lol, don't feel bad, but the little question mark help thing by the tire field does say "Enter the
total tire diameter in inches, which includes the rim."
Just giving you a hard time.
For 2s, I would get a 6L or an 8S.
lincpimp: I agree with your assessment of the S motors vs the MM motors even though I've never had an S motor. They have the same outside dimensions, but the coils on the MM are substantially shorter yielding less torque. And if the XL motors are any guide, the Feigaos look like they have tighter winds. So, it makes sense.