I'm with the Wiz on this. Although ⅜" is probably workable it wouldn't be my first choice for working on my bike. I use my 1-20 N•m wrench about 5x more than I use my ⅜" wrench which I only use on cassettes and crank bolts really. Fitting a larger wrench into tighter spaces on a bike can be a challenge as well as the mentioned inaccuracies near the lowest values. If it were me I would try to find a good ¼" with lower torque values and get something like a Harbor Freight type ⅜" for the bigger stuff since I'm less concerned with being a few % off on something that gets tightened to 40 N•m.