Supercycle of today is a joke.
My girlfriend's boys ride a pair of 'then' new Supercycle MTBs purchased for them.
They know nothing of bicycling, so I had to step in to do the wrenching. Two same model bikes, with parts that didn't match. WTF! Like as if whatever was dumped in their parts bin. Poor assembly, constantly going out of tune. Horrible.

If the old bike has any form of quality, and is ridable, save it. If a part is better served elsewhere on a better more prized bike.....well, I wouldn't shed a tear.