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So, did jcook convince you of the error in your ways? Or do you still believe your initial claim? "If you took two bikes with different wheelsize and rolled them down a smooth hill with no rider the bigger wheel would be faster." Also, my horse is perfectly sober. This one seems pretty easy and can be broken down to...

What makes the larger wheels roll faster? What force acts on 29" wheels that doesn't effect 27.5" wheels? Momentum is different. Acceleration and deceleration would be different. But, on a smooth hill with no rider one would not be "faster" than the other. I don't think...

What dynamics book are you reading? That is just plain wrong. Gravity doesn't care how big your wheels are.

So are you saying that a worse rider will win on a better bike. I think the rider has a lot more to do with it than the bike. But, we want the technology to continue to improve. We want the two wheeled machine that goes down the hill the fastest to be the machine that all they racers use...

What is the point of racing if not to see who can go the fastest? The tech is a huge part of that. Should everyone have the same brakes, wheels, tires, drive train, suspension, frame, etc. as well? We want to see whatever bike/component/geometry that is fastest show up and race. And if someone wants to try to race on...