The LTWOO GRT Disc 1x12s groupset offers excellent shifting performance and lightweight carbon components at a competitive price, but braking issues such as excessive lever travel and lack of free stroke adjustment are common concerns.
Pros
- Excellent shifting performance, smooth and predictable
- Fully hydraulic disc braking with good power
- Lightweight carbon fiber components
- Clutch mechanism reduces chain slap
Cons
- Brake lever travel excessive even after re-bleeding
- No free stroke adjustment
- No brake lever reach adjustment
- Shifters have a rattling issue
Key Facts
- 1x12 gravel-specific configuration with carbon fiber rear derailleur cage
- Weighs 1087-1154g (lighter than Shimano GRX)
- Compatible with up to 11-50T cassette
Reviews & Ratings
The reviewer tests the LTWOO GRT Disc 1x12s gravel hydraulic shifter with ZRACE XG flat mount brake caliper. He notes the shifter design is heavily inspired by Shimano, with the brake lever used for downshifting and a small paddle behind it for upshifting. The shifting performance is praised as very close to Shimano quality, smooth and predictable. However, the braking has excessive lever travel even after re-bleeding, which the reviewer suspects may be due to mismatched calipers (ZRACE XG) not being the intended L2 calipers. The build quality is good, and the price is around £229 on AliExpress, but the reviewer notes that Shimano GRX 1x12 is only slightly more expensive, making the value proposition less clear.
AI Summary
Pros
- Shifting is phenomenal, smooth, light, and predictable, very close to Shimano quality.
- Build quality is nice, especially the rubber on the hoods.
- Installation is straightforward with good access to bolts and bleed ports.
- Compatible with 11-50T cassette, shifting flawless even on largest sprocket.
- Weight is almost identical to Shimano GRX (1154g vs 1165g).
Cons
- Brake lever travel is excessive even after re-bleeding, lacking free stroke adjustment.
- Brake calipers (ZRACE XG) may not be the intended L2 calipers, possibly causing the lever travel issue.
- Replacing shift cable may be difficult due to cable entry port location under the rubber hood.
- Price (£229) is not significantly cheaper than Shimano GRX 1x12 ($249 for shifters and calipers).
Key Points
- Shifter uses brake lever to downshift and a small paddle behind it to upshift (Shimano-style).
- Compatible with 12-speed, maximum cassette size 11-50T.
- Uses BH59 standard hoses and fittings.
- Weights: both shifters 582g, rear derailleur 298g, total with calipers 1154g.
- Price on AliExpress: approximately £229 for shifters, derailleur, and calipers.
- No free stroke adjustment found; reach adjustment screw is present.
- Reviewer suspects lever travel issue may be due to using ZRACE XG calipers instead of L2's own calipers.
The reviewer discusses the LTWOO GRT Disc 1x12s Gravel Hydraulic Disc Shifter + ZRACE XG Flat Mount Brake Caliper extensively, highlighting its features, performance, and value. They note that the groupset offers fully hydraulic disc braking, a 1x12 gravel-specific configuration, and carbon fiber components. The reviewer praises its shifting performance, braking power, and clutch mechanism, but also mentions some minor issues like rattling in the shifters and lack of brake lever reach adjustment.
AI Summary
Pros
- Fully hydraulic disc braking
- Excellent value for money
- Good shifting performance
- Carbon fiber components
- Clutch mechanism reduces chain slap
- Lightweight compared to Shimano GRX
- Easy to install and bleed
- Stock brake pads perform well in wet and dry conditions
- Compatible with generic Shimano brake pads
- Can shift multiple gears at once
Cons
- Shifters have a rattling issue
- No brake lever reach adjustment
- Free stroke adjustment grub screw is not captive
- Front brake lever snapped during a crash test
Key Points
- 1x12 gravel-specific configuration
- Carbon fiber rear derailleur cage
- Narrow-wide pulley wheels for better chain grip
- Friction-type clutch mechanism
- Weighs 1087 grams (lighter than Shimano GRX)
- Priced around £330 with shipping
- Comes with high-quality polished and Teflon-coated cables
- Ceramic and copper compound brake pads included
- Can handle up to a 50-tooth cassette
The reviewer briefly mentions the LTWOO GRT Disc 1x12s Gravel Hydraulic Disc Shifter + ZRACE XG Flat Mount Brake Caliper,Carbon Fibre,Benchmark GRX| | but does not provide detailed analysis.
AI Summary
Where to Buy
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Specifications
Attributes
Included Components
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