I've been doing higher RPMs for a while now (I'm going to guess about 80) but I think this may have impacted my knees more. I've shifted to higher gears to try

I've been doing higher RPMs for a while now (I'm going to guess about 80) but I think this may have impacted my knees more. I've shifted to higher gears to try and reduce the number of repetitions my joints have to do, to shift load to the muscles