*Hydraulic Disc Brake UpgradePre-order, expected to ship around 90 business days after payment.We recommend that the bike be purchased with the hydraulic Disc Brake. Because it's hard for you to install it by yourself.But we will install the hydraulic disc brake for you before shipping out your bike if you order it with the bike.If you only buy the hydraulic disc brake, we can only guarantee the quality of the hydraulic disc brake before shipment. We will not responsible if the assembly is unsuccessful or the hydraulic disc brake has any problems during the assembly process.
