Originally Posted by
uratex1
Everything is low end. I bought the bike brand new for about 100USD. I changed the FD to a Deore M590 used and RD to a non-series shimano.
A $100 USD new bike is usually in no way, shape, or form, worth upgrading unless you have all the parts for free and can do the work yourself. Keep the original stuff maintained and save your money for a better bike.