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

The shifters weigh 582g, brakes with hoses and adapters 372g, rear derailleur 218g, and front derailleur 108g. Total system weight is around 1280g without cranks, cassette, chain, and rotors.

Yes, the shifters use Shimano 11/12-speed pull ratios and work with Shimano road derailleurs like 105, Ultegra, and GRX. Many users have successfully mixed them.

Use syringes at both the lever and caliper, push fluid back and forth until no bubbles appear, then close the system. Overbleeding (without bleed block) and rotating the bike to dislodge air can help. The free stroke screw should be fully backed out before bleeding.

The calipers accept Shimano L05A style pads, but L-TWOO also has its own 'eggroll' design pads that work well. Some users have successfully used Shimano K03S and L02A pads.

Yes, many users have successfully used an 11-speed Shimano 105 rear derailleur with a 12-speed cassette and L-TWOO 12-speed shifters, as the pull ratio is compatible.

Yes, the hose and fluid are compatible. Users have paired L-TWOO shifters with Shimano GRX calipers and Ultegra calipers without issues.

The RX road rear derailleur is officially rated for up to 36T, but some users have used larger cassettes with mixed results. The gravel GRT/GR9 versions support up to 50-52T.

There is a grub screw on the shifter body (often near the clamp) that adjusts the ratchet engagement. Turning it can increase or decrease the force needed to shift.

Replacement parts are scarce. Some sellers on AliExpress may provide warranty replacements, but individual parts like shift levers are often not sold separately.

The RX is 12-speed, while the R9 is 11-speed. The RX has a carbon cage rear derailleur and lighter B-axle screw, while the R9 may have steel parts. Both share similar design and hydraulic brakes.