Twitter AL6061 Mountain Bike
Twitter TW3900XC Mountain / XC / Alloy Hardtail MTB
Built to take the trail head-on and leave it questioning its life choices. The TW3900XC is a lightweight AL6061 aluminum-alloy XC hardtail engineered for confident climbing and fast, fearless descents. Smooth-welded frame with internal cable routing, coil suspension fork with manual lockout, and hydraulic disc brakes deliver control on every surface. Three drivetrain options let you dial the gearing to whatever the trail throws at you. Wide 29" / 27.5" wheels and double-wall rims keep the momentum rolling from singletrack to open path without apology.
Key Features that don’t mess around: ▪ AL6061 Aluminum-Alloy MTB Frame — smooth welding and internal cable routing for a clean, durable XC platform that refuses to flex under pressure. ▪ Coil Suspension Fork with Manual Lockout — soak up the hits when you want it, lock it out when it’s time to climb like you mean it. ▪ TEKTRO Hydraulic Disc Brakes (160 mm front / 160 mm rear) — strong, consistent, all-weather stopping power that actually works when the trail gets nasty. ▪ Three Drivetrain Configurations — SHIMANO M315 3×8, RS LTWOO 3×10, or RS LTWOO 2×12 so you can match the gearing to your terrain instead of fighting it. ▪ Double-Wall Disc-Compatible Wheelset on sealed-bearing hubs with CST 29" / 27.5" × 2.1" tires — built to keep rolling when lesser wheels start crying. ▪ 720 mm Alloy Cockpit (31.8×720 mm bar, 90 mm stem) with ergonomic MTB grips and saddle — control when the trail turns rough.
ALLOY TRAIL FRAME Lightweight alloy frame with internal routing. Built to make the trail feel easy… or at least easier to dominate.
DROP IN Climbs efficient. Descends fearless. Control when the dirt starts fighting back.
WIDE-RANGE DRIVETRAIN Wide-range gearing for steep climbs and fast descents. Built to take a beating and keep shifting.
Drivetrain Configurations Reliable & Wide-Range SHIMANO M315 — 3×8 Speed (24S) SHIMANO M315 shifters, TY700 front + TY300 rear derailleur, RS aluminum-alloy square-axis 24-34-42T crankset, SUGEK 11–32T 8-speed cassette. Dependable, easy-shifting setup for all-round trail abuse.
More Gears, More Range RS LTWOO — 3×10 Speed (30S) RETROSPEC (LTWOO) 3×10 shifters and derailleurs, RS aluminum-alloy hollow 24-32-42T crankset, SUGEK 11–36T 10-speed cassette. Wider range and tighter steps for varied terrain and longer climbs that try to break your spirit.
1×-Style Simplicity RS LTWOO — 2×12 Speed (24S) RETROSPEC (LTWOO) 2×12 shifters and derailleurs, RS aluminum-alloy hollow 28-38T crankset, huge SUNSHINE 11–42T 12-speed cassette. Massive climbing range with clean, modern shifting that doesn’t overcomplicate the fight.
Specifications (the stuff that holds the line) Frame: TW3900XC, MTB geometry, AL6061 aluminum alloy, smooth welding, internal cable routing Fork: Aluminum alloy suspension fork, coil system with manual lockout Seat Post: Aluminum alloy, 31.6×350 mm Handlebar: Aluminum alloy (31.8×720 mm) with 90 mm stem Headset: Aluminum alloy, 44×44 mm Brakes: TEKTRO hydraulic disc, 160 mm front / 160 mm rear Hubs: RS aluminum alloy, 2 sealed bearings, disc-compatible, 32 holes Rims: RS aluminum alloy, double wall with rivets, W25×H21 mm Spokes: SHUNJIU circular 14G Tires: CST 29" / 27.5" × 2.1" Grips: 22.2×120 mm, comfortable MTB style Saddle: Lightweight and ergonomic for MTB riding Pedals: Lightweight & skid-resistant Frame Size: 29" (27.5") × 15" / 17" / 19" Colors: White · Dark Gray · Matte Black Net Weight: 13.6 KG (all variants)
What’s in the Box Factory pre-assembled Twitter TW3900XC mountain bike Standard safety reflectors (handlebar, seat post, front & rear wheels) Bottle cage + tools + rear kickstand Official manual + Warranty card
This isn’t a bike that hopes the trail is nice. It’s an XC hardtail that shows up ready to climb, drop, and keep rolling while the dirt tries its best to slow you down.