jb-K

I would edit that 'seem' to read 'see', but the edit mode of this interface is showing me a blank text entry box, without giving me my text to work on. That seems like a forms error similar to the forms error I get when i try to flag a trail report that has inaccurate information, but i'm not going to stress it.

I just caught the winning video and was surprised by the comparative generosity of the grand prize, as in, jeez if i'd known an xtr groupset was on the table i would have gone all in on this. But, I hadn't heard about the contest and missed out. So I came here to find out what it was. Surprise, lotta disgruntled t'forks users out there. I don't use the app myself, just use it at home on desktop to keep tabs on trail building and maintenance. I've always found it helpful for that. But as some have suggested, if t'forks is going to be more proactive, run contests and engage with users, then it's high time for t'forks to find a way to involve trail associations and builders on the maintenance side of things, moreso than just riders. Because, and this is just a coincidence, the winner of this contest won it riding on the trails which I help maintain, and which are generally considered unrideable during the contest period, due to the spring thaw. So get in the game t'forks, let's seem some smarter engagement!

From what I can see, what's missing in the argument here is the rider's velocity. At near-zero velocity as the rider drops in and begins rapid acceleration, the ground reaction force is indeed perpendicular to the slope, and the rider should stay in a neutral centred position to maintain weight distribution equally between the wheels. As the rider accelerates towards terminal velocity (due either to air friction or the gradual application of brakes), the ground reaction force tips uphill, until it becomes anti-parallel to gravity at terminal velocity (ie when the acceleration is now zero). At terminal velocity, the centre of mass should now be vertically aligned over the centre of balance between then two wheels, assuming near-equal weight distribution between tires is still desired, and that means effectively the rider is now shifted backwards from the neutral position.