Big Fat Pig Threadless Headset

This headset is designed for frames with a 49mm head tube inner diameter and requires a 1.5-inch steerer tube. It is a threadless design, so please verify your frame's head tube specifications before purchasing.

The lower cup is forged chromoly steel to handle the high-impact forces and stress common in aggressive trail riding, while the upper cup uses 6061 aluminum to save weight where structural reinforcement is less critical.

This model uses oversized ball bearings—1/4 inch in the lower cup and 5/32 inch in the upper—which are specifically chosen to increase load capacity and durability under heavy stress compared to standard, smaller bearings.

At 250 grams, this is a robust component built for strength and longevity rather than weight savings. It is best suited for riders who prioritize durability and handling stability on technical terrain over a lightweight build.

The stack height is 29.6 mm. This measurement is important because it dictates how much steerer tube length you need; if you are replacing an existing headset, ensure your current fork steerer has enough length to accommodate this stack height plus your stem.