Will a thick wheel fit on a fixie?

Yes, a thick wheel can fit on a fixie, but it depends on the frame and fork's clearance. Many fixie bikes are designed for specific wheel sizes and widths, so it's important to ensure that the new wheel is compatible with the bike's geometry. Additionally, consider the brake setup, as thicker wheels may interfere with calipers or other braking systems. Always check the manufacturer's specifications before making any changes.