Big Bore Kits for the 2025 Road Glide

5 verified-fit parts, each checked against the 2025 Road Glide specifically. Lowest price first.

• Fuel Moto128" Big Bore Kit - Gen 2 M8 (117")$1,199.95
• Fuel Moto132" Big Bore Kit - Gen 2 M8 (117")$1,499.95
• Zippers PerformanceZipper's M8 128" Cylinder Kit, -2.8cc Flat-Top Pistons⚠ Has fit notes · ⚠ Race/closed-course product$1,529.00
• Zippers PerformanceZipper's M8 128" Cylinder Kit, -6.12cc Dished Pistons⚠ Has fit notes · ⚠ Race/closed-course product$1,529.00
• Zippers PerformanceZipper's M8 128" Cylinder Kit, +1.9cc Domed Pistons⚠ Has fit notes · ⚠ Race/closed-course product$1,889.00