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radial bearing featuring black-oxide treated 52100 High-Carbon Chromium alloy races paired with Grade 5 Silicon-Nitride Ceramic Balls with 90% fill
Possible reasons: Less butyl content
A stable ride - even with low air pressures
Rail: CroMo
Topeak Twinhead DX5 Variant:Topeak Pump Head Twinhead DX5 with hose insert & hose cap. For JB Sport III, Mountain X radial bearing featuring black-oxide treatedFor JoeBlow Sport III (without hose)
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