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