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@rpm
sounds like you'll shag your knees up. 108 odd gear inches on the road is quite ridiculous. Chris Hoy uses 98 for 200m sprints.
you need to spin to build the muscles initially, then you can bulk up with occasional higher geared rides and weight training.
if your 20-30 miles a day is a commute, in traffic with lots of stop-starting then it's trash mileage. you need to do long rides without too many interruptions. In the cuntryside, round a large park or even on rollers or turbo trainer.
I don't think that pushing a huge gear around the road has ever been recommended for building muscles or any other kind of training.