shimano derailleurs, Shimano app). SRAM's AXS is more open — works with third-party blips, the AXS Web dashboard, and is more friendly to mixed builds. Shimano is more polished; SRAM is more flexible.