Keep in mind that ramp angle will also affect and be affected by forward lean. Externally and internally in opposite ways but still connected.
Someone did a ramp angle (internal) study at Uof C in the summer and I went in for it. Basically you balanced on a boogie board and then they dropped a weight on it and with fancy movement measuring gizmos they calculated how long it took you to recover. This was done with 6 or 8 different configurations in the boot and compared the results. There was no ramp angle on the board you stood on and you weren't clamped in to bindings or anything.
She said I had one of the lowest ramp angles in my boots that she had seen (Atomic RT). Building up the ramp angle felt brutal. I guess it was still summer but I felt like I couldn't even ski in these things. I was quite surprised by it. As she got the boots back to their normal I got dramatically better and she thought it was a matter of just being used to it. However at a flat or even negative ramp angle in the boot I was even measurably a bit better which surprised her and me.
I wanted to test again in a second boot with similar ramp angle but less forward lean to see that impact but I couldn't get a hold of the boots in time. She was supposed to follow up in the winter but I haven't heard from her. I'm guessing a ramp angle in the binding would have made the negative internal angle feel badly.
That's how it worked out for me but my guess is she saw hugely different results for different people. I also don't think she had considered the impact of forward lean on each boot and skier. It did shock me though just how dramatically the internal ramp angle could change ability to balance.
It's not so much the model year, it's the high mileage or meterage to keep the youth of Canada happy
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