If you use the minilite caliper, which I don't recommend, your only option for vented rotors is MCP's vented kit which is an European shifter kart front rotor turned down in diameter a bit and fitted to a custom mcp 3 prong hub (won't fit the standard minilite 3 prong without mods). I guess you could fabricate a relocation bracket and use a standard Euro rear brake but then you'll have to manufacture a spacer from 40mm to 1.25" with keyways for each -- not fun. So, I'd get a standard MCP caliper setup and a Ripley rotor from Comet Kart Sales or similar... The Seay SuperBrake is nice, but I've heard that the aluminum expands and can cause bind -- perhaps they've solved that issue? I know Seay offers good products, so it wouldn't surprise me if they fixed that issue... Good luck!