Yes, it's the wheel base measured axle to axle. Just set your bike on them and use a plumb bob at the front axle to get get them set up right. (You'll be fine even if you're off by a hole either way.) I have rode my Cross Check (1015mm wheelbase) on them while they were set up for my fixed conversion (1045 mm) and vice versa and never had a crash because of the difference. They are more stable if you get it close though.