models

Hello all, I just ordered a new M line. This is my 3rd Bennington and I’ve never really educated myself on the model letters and their meaning. Mine is a 22 MFBSE- the M is obvious (M series) is the FB for fastback? SE for the elliptical too upgrade? Just curious. Let me know your thoughts!

Does anyone have information on the new RX Sport Series that has appeared on the Design Build page? No image has been posted yet. I assume this is a new model coming for 2019?