Wow! You are certainly not lacking in ambition in tackling a 15% grade!
Getting up hills is purely a matter of how many watts you generate in relation to how much you weigh. If you happen to be on the petite/slim side (and fit), then you might find hills are fast friends. If you aren't, then maybe things won't be quite as friendly
Personally I try to avoid any sustained (as in long stretches) climbing at over 6-7% or so. Unless you generate mass power, and I definitely do not, then your cadence is going to drop way, way down once you get into those really steep grades and that means the force of each pedal stroke goes up correspondingly.
Maybe if your knees are A-ok then no problem but mine are far from it so self-preservation is my motto![]()




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