关于自行车的问题...有前后变速的自行车在爬坡和下坡的时候如何调速比较好?
今天爬坡差点累死我
both left and right hand rotate the speed
controller to outside, then it will be the least load! good for riding up!
reversely, it is the heavist, but fastest if u ride in normal road!
reversely, it is the heavist, but fastest if u ride in normal road!