Big gives some advantages in the super strong rider dept but in clycling i have seen small guy with a lot of power, big guys that can climb, small guys that can TT... you have bio types but you cant take it as a rule of thumb because if the guy really suck at riding a bike he can have an air made bike plus 3% of fat and he will be smoked by a fatty good rider w/o any problem.

Sprinters.. koichi Nakano... he was short compared with other sprinters and even compared with modern sprinters but he won world titles years in a row. Miguel indurain is a darn big guy and not light at all.. he was able to climb... the kaiser climbed too... reg harris, he was just normal in a matter of fact if you see pictures the guy to me was just normal sized for a sprinter. Steve hegg for example, he isnt tall and IMO he doesnt look like a time trialist but he kicked butt in the pursuit at the olympics back in the day.

COntador is regular size... and super light but he can TT like the big guys w/o any problem. Manx man, to me he looks like a weekend warrior, curiously he can sprint a lot and he is short and dont even look like a sprinter. Teo Bos is the classic light sprinter, he even look like a regular road racer but he got serveral track sprint world tittles, probably in the track not even Manx man can do his magic against him.

IMO is not a thing of size it is a thing of "the rider is good or not". you can't judge the book from looking at the covers. You can speculate or guess but never judge...