That's a good question and a worthy quest what are or is a good pad?
Presently I got Jagwire on the rear from REI cost $15.00 and I don't recommend them but I had to do something quick cuz the bike brand new still has paint on the rims and the brakes were just 1" and I'm having a horrible time braking half to strangle the hell out of the hand grips to stop.
I got another pair order coming thru the mail should be here late Thursday I'm just ordering n there ad best rubber made for braking, I hope that's Black-burn V brakes.
I never thought there was too much of a problem with Bell Brakes but Walmart not in stock went to 3 Walmarts all space 5 miles apart out stock. But until I try these Black-burn I would say Bell.