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