adey said:
yeah you don't have to put your knee down. but there is a benefit. you use it to gauge your ground clearance.
No question that top racers do judge their ground clearance this way. But I'll bet good money that 90%+ of us mere mortals who get a knee down are doing it by sticking their knee out farther than they have to, and quite often farther than they should be, just to be able to say that they scrapped their knee or to look cool.
If you are artificially putting your knee way out there, it may touch down, but it isn't providing you any useful information as you'll really have a lot more lean left than you'll think you have.
Getting a knee on the pavement has become a status symbol. And frankly, most of the time it's meaningless. I've seen so many guys hanging _way_ too far off their bike, to the point that it upsets their handling and control just to try to get their knee down. They think this makes them faster, while most of the time, a skilled and composed rider will blow right past them without anything touching down...
and i can tell from the angle of the bike and your position that you speed isn't that fast into the corner.
That pic was entering turn 3 of Willow Springs (big track), it was pre-apex and did not happen to catch the maximum lean angle so you can't judge my speed by a single random frame. Believe me, I had the exit of turn 2 nailed that day and way carrying way more speed into 3 than just about anyone (other than Reg and Fred). I was stuffing people into that corner all day long.
The point of the photo (and my comment) wasn't "look how far I can lean!", but an example of a riding form that doesn't emphasize getting a knee down, and in fact prevents it, but still lets you go fast by keeping the bike under control.
trust me...the faster you go the more you have to lean. and your knee will touch. if it doesn't then your toe will touch. when it happened to me, i had stock pegs. so my pegs scraped, then toe then my knee. that was because i was hugging the tank with my outside leg.
My speed is not the issue, I've dragged my toes, and pegs and other parts of the bike (more on my BMW than my R1), but I've never had a knee on the pavement and don't need to (on the street at least, if I were racing I might have a slightly different story...).
My bottom line point here is that getting a knee down doesn't make you a better rider, and doesn't prove that you're faster either. Most riders will benefit more from working on their upper body position (head, shoulders, elbows), followed by their hip and butt position, without worrying about trying to get a knee on the pavement.
For those not riding 10/10ths on a track, there's probably more benefit to be had by keeping a solid grip on the bike with both ankles and knees, than by trying to look cool with your knee in the breeze.
Personally I have a _lot_ of steering input from my ankles (you should see how worn the inside ankles of my boots are) and by keeping both knees on the bike I can shift my body weight back and forth entirely with my legs. This lets me keep my arms relaxed and I don't put any unwanted input into the grips by trying to pull myself back up onto the bike after a corner.