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The Classic External Cup EC Threadless Headset is the reliable workhorse of the Ritchey threadless headset range. Now available with our timeless high-polish finish, this smooth and reliable specimen features lightweight, precision-machined aluminum cups, sealed cartridge 45/45-degree bearings, and comes packed with Ritchey Grease. A sealed design promises minimal penetration from the elements. The Classic Threadless Headset adds that classy and reliable detail your bike deserves. Headset Type: Threadless. Stack height: 32mm, upper: 18mm, lower: 14mm. Headtube ID: 34mm. EC34/28.6 (1 ⅛”) bearing: 41.8/30.15/8mm 45°/45° - sealed cartridge (ACB), EC34/30 (1 ⅛”) bearing: 44/30.5/8mm 45°/45° - sealed cartridge (ACB).