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The first components we chose for our Street Smart Windsor’s five-lug upgrade were the brakes. We went with Baer Brakes’ Track4 front system (PN 4261276R; $1,395). Though not as inexpensive as a simple rotor upgrade, the system is very reasonable for a performance-disc-brake upgrade. It utilizes a modified stock spindle, 12-inch rotors, and four-piston calipers, and comes completely assembled as shown.