I have done this several times now, when shifting in to the big gear (usually going down hill) the chain runs out the right side and drops on the crank. I haven't seen it do this when I am shifting when on flatter surfaces, and to be honest I haven't looked to see what my cadence was when going down the hill. Would pedaling too fast when shifting cause this? or am I looking at an adjustment being needed somewhere?

Thanks

-Ron