Regarding the wheels on ezip and similardeartment store bikes .... I consider them completely usable for people my size (130lbs), but would also caution people that after 5 years the wheels and probably many other parts of the bike will be unusable. The brakes and shifters on the other hand are probably good for a year or two if used in dry conditions only... and a month or two if used primarily in wet weather.

If you are okay with a bike that is junk after a few hundred uses you are good. (Quite possibly less than a dollar per day of travel... beats public transportation on price