TW3900XC - Twitter AL6061 Mountain Bike

Key Components

• Frame Size: 29" (27.5") × 15" / 17" / 19"

• Bike Colors: White / Dark Gray / Earth Blue

• Net Weight: 13.6 kg (all configurations)

Frame & Structure

• Frame: TW3900XC, MTB geometry, AL6061 aluminum alloy, smooth welding, internal cables, gloss paint with UV decals

• Fork: TW aluminum alloy coil suspension fork with manual lockout

• Seat Post: Aluminum alloy, 31.6×350 mm

• Handlebar Set: Aluminum alloy matte handlebar (31.8×720 mm) with 90 mm stem

• Clamps: Aluminum alloy quick-release 34.9 mm

• Head Set: CNC aluminum alloy, 44×44 mm

• Washer: Aluminum alloy, 3×28.6×10 mm

Drivetrain Options

Variant 1 – SHIMANO M315 3×8-Speed

• System: SHIMANO M315 3×8-speed

• Shifters: SHIMANO M315 3×8-speed

• Front Derailleur: SHIMANO TY500

• Rear Derailleur: SHIMANO TY300

• Crankset: Prowheel aluminum alloy, square axis 24/34/42T

• Cassette: SUGEK 8-speed, 11–32T

• Chain: SUMC 8-speed

• Bottom Bracket: Kenli square axis, bearings, BB68 threaded

Variant 2 – LTWOO 3×10-Speed (RETROSPEC)

• System: RETROSPEC (LTWOO) 3×10-speed

• Shifters: RETROSPEC (LTWOO) 3×10-speed

• Front Derailleur: RETROSPEC (LTWOO) 3-speed

• Rear Derailleur: RETROSPEC (LTWOO) 10-speed

• Crankset: RS aluminum alloy, hollow 24/32/42T

• Cassette: SUGEK 10-speed, 11–36T

• Chain: SUMC 10-speed

• Bottom Bracket: Hollow, BSA68×24 threaded, sealed bearings

Variant 3 – LTWOO 2×12-Speed (RETROSPEC)

• System: RETROSPEC (LTWOO) 2×12-speed

• Shifters: RETROSPEC (LTWOO) 2×12-speed

• Front Derailleur: RETROSPEC (LTWOO) 2-speed

• Rear Derailleur: RETROSPEC (LTWOO) 12-speed

• Crankset: RS aluminum alloy, hollow 28/38T

• Cassette: SUNSHINE 12-speed, 11–42T

• Chain: SUMC 12-speed

• Bottom Bracket: Hollow, BSA68×24 threaded, sealed bearings

Wheelset & Tires

• Hubs: RS aluminum alloy, 2 sealed bearings, slotted design, 32 holes, disc-compatible

• Rims: RS aluminum alloy, double-wall with rivets, W25×H21 mm

• Spokes: SHUNJIU circular 14G

• Tires: INNOVA-PRO 29" / 27.5" × 2.1", black

Braking System

• Brakes: TEKTRO hydraulic disc brakes, 160 mm front / 160 mm rear rotors

Additional Components

• Grips: Circular 22.2×120 mm, comfortable MTB style

• Saddle: Lightweight and ergonomic for MTB riding

• Pedals: Lightweight, skid-resistant

• Cables: JAGWIRE internal & external routing

Included Accessories

• Standard safety reflectors (handlebar, seat post, front & rear wheel)

• PC bottle cage + tools + rear kickstand

• TW manual + warranty card