Odd issue on a Giant Boulder . When applying a lot of torque, the rear brake pads rub against the rim. Pretty much slows down the rear wheel to a stop. The bike rolls under normal pedaling. I've tried adjusting the brake pads up and down and also lengthened the brake cable. This only reduced it to almost no braking power.
I assume it's the brake pads because it sounds like a rubber grinding noise.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Lever brakes rubbing