Sensah SRX Pro 1x11 Speed Gravel Groupset

Everything you need for a 1x11 drop bar gravel build. One purchase, ready to install.

Sensah was founded by engineers who previously worked at SRAM's manufacturing facility in the Guangzhou area — a background that gives the SRX Pro its precise shifting feel and thoughtful lever design. The SRX Pro is Sensah's dedicated gravel and cyclocross groupset — a 1x11 speed mechanical drivetrain built specifically for drop bar mixed-terrain riding. This complete build kit includes everything needed for a full drivetrain installation: shifters, rear derailleur, crankset, bottom bracket, cassette, and chain. Brakes and cables sold separately.

Sensah SRX Pro Shifters — Right Shifts, Left Brakes
The right lever shifts and controls the rear brake. The left lever is a brake-only lever — clean, simple, and correct for a 1x build with no front derailleur to manage. Three-in-One lever technology means the full lever moves as a single unit for all shifting inputs — an intuitive, unambiguous action that is quick to learn and consistent to execute under load and in variable conditions. The shifting action is light and precise, with the ability to move up to 3 gears at a time with a full sweep of the lever. Adjustable reach on both levers accommodates a full range of hand sizes. A lever lock mechanism prevents accidental shifting during braking.

Sensah SRX Pro Rear Derailleur — Up to 52T Maximum Cog
The SRX Pro rear derailleur handles cassettes up to 52T maximum cog — well beyond the 42T cassette in this kit, leaving meaningful room for future cassette upgrades as your riding evolves. Precise indexing and a wide cage design cover the full range of wide-ratio 1x gravel and adventure gearing configurations. Note that the tension mechanism is an adjustable spring rather than a true friction clutch — for aggressive off-road use where chain retention under severe vibration is critical, a chain guide is recommended.

Senicx PR3 Crankset — 40T, 170mm
The Senicx PR3 is a well-regarded gravel crankset that brings genuine performance engineering to an accessible price point. Forged AL-6061-T6 crank arms and an AL-7075-T6 direct mount chainring — the same aluminium alloys used in significantly more expensive cranksets from major brands. 40T chainring, 170mm crank arm length, 24mm spindle interface, direct mount chainring attachment. Compatible with 10, 11, and 12-speed drivetrains. Q-factor 151mm, chainline 49.7mm. Independent testing has placed it within 10 grams of a Shimano 105 crankset in weight, with comparable finish quality and a smooth installation process. A crankset that performs above its price point without apology.

Shimano BB-RS501 Bottom Bracket
The BB-RS501 is Shimano's standard threaded bottom bracket for external bearing cranksets with a 24mm spindle — exactly what the Senicx PR3 uses. BSA 68mm English thread shell compatibility, correct for the Evercoast Passage and Passage Pro frames and the vast majority of standard road and gravel frames. Specified and included so the build goes together without a compatibility question at the workshop.

Sunshine 11-42T 11-Speed Cassette — HG Compatible
Sunshine is a proven cassette manufacturer used as OEM by multiple global bicycle brands — a company producing cassettes comparable in quality to major brands, available at an accessible price. The 11-speed 11-42T cassette uses high wear-resistant steel with nickel-plated chrome treatment, hollow design construction for weight reduction, and high precision tooth geometry for consistent, reliable shifting. Compatible with standard Shimano HG freehub bodies — the same freehub on the Novatech 791SB and 792SB hubs used on the Passage and Passage Pro. Cog sequence: 11-13-15-17-19-21-24-28-32-36-42T. The 42T large cog provides a genuine bail-out gear for steep climbs under load without sacrificing high-end speed on flat terrain.

KMC X11 Chain — 11-Speed
The KMC X11 is included as the correct chain for this drivetrain. Double X-Bridge construction for precise shifting, nickel plated finish, non-directional installation, and MissingLink included for tool-free removal and installation. 

What's Included

Not included: Brakes, cables, housing, bar tape, rotors.

Compatibility Notes

HG freehub required — the Sunshine cassette requires a standard Shimano HG freehub body. Compatible with the Novatech 791SB and 792SB hubs used on Passage and Passage Pro builds and all standard HG freehub wheels.

Bottom bracket included — the Shimano BB-RS501 is the correct bottom bracket for the Senicx PR3 crankset on BSA 68mm English threaded frames. No separate BB purchase required for Passage or Passage Pro builds.

Brakes not included — the SRX Pro levers are compatible with all standard cable-pull mechanical disc and rim brake calipers. For a complete build on the Passage, pair with TRP Spyre post mount calipers and Jagwire KEB-SL compressionless housing — both available in our range.

Cables not included — a shift cable is included with the SRX Pro shifter. Brake cables and housing are sold separately.

Perfect For

Gravel, cyclocross, and all-road drop bar builds where 1x11 gearing is the goal and budget matters. Riders building the Evercoast Passage SRX — this is the exact drivetrain specification for that build. Anyone who wants a complete, ready-to-install 1x11 drop bar drivetrain without the cost of a Shimano GRX groupset.

Complete 1x11 drivetrain kit — shifters, derailleur, crankset, bottom bracket, cassette, and chain. Brakes, brake cables, and housing sold separately.