Wondering about the difference between SG-S500 and SG-S501 8spd Alfine hub versions? Shimano says: "Roller clutches are used in place of ratchet pawls to reduce noise. The new hubs are now almost completely silent, there is only a ratcheting noise when backpedaling. There is also a new...
上联:Ag Zn Na F Ga Hf Mg 下联:Re Sg Tc Au As Sc Ti 2月6日,甘肃庆阳街头 一女生用化学元素写春联引路人围观 上联:Ag Zn Na F Ga Hf Mg 下联:Re Sg Tc Au As Sc Ti 横批:F cl CHO CHO 你看懂了吗? ...