i can't spin effectively on climbs. i find i naturally seek out what ever gear gives me about 60 rpms...and this is how i climb the fastest. on the flats or not so steep climbs i feel more comforable spinning but when it gets steep (>7%) i move back and mash. based on observation, it seems like alot of riders do this. if i gear down and pick up the cadence, my riding partner (reference) starts to pull away. it seems like the rest period i get between mashes is critical so i seek out a cadence where the rest period is enough to sustain the mashes. i've played with this alot and havent been able to increase my cadence without slowing down.