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