On the beefalo drum on my cb450 project, I had a local machinequote:
I agree with you for stopping power, but if you can have more stopping power and save weight, what would you take? The weight of most these drums is in the lining. The small drums have wider brake pad surface, more lining. It's almost a full half inch wider.
Very important point there. Diameter of the drum is everything. Bigger around and narrow is usually always better, even if swept area is less on the larger diameter. I guess if there is a downside it's that even with a lighter drum a larger diameter moves the weight farther out on the wheel which gives more rotational momentum. I don't know the details but the leverage setup of the mechanism is supposed to mean a lot. I guess that's why the 450 and 160 work so well, something about how the linkage and cams are setup..... and I don't think it's as simple as more is better. Also a big deal is that the pivot side of the shoes on the 160, 305 and 450 wrap completely around the pin like a hinge, whereas the CB350, CB175 etc just have a half round that engages the pin.quote: So, yes, having narrower lining further from the hub will give
you better braking power compared to wider and closer. And if they
weigh the same, the choice is obvious.