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L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset
Groupset

L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset

Weight1086g
CategoryGroupset

The L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset offers excellent value and performance, often compared favorably to Shimano 105, but has notable issues with brake lever travel, bleeding complexity, and occasional quality control problems. Most reviewers found shifting crisp and reliable after setup, and brakes powerful once adjusted, but installation and setup can be challenging for beginners.

Pros

  • Excellent value for money, with prices around £200-£350, significantly cheaper than Shimano 105.12
  • Shifting performance is crisp and reliable after proper setup, often compared to Shimano 105.345
  • Braking performance is strong and powerful once adjusted, with good modulation.12
  • Lightweight compared to Shimano 105, especially the carbon version (876g vs 930g).14
  • Comes with pre-bled hoses and comprehensive mounting hardware, including adapters for various rotor sizes.612
  • Compatible with Shimano cassettes, chains, and brake pads, making replacement parts easy to find.14
  • Ergonomic hoods with comfortable shape and grippy texture, similar to SRAM.12
  • Free stroke adjustment on brake levers allows customization of lever feel.31

Cons

  • Brake lever travel is too long out of the box, causing a spongy feel; adjustment screw fixes it but may not be obvious.34
  • Bleeding the brakes is tricky due to non-standard bleed ports and the need to unscrew the free stroke adjustment screw; can cause issues if not done correctly.17
  • Quality control inconsistencies: misaligned brake caliper mounting holes, paint chipping, and occasional carbon lever breakage.21
  • Shifting feel is not as refined as Shimano, with occasional missed shifts and heavier downshift action.12
  • 12-speed indexing is sensitive to cable tension and component wear, requiring careful adjustment.1
  • Installation can be challenging, especially cable routing and bleeding; some users reported difficulty with shifter mounting screw access.76
  • No rotors included, leading to compatibility issues with Shimano rotors (though adapters are provided).32
  • Ergonomic issues for some users: thumb shifter can be accidentally hit, and downshift button hard to reach from drops.72

Key Facts

  • Claimed weight of 876g for shifters, derailleurs, and brakes (without cables/fluid), about 54g lighter than Shimano 105 disc groupset.1
  • Retail price around 2280 RMB (~£270), but often sold for £350-£390 from resellers.174
  • Uses mineral oil for brakes, compatible with Shimano BH59 hoses and fittings.1
  • Brake calipers are flat-mount (70mm hole spacing) in some versions, but post-mount in others; adapters included for various rotor sizes.16
  • Shifters feature Campagnolo-style thumb paddle and button, allowing multi-gear shifts (up to 3-4 gears).12
  • Rear derailleur has a long cage, supporting up to 34-tooth cassettes (officially) but can handle 36.372
  • Front derailleur includes a built-in barrel adjuster for easier setup.1
  • Brake pads are compatible with Shimano L05A pads and use ceramic pistons.1

Reviews & Ratings

Jourdain Coleman2 videos
08:59
Cheap Chinese Groupset - L-TWOO 12 Speed Hydraulic Carbon - Any Good??

The reviewer purchased an L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset from AliExpress for £355.21. They note that it is a carbon version and that it could potentially replace Shimano 105. The reviewer provides first impressions, mentioning that the components feel solid and well-built, with good tension in the springs and definite shifts. They also comment on the unique thumb shifter design and express curiosity about its real-world performance. The overall weight of the groupset is 1,221 grams (without hydraulic fluid). The reviewer plans to have an expert mechanic install it and will test it on the road in future videos.

January 22, 2023Watch on YouTube
17:21
Expert Mechanic Installs L-TWOO RX Hydraulic Groupset (In-Depth) // Full Build PT2

The reviewer details the installation process of the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset, highlighting that the installation was challenging, particularly with cable routing and bleeding the front brake. A significant issue arose when the front brake could not be bled, which was eventually traced to the lever adjustment screw being fully screwed in, blocking the cylinder. After adjusting the screw, the brake worked. The reviewer notes that the groupset had high expectations but encountered problems, and only 58% of poll respondents said they would buy it.

March 19, 2023Watch on YouTube
Luke D Romano
12:17
MINI GROUPSET LTWOO RX 12 SPEED CARBON ... KASTA TERTINGGI !!!

The transcript does not contain any discussion of the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset.

December 27, 2021Watch on YouTube
Local Alien / CLIFF
10:47
L-TWOO RX Hydraulic Groupset 12 Speed Carbon. I built a bike with Chinese Budget Roadbike Group Set.

The reviewer discusses their experience with the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset, noting its good shifting performance and feel, but mentions some concerns about brake lever travel and initial brake power.

March 25, 2023Watch on YouTube
SURPLACE 700CC
10:47
LTWOO RX 12SPEED OPCIÓN ECONOMICA 12s EXPERIENCIA FALLAS

The reviewer discusses their experience with the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset (though they mention they have the aluminum version). They state that the groupset has met their expectations, functioning well and being comparable to a Shimano 105. They note some minor issues but overall recommend it for the price.

August 16, 2023Watch on YouTube
CADE Media5 videos
08:21
I Bought a 12 Speed Carbon Groupset for £200 - LTWOO RX

The reviewer unboxes and provides a first look at the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset, noting that it is a budget-friendly 12-speed groupset from AliExpress. They comment on its appearance, which is inspired by Campagnolo, and discuss the included components, which are a mix of L-TWOO and Z-Race parts. The reviewer weighs the components and shares their initial impressions, noting that the groupset appears well-made for the price but that the cassette is heavy.

July 06, 2022Watch on YouTube
11:03
Pro Bike Mechanic Vs AliExpress Groupset - LTWOO RX Hydraulic Build

The reviewer, a pro mechanic, finds the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset surprisingly impressive for its price, noting good shifting performance, comfortable hoods, and a clever dual-position lever design. However, he raises concerns about build quality, particularly the misaligned brake caliper mounting holes and chipping paint, and notes that while it doesn't match the big three groupsets in crispness, it shows potential.

March 08, 2023Watch on YouTube
07:03
First Ride On L-TWOO RX Hydraulic Groupset from AliExpress

The reviewer's first ride with the L-TWOO RX 12 Disc 2x12s groupset was marred by a broken left shifter, which snapped off immediately after assembly. Despite this, the brakes were praised as exceptionally good, and the right-hand shifting worked well. The reviewer noted ergonomic issues with the levers and a fiddly reach adjustment mechanism, and expressed concerns about the lack of support from bike shops for such groupsets.

March 16, 2023Watch on YouTube
09:08
£200 Groupset On My £6000 Race Bike - LWTOO RX First Ride and Test

The reviewer installs the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset on a race bike, noting its premium feel and good shifting performance, but highlights issues with brake cable return on internally routed frames and inability to shift from the drops.

September 01, 2022Watch on YouTube
11:57
Can This £300 AliExpress Groupset Beat Shimano 105? - LTWOO RX Hydraulic

The reviewer discusses the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset, which they purchased from AliExpress for 300 pounds. They note it is the first hydraulic groupset from an AliExpress brand and comment on its appearance, saying it looks nice and has gold accents. They weigh the components and compare them to Shimano 105, indicating that 105 is the benchmark. They express excitement to test it on a bike in a future episode.

February 21, 2023Watch on YouTube
Trace Velo9 videos
13:39
Unlocking MAXIMUM performance from your Chinese groupset!

The reviewer discusses the LTWOO (referred to as 'L2' or 'L2 group set') R9 disc groupset, which they state costs 108 quid on AliExpress. They explain that while cheaper groupsets like this are rarely as good as Shimano equivalents out of the box, with specific tweaks they can come incredibly close to Shimano levels of performance. The video is dedicated to sharing tips for improving the performance of this and similar budget groupsets. The tips cover mechanical shifting, cable routing, component wear, shifter rattle, and the specific process for bleeding the hydraulic brakes, including unique features like a grub screw on the brake lever. The reviewer also mentions that newer LTWOO groupsets have a tension adjustment screw on the front derailleur.

December 05, 2025Watch on YouTube
15:28
L-TWOO RX HYDRAULIC - 12 speed Chinese Carbon Groupset - First Look

The reviewer unboxes and provides initial impressions of the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset, highlighting its high-quality materials, thoughtful design improvements over previous versions, and overall positive first impression. They note that while the price was higher than retail due to purchasing from a reseller, the groupset appears to offer good value. They also mention some concerns about the left shifter stiffness and the use of post-mount calipers, but overall they are impressed and eager to test it on a bike.

December 23, 2022Watch on YouTube
23:02
Hydraulic Groupset on a Budget: LTWOO RX at 2000km

The reviewer tested the L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset for six months and 1200 miles. He found it to be a great value, with easy installation, excellent braking performance, and good shifting overall, but noted some issues with 12-speed indexing sensitivity, minor corrosion on some parts, and a potential for carbon lever breakage. He recommends the 11-speed version for better reliability and cost-effectiveness.

June 14, 2023Watch on YouTube
20:21
Possibly the best value groupset in existence!

The reviewer discusses the LTWOO R9 Disc groupset extensively, highlighting its exceptional value as an alternative to Shimano's 105 groupset. They note it offers hydraulic disc brakes and 11-speed functionality at a fraction of Shimano's price (around £140). The reviewer praises the braking performance as 'absolutely fantastic' and mentions good build quality with features like ceramic brake pistons and replaceable jockey wheels. However, they critique the shifting performance as being slightly inferior to Shimano's, particularly in feel and multi-shift reliability, though this improves significantly when modifying the cable routing. The reviewer concludes it's an excellent value proposition despite minor shortcomings.

October 08, 2024Watch on YouTube
40:22
Worth the extra cost? My MOST EXPENSIVE AliExpress bike build

The reviewer discusses the Ltwoo Rx Grt R9 Gr9 Road Bike Hydraulic Disc Brake 11/12s Shifter Carbon Fiber Groupset Hydraulic Caliper Rear Derailleur Set, highlighting its features and initial impressions during installation.

February 08, 2023Watch on YouTube
40:22
Worth the extra cost? My MOST EXPENSIVE AliExpress bike build

The reviewer discusses the LTWOO RX 12 Disc 2x12s Road Hydraulic Disc Brake Groupset, highlighting its features and initial impressions during installation.

February 08, 2023Watch on YouTube
20:39
7 ULTRA Lightweight AliExpress Bike Upgrades

The reviewer discusses the LTWOO RX 12 groupset, specifically mentioning the rear derailleur and brake levers from the 12-speed RX groupset. They note that the rear derailleur, originally from the RX groupset, was used as an upgrade on an 11-speed bike, and it worked flawlessly. The brake levers from the RX groupset were also used as a weight-saving replacement, being significantly lighter than the stock aluminium ones.

August 18, 2026Watch on YouTube
17:37
Easily the Best Value Road Bike You Can Build in 2025!

The reviewer states that the LTWOO R9 Disc groupset is a fantastic option for its unrivaled value. They have used it for well over a year and thousands of miles with zero problems, praising its ergonomics, hydraulic disc brakes, and spot-on shifting.

December 19, 2025Watch on YouTube
20:34
Possibly the best value road bike ever built - Full parts and cost breakdown

The reviewer briefly mentions the LTWOO RX / R9 Disc 2x12s / 2x11s Road Hydraulic Disc Brake Groupset, 6 kit, Benchmark R7170 R8170 but does not provide detailed analysis.

November 28, 2024Watch on YouTube
Tom Bowers Cycling
15:04
I Built a Full Carbon AliExpress Gravel Bike for Under £1000!

The reviewer states that the Ltwoo GR9 groupset inspired the entire project and provides a detailed initial assessment. They are impressed with the finish quality of the shifters and hoods, note the rear derailleur has a strong clutch and large cage for gravel use, and praise the brake calipers' appearance and value.

August 28, 2025Watch on YouTube
Peter Treadway
42:22
This Hydraulic Groupset is SO CHEAP!!!

The reviewer discusses the LTWOO R9 2x11 speed hydraulic disc brake groupset used in a gravel bike build for their son. They mention it's their first time using a budget Chinese groupset from LTWOO and their first experience with hydraulic disc brakes. The groupset arrived well-packed without its original box (a cost-saving measure), and includes shifters, front/rear derailleurs, brake calipers, and hoses. The reviewer notes the brakes came pre-filled with mineral oil and had hoses already terminated into the calipers. Installation required some adjustments, particularly with the shifter mounting screws being awkwardly placed behind the hoods. The reviewer successfully installed and bled the brakes, finding the process less difficult than anticipated.

April 21, 2024Watch on YouTube
China Cycling
28:10
L TWOO RX Hydraulic Groupset: We have a problem (Or two)

The reviewer discusses the LTWOO RX 12 Disc 2x12s Road Hydraulic Disc Brake Groupset extensively throughout the video. They mention that the group set is close to being great but has some issues. The shifting is described as perfect, with crisp and reliable performance, but the brake lever travel is initially too long, making braking feel spongy and less effective, especially in the drops. The reviewer later discovers an adjustment screw that fixes the brake lever issue, significantly improving performance. They also note that the group set does not come with rotors, which causes compatibility issues with Shimano rotors. The reviewer highlights the lack of instructions as a major drawback but ultimately finds the group set to be a promising, affordable option once adjusted properly.

December 26, 2022Watch on YouTube
Purchase

Where to Buy

aliexpress.com
£103.65· 5 stores
View Deals

Specifications

Attributes

Brake TypeHydraulic Disc
Shift TypeMechanical
Speeds12
Chainrings2x
Cassette Range11T-32T
Max Rear Cog32
Has Front DerailleurYes
Crank Spindle Type
Freehub Type
RD Max Capacity

Included Components

L-TWOO RX 12 Disc 2x12s Carbon Road Hydraulic Disc Brake Groupset
Groupset
1,086g
Two brifters (brake levers with integrated shift levers)
Shifters
235g×2
Rear Derailleur
Derailleur (Rear)
266g
Front Derailleur
Derailleur (Front)
94g
Front and Rear brake calipers
Front Brake
128g
Front and Rear brake calipers
Rear Brake
128g
Total Weight2,172g

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