Is there any noticeable difference between a clincher or tubular aero wheel in a race with or without hills. I have read lots of posts where there is and where a mortal can't tell. Also about the hills only playing a big part if it is longer than a mile. Ive read where zipp 404 clinchers will be faster on a straight and a 404 tub's is faster up a hill. I guess I was wondering how much of a difference is there going up a hill with the weight difference. I see lots of riders attacking a hill with cheap wheels and passing those with much lighter wheels and this is in crit races and tri's. Just need a better understanding. Also to add if clinchers a bad for races other than tt's and tri's why are there so many people riding on them. Your opinion is appreciated.