I figured if any bike riders knew of a source of afffordable large chainrings (65T - 80T) that the recumbent riders would know the source. I have looked around and found that greenspeed sells large chainrings in that range; however, they can get pretty pricey in the range of $200 for one large chainring. I have also seen what the hostel shop has to offer. It would be nice if I didn't have to spend lots of time on google if anybody here knew one off of the top of thier head. FYI, I am thinking of mating a large chainring to a capreo cassette.