When you pull your wheels for travel, your frame’s dropouts are left exposed — and vulnerable. Our Dropout Protectors inserts directly into your fork and rear triangle to prevent the dropouts from being squeezed, crushed, or misaligned during flying or shipping. Designed for modern thru-axle standards, it fits: Front: 12mm or 15mm thru-axles 100mm (road/gravel) 110mm Boost (MTB) Rear: 12mm thru-axles 142mm 148mm Boost Precision-printed from PETG-CF (carbon fiber reinforced PETG) , it delivers the ideal balance of strength, stiffness, and slight compliance — tough enough to resist compression, forgiving enough to protect your frame. Simple. Lightweight. Built for travel. Because the weakest link in your bike case shouldn’t be your dropouts.