DS (Dual slalom): Double Tournament curv

DS (Dual slalom): Double Tournament curve, similar to 4X

China often say that the chartered flight

Often called the DS. Tires with coarse particles, so the use of 120MM suspension fork,
With the rear derailleur. And to support the market in front of the chain guide (to be installed in front of the shift, but in the game when no one is using the basic front derailleur)
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