Therefore, the present invention has effects that it reduces a feeling of {HEAD ~ fatigue}, increases the quantity of {TAIL ~ motion}, and allows a user to enjoy riding a bicycle with more interest 
Therefore , the present invention has effects that it reduces a feeling of { HEAD ~ fatigue } , increases the quantity of { TAIL ~ motion } , and allows a user to enjoy riding a bicycle with more interest
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH