Weather is getting warmer and its time to build some bikes again! Only problem is i cant seem to find where i was told which version of the 4G trans to buy, the seller has these options: 20Tx80TFW x 9T/10T 20Tx100TFW x 9T/10T 20Tx100T x 12TFW from what i can recall, TFW = Toothed Free Wheel? and if so,wasn't there an issue with a specific one of these models years ago? Ive bought from these guys last year and the kit had "2015" all over it, i was thinking it was pre 2014 that one way bearings or free wheels were breaking on these? sucks getting old,cant remember stuff. anyways,id appreciate some direction on which one to buy,thxs!