https://all4bikes.be/shop/images/kcnc/headsetradiant.jpg
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1 1/8 inch, AL 6061 crown race/cup.
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Bearing dimension: O.D. 41mm.
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Angular contact 45°, Height 6.5mm.
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Upper&Lower bearing cup insertion: 44mm.
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Fully Stainless Steel balls bearing OR 6/4 Titanium-DLC finished with ceramic ball bearing.
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Weight: S/S bearing- 65g(without cap and bolt), Ceramic bearing- 50g(without cap and bolt)