Clem Smith Jr. is Rivendell’s fat-tire, easy to fender & rack, joyously upright and stable, and more affordable than the rest of their lineup bicycle frame. The "L" version is "Low top-tube".
They're more affordable only because most of the joints are tig-welded instead of lugged. Tigs cut the construction time for each frame down by a lot so the price gets lower. It's a perfectly strong way to make a bicycle, although not as pretty to look at as lugs.
Clems still have a strong wide fork crown, napkin-ring reinforcement lugs at the headtube, and a beautiful well-designed seatlug, so it looks far from a generic bike.
These are made by the same people who make the more expensive frames and with the same materials even. Just no lugs (lugs are expensive).
FRAME SIZES/WHEEL SIZES:
45cm / 650b / 27.5 inch new mountain bikey size wheels.
52cm / 650b / 27.5-inch new mountain bikey size wheels.
59cm / 700c rim size, but with room for "29er" tires
64cm / 700c rim size, but with room for "29er" tires
Seatpost Dimensions — 26.8mm for 45cm and 52cm and 29.8mm for 59cm and 64cm
PBH ranges:
45cm - 68 to 81cm
52cm - 74 to 88cm
59cm - 86 to 96cm
64cm - 93 to 101cm
Pick the frame size that your PBH falls most in the middle of the range. The large frames have the curved seatstays and simpler seat-cluster. The small frames have straight stays and the fancy seat-cluster.
Framesets include an FSA Duron 1" threaded headset and a seat post.