Back spacing with disc and drum brakes

[theastronaut]

Yes, the rear wheels are a good bit deeper than the front wheels. The backspacing isn’t what makes the wheel clear the caliper, it’s the shape of the inner barrel. Stock drum brake wheels are a 45* tapered design and need to be spaced out around 1/2” to clear, but disc brake wheels have a 90* step design that clears without spacers. So you could have any backspacing as long as the inner barrel has a 90* step. I can post pics of the difference tomorrow.