AC3344 Headset Bearing – 33 x 44 x 6mm, 36/45° Chamfer. Why Choose the AC3344 Headset Bearing?. Headset Chamfer : 36° / 45°. This size is frequently found on Trek Slash (enduro models). Gravel bikes or certainhybrid bikes that use a sturdier headset for increased durability.
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