Carbon Fiber Hollow Oversized Pulley Cage

Driven by a built-in 800mAh rechargeable battery at 8.4V, the EDS TX rear derailleur shifts instantly on a button press — zero cable lag, zero stretch over time. It ships already configured to 12-speed, dialed in for the SUNSHINE-SZ cassette included in this bundle. The 12-tooth oversized pulley wheels are carbon fiber hollow construction, fitted from the factory — not an optional add-on. Charges through a magnetic Pogopin connector — snap it on, no port covers, no corrosion.

Pre-Matched to This Bundle's 12-Speed Cassette

Ships already configured to 12-speed for this bundle — just pair the derailleur to the WHEELTOP app for calibration and you're ready to ride. The derailleur itself supports up to 14-speed, so if you swap in a different cassette down the line, the speed count is a quick change in the app rather than a hardware limitation.

Why Oversized? The Chain Wrap Angle Difference.

At 12 teeth, the oversized pulleys are physically larger than a conventional jockey wheel — letting the chain bend through a gentler arc at each engagement. Less arc per revolution means less per-link articulation friction across every pedal stroke, and the hollow carbon fiber construction keeps the added size from adding meaningful weight.

Shift with a Button. Brake with the Lever.

A press of the shift button sends the command wirelessly straight to the derailleur — no cable pull, no mechanical play to wear in. Each lever runs on a single CR2032 button battery, swappable in seconds without tools. The carbon fiber lever body is high-grade cold-laminated carbon fiber, actuating the hydraulic disc calipers included in this bundle.

Carbon Fiber Body — Light, Stiff, Precise.

The carbon fiber lever body is high-grade cold-laminated carbon fiber. The woven surface texture holds grip through wet descents without repositioning. The shift button sits exactly at thumb reach: index finger pulls the brake lever, thumb taps the shift button — no hand movement required.

One Lever, Two Functions.

Brake and shift from the same contact point. The lever body handles the brake pull, the button handles the gear command — both without taking your fingers off the bar.

CNC Unibody. Built to Run Cool.

The caliper body is CNC-machined from aluminum alloy as a single unit, ensuring rigidity and long-term safety under hard braking. Shark-fin heat sinks on the caliper body increase surface area for better heat dissipation, slowing down thermal fade on long descents. A unidirectional oil circuit prevents brake fluid from flowing backward, keeping lever feel sharp and response quick.

Full Ceramic Pistons

Full ceramic pistons resist high heat and hold a consistent bite point ride after ride — no fade, no spongy lever after a long climb or fast descent.

Flat or Post Mount. Pre-Bled. Ready to Ride.

Hoses are pre-cut and pre-bled from the factory. Unbox, install, ride. The mineral oil system is non-corrosive and easy to maintain at home. Confirm your frame and fork's caliper mount type (flat or post) and rotor size before ordering.

Forged Arm, 3-Bolt Direct-Mount Ring

The EVOSID SL1 crank arms are forged aluminum alloy, CNC-machined into a one-piece structure for high stiffness and crack resistance under hard pedaling. The chainring is a separate 7075 aerospace-grade aluminum alloy piece, using a 3-bolt direct-mount interface (T25 Torx bolts). Runs on a SRAM DUB-standard 28.99mm spindle. Available in black or silver.

Spider-Web Pattern, Milled for a Reason

The chainring face is CNC-milled into a radiating spider-web pattern rather than left as a flat disc — removing material where it isn't structurally needed cuts weight while the ribbed pattern reinforces the areas that carry pedaling load. It's a look you'd normally only find on higher-end race cranksets.

46T / 48T / 50T

Three chainring sizes to choose from — a smaller ring for more manageable gearing, a larger ring for a taller top-end on flatter routes. The closed-disc profile also keeps loose clothing and cables away from the chainring.

Fewer Bolts, Faster Swaps

Just 3 T25 Torx bolts hold the chainring to the spider — the factory quotes roughly 40% faster installation than a traditional multi-bolt design, so swapping between the 46/48/50T options takes minutes, not a full workshop session.

Threaded Bottom Bracket, Cups Included

The crankset ships with its matching EVOSID BC1.37"×24T (BSA/English threaded) bottom bracket. Overall width is 90mm and it accepts bottom bracket shells from 68mm up to 73mm wide, with included spacers (two 2.6mm gaskets, a 3mm spacer, and a 4.5mm spacer) to take up the difference. Threading directly into a standard threaded shell also avoids the creaking that press-fit bottom brackets are known for.

Is Your Frame Compatible?

As long as your frame's bottom bracket shell is BSA (English thread) between 68mm and 73mm wide, this bottom bracket installs without any issue. It is not a press-fit design.

SUMC SX12 — 126-Link 12-Speed Chain

A dedicated 12-speed chain built with SUMC's double-X outer plate profile for smoother shifts under load and a slight friction reduction over a generic chain. Supplied at 126 links (standard length, trim to fit your frame during installation) and finished in silver to match the rest of the drivetrain hardware.

Per-Gear Fine Adjustment

Dial in every sprocket individually. If one gear feels off, adjust it directly in the app without touching the bike — a precision that cable systems simply can't match.