Check the listing for details. Specialized Allez Headset Bearings. Condition: New. Listed at 36.83 USD. This blueseal Bike Bearing kit contains‚ the upper and lower headset bearings needed to replace your Specialized Allez tapered 1 1/8 - 1 3/8"‚ headset bearings. Compatible up to 2021. blueseal Bike Bearings™ use top-quality LLU 2RS close-contact rubber seals. The tighter the seal is to the inner bearing race, the harder it is for water and dirt to get in — and the harder it is for grease to escape. Standard bearings contain around 20% generic grease, offering limited resistance against rain, corrosion, and dirt ingress. blueseal Bike Bearings™ contain the maximum possible fill of premium Mobil waterproof grease without compromising seal function. Most non-bike-specific bearings are ABEC 1. blueseal Bike Bearings™ are ABEC 3 rated, providing smoother running and longer lifespan. MAX full co.