The 14.4V version runs 570 rpm. With an 80mm wheel, that's a tad slow. (.08*p*570*60/1000=) 8.5 km/h. @6S = 13km/h still on the slow side

I'm going to use a 170mm Grafix/Flex wheel on the 9.6V set I have. Wat gives me 16km/h with 3S

The ali for the adaptors is sitting in the lathe , bought myself a 3/8 UNF tap and die set. I have high hopes for this.

It's 850 grams lighter than a set of Speed 900 MSR 12-54's , and 500 gram lighter than the Speed 700 KOS 12-36-12-72 setup I have around.