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IS42 headset bearing: Size 30.5x41.8x8 mm 45x45 degree for integrated headsets compatible with Cane Creek IS42, compatible with FSA models to fit common road and mtb frames for straightforward replacement. Sealed stainless steel construction: Angular contact design supports steering loads and keeps grease inside while rubber seals block dust and moisture for steady function in city commutes trail rides and training. Smooth steering performance: Precision 45x45 race angles and matched tracks help reduce play and friction for accurate handling and quiet turning across climbs descents corners and daily riding conditions. Easy fit dimensions: 30.5 mm inner 41.8 mm outer 8 mm thickness confirm quickly with calipers and replace worn bearings in integrated cups without extra facing saving time for home mechanics or shop service. Wide application scenarios: Works for road bikes gravel bikes and mtb for commuting fitness errands and weekend tours and serves as a practical spare for home maintenance bike workshops and travel repair kits.