Teen Student Variable‑Speed Mountain Bike

功能：培林花鼓；高碳钢内走线抗压车架；38管加粗减震前叉60肩；2.125足宽车胎-带标；全轴承传送系统；定位七飞；中鱼腿定位小三片；高弹舒适专用车座；前后机械碟刹；环保内贴高档烤漆；泰昌51-3-7-21速；美卡纸箱85%组装；铁黑砂W580小燕把+铝合金把立；铝合金双层抗压刀圈

Functions：Hub: Bearing cassette hub

Frame: High‑carbon steel pressure‑resistant frame with internal cable routing

Front Fork: 38mm thickened shock‑absorbing fork, 60‑mm shoulder

Tire: Full‑width 2.125 branded tires

Drivetrain: Full‑bearing transmission system

Cassette: Indexed 7‑speed freewheel

Crankset: Indexed triple crank arms

Saddle: High‑elastic ergonomic comfort saddle

Brakes: Front & rear mechanical disc brakes

Surface Finish: Premium baking paint with eco‑friendly inner decals

Gear System: Taichang 51‑3‑7‑21‑speed

Handlebar & Stem: Iron black‑sand W580 swallow handlebar + aluminum alloy stem

Rims: Aluminum alloy double‑layer pressure‑resistant knife‑edged rims

Packaging: US‑spec carton, 85% pre‑assembled

包装尺寸/Package Size：

产品尺寸/Product Size：

净重/ (N.W.)-毛重/(G.W.)：

选配/Optional Accessories：20inch/22inch

装箱数pcs/ctn:1pcs