Knucklehead Crankcase Shirt


Hold onto this one knuckleheads. This shirt is crafted from a comfy cotton blend fabric and features a pre-war Harley-Davidson knucklehead crankcase diagram. Whether you’re hitting the road, or working on the bike, our crankcase shirt will be a go-to option in your closet. Get yours today while they last!

The design is printed in breathable orange ink and the shirt is made from a 60/40 cotton blend fabric. It is also available on a black shirt. It comes in sizes small – extra large* and features a pre-war Harley crankcase diagram that we’ve adapted for print.

*This shirt has a fitted style. If you like a looser fit, or are between sizes, size up.



This design’s inspiration started from a vintage 1940s motorcycle repair manual that was found by a friend in an abandoned house. It’s a neat book: “Modern Motorcycle Mechanics and Speed Tuning” by J.B. Nicholson. Ours is a second edition.

Additional information


XS, S, M, L, XL