Just picked up a Schwinn Impact MOS for about the cost of one of the tires on it. Same frame as the Impact Pro MOS, just a "lower" Suntour XCT Accushift 3x7 group vs Shimano 300LX on the Pro. Purchased from the original owner who says its all original, minus consumables. Looks to be right in that Suntour "indexing hell/death throws" era. Pretty grimy, so I might just Frankenstein it together with some nicer parts I have lying around.
