I just need a $150~250 bike to bike over weekends. Walmart has a bike with disc brake but as the wheel turns I can hear friction between brake pad and disc. It is either the disc caliber not well adjusted or the disc might be warped.
Does disc brake requires frequent adjustment so pads don't touch the disc? Will the disc warp easily over time (in that case no amount of adjustment will make the noise go away)? How easy in general it is to adjust the clearance between pad and the disc?
I may just choose to go with models with rim brakes only. But I quite like one model other than it has this disc brake in front.
