US Stock · WHEELTOP EDS GeX 1x12 Wireless Gravel Hydraulic Disc Groupset – 165mm / 40T / 11-45T

EDS GeX Electronic Rear Derailleur

Powered by an 800mAh built-in rechargeable battery, the GeX delivers approximately 20,000 shifts per charge — months of riding between top-ups for most gravel cyclists. The magnetic snap-on charging connector makes top-ups effortless — no exposed port, no cover to lose. The IP67-rated sealed housing keeps mud, water, and grit out at all times. It ships already configured to 12-speed, dialed in for the cassette included in this bundle. Operating temperature -20°C to 60°C.

Internal Chain Damper

A precision-engineered damping system suppresses chain slap and prevents dropped chains on rough gravel, washboard roads, and mixed-terrain surfaces — keeping your drivetrain quiet and controlled when the going gets rough.

93mm Long Cage

This bundle ships with the long-cage version of the GeX rear derailleur, which handles cassettes up to 52T — the right cage for the wide-range cassette included below.

Hydraulic Braking. Electronic Shifting. One Lever.

Shift up or down with a button press — the derailleur responds with zero cable lag. The hydraulic circuit delivers powerful, modulated stopping power running on mineral oil, matched to the RA7800 calipers included in this bundle. The lever body is high-grade cold-laminated carbon fiber — visibly lighter and stiffer than the previous aluminum alloy version, a major upgrade. Lever reach is adjustable up to 8mm. IP65 rated against water jets and dust.

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.

Forged and CNC-Machined Crank Arms

The SL1 crank arms start from a forged 6061-T6 aluminum blank rather than bar stock, then are CNC-machined into a one-piece structure. Forging gives the arm a stronger internal grain structure for high stiffness and crack resistance under hard pedaling — the factory quotes roughly 15% lower weight and 20% higher stiffness on this crankset.

Gap Adjustment Ring

A preload adjustment ring on the non-drive arm takes up the play between the crank and the bottom bracket, then locks in place with a small pinch bolt — so the crankset spins freely without side-to-side movement.

DUB 28.99mm Spindle

The spindle follows the SRAM DUB standard, so it runs in DUB bottom brackets as well as the EVOSID threaded bottom bracket included in this bundle.

ES1001 Narrow-Wide Chainring

Alternating narrow and wide teeth match the chain's inner and outer links, gripping every link so the chain stays put over washboard, roots and rough descents — no front derailleur needed. The ring is fully CNC-machined from 7075-T6 high-strength aluminum with a cut-out spoke design, mounts directly to the SL1 crank arm with 3 bolts (no separate spider) and uses a 3mm offset.

Climbing

Fast

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.

X-Bridge Outer Plates. Open Plate Design.

The SUMC SX12 is a 12-speed chain with double X bridge-shaped outer plates and an open inner and outer plate design for clean shifting. It is compatible with Shimano, SRAM and Campagnolo 12-speed drivetrains. Supplied at 116 links, trim to fit your frame during installation.

Standard

Wider Range

Ceramic Pistons. Unibody CNC Body.

The RA7800 caliper body is machined from a single aluminum block — no seams, no flex under hard braking. Twin 21mm ceramic pistons deliver excellent heat resistance and a consistent bite point across long descents. A unidirectional oil circuit ensures smooth, progressive lever feel from light modulation through to full stop. Compatible with 140mm and 160mm rotors.

Shimano Pad Compatible

Compatible with Shimano L04C, L05A, L04A, BR-RX810, and IIPRO-GLYS brake pads — widely available worldwide and easy to source at any bike shop.

Flat Mount. Pre-Bled. Ready to Ride.

Flat mount only — the standard on modern gravel frames. Hoses are pre-cut and pre-bled from the factory: 900mm for the front, 1,550mm for the rear. Unbox, install, ride. The mineral oil system is non-corrosive and easy to maintain at home.

Step 1

Pair Your Components

Three Components, One Clean View

Rear derailleur, left brake-shifter, and right brake-shifter — all three show live charge level on the same home screen before every ride.

Step 2

Cassette Speed — Pre-Set, Adjustable Anytime

Not Locked to One Speed Count

Unlike a mechanical derailleur built for one fixed speed, EDS GeX is fully configurable — reconfigure it for a different speed count whenever your setup changes.

Step 3

Run Initial Calibration

Guided On-Screen Alignment

No guesswork — use the on-screen +R / −L controls to nudge the guide pulley until it sits precisely under the smallest sprocket, then tap Finish.

Step 4

Fine-Tune Every Gear

Need to Go Further?

Open Rear Derailleur Gear Parameters to view or manually edit the exact position value for any gear, then save — a level of precision cable systems simply can't match.

Set It Once, Ride Your Way

Reassign either lever's buttons to trigger whichever shift function feels natural, or tap Factory restore to reset instantly.

Live Stats While You Ride

Tap GO in the bottom bar to switch into the ride screen, where elapsed time, calories, pace, average heart rate, cumulative shifts, and climb update in real time alongside turn-by-turn map navigation.

Stay Current, Wirelessly

Tap Update now, then watch the transfer progress on screen — just make sure the component has enough charge before you start.

Brand

WHEELTOP (shifting & calipers) · EVOSID (crankset) · SUNSHINE-SZ (cassette) · SUMC (chain)

Model

EDS GeX Disc Brake Wireless Groupset Bundle — 1x12

Suitable For

Gravel bikes, road bikes, drop-bar bicycles — flat mount disc brake frames only, threaded BSA bottom bracket shell 68-73mm wide

Speed

12-Speed (pre-configured before shipping)

Rear Derailleur Cage

93mm long cage (up to 52T cassette)

Chain

SUMC SX12, 12-speed, 116 links, 1/2" × 11/128"

Cassette

SUNSHINE-SZ, 12-speed (Shimano HG driver), 11-45T (11-13-15-17-19-21-23-25-28-32-39-45T, 462g ± 5g) or 11-50T (11-13-15-17-19-21-24-28-32-36-42-50T, 505g ± 5g)

Crankset

EVOSID SL1, forged & CNC-machined crank arm, 165/170mm, DUB 28.99mm spindle, 3-bolt direct-mount chainring — 40/42T, threaded BB included

Brake Type

Hydraulic · Mineral oil · Flat mount · 140mm or 160mm rotor

Caliper Pistons

21mm dual ceramic pistons · CNC unibody aluminum

Pad Compatibility

Shimano L04C / L05A / L04A / BR-RX810 / IIPRO-GLYS

Hose Length

Front 900mm · Rear 1,550mm

Wireless Protocol

Bluetooth + ANT+ — pairs with cycling computers, displays current gear position and battery level

Charging Port

Pogopin magnetic connector

Shifter Battery

CR2032 button cell (tool-free replacement)

Lever Reach

8mm adjustment range · Carbon Fiber Brake Lever (major upgrade from aluminum alloy)

Warranty

WHEELTOP Official 1-Year Quality Warranty (electronic shifting components)

Threaded Bottom Bracket Shell Required

The included crankset uses a BC1.37"×24T threaded (BSA/English) bottom bracket, 68-73mm wide. It is not a press-fit design — confirm your frame has a threaded BSA bottom bracket shell before ordering.

Ships Pre-Set to 12-Speed

The cassette, chain, and crankset in this bundle are all matched for a 12-speed drivetrain, and the derailleur is already configured to 12-speed before it leaves our warehouse — no app setup required for speed count.

Cassette Requires a Shimano HG Freehub Body

The included cassette installs on a standard Shimano HG-splined freehub body. It is not compatible with a SRAM XD or XDR driver. Check your rear hub before ordering.

Flat Mount Frames Only

The RA7800 calipers included in this bundle are flat mount only — not compatible with post-mount frames. Rotor must be 140mm or 160mm. If you ride a rim-brake frame, please see our separate rim brake bundle listing.

1x Drivetrain Only

Designed for single-chainring setups only. Not compatible with double or triple chainring systems.

Already Paired — Just Wake It Up

The derailleur is already paired and powered down for shipping. After installation, simply wake it up and connect to the WHEELTOP app to run gear calibration — no re-pairing needed. The app is free on iOS and Android.

Chain Needs Trimming to Fit

The chain should be sized to your specific chainring/cassette/frame combination during installation using a chain tool.