|The standard mounting hardware for Honjo fenders does not rely on threaded eyelets on the bicycle frame. Rather, a nut retains the mounting assembly to the eyelet. This can be a problem where there isn't enough clearance, for example, between the outside rear cog and the rear seatstay.
R-type hardware uses the threads in eyelets as typically found on bikes today. This eliminates the nut on the backside of the eyelet.