A friend and I were goofing around on our bikes and came out with, what I think, a couple decent shots. Obviously they could be a little clearer/sharper but the sun was going down and we were running out of light
They look fun! And you're already better than I am, and I've tried panning photos several times before. I don't seem to get any of them really right. While your second one here - other than that it's composition is not quite the best - is really good. (The rider has less room within the frame to ride into, and dynamic as your photo DID come out, it looks like he's going to crash against the lefthand frame any time soon ).