Modern design, carefully casting every bike 21-speed top version Front fork: thickened shock-absorbing front fork Variable speed: 21-speed micro-turn kit Front derailleur: 21-speed micro-turn kit Rear derailleur: 21-speed micro-turn kit Brakes: front and rear mechanical disc brakes Talen: 7-piece flywheel Rim: Double-layer aluminum alloy Bottom axis: 3S ball Tires: Bold non-slip tires NOTICE: ☀ Please use the transmission correctly. Incorrect gear matching will bring a burden to the transmission system, and long-term use will shorten the service life of the transmission. Riding with the wrong gear can drive normally, but the chain is inclined from above. Yes, over time, the chain will become loose or even broken. If used indiscriminately, it will only aggravate the mechanical wear of the chain, flywheel and chainring. ☀ The transportation of large bicycles is difficult, Can not completely avoid a small amount of paint peeling.It cannot be returned as a quality problem!
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