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Valves & Cores
The bit that holds the air in. Easy to overlook until one starts weeping at 70mph. This category covers replacement stems, cores and caps in the usual configurations: straight rubber stems for steel rims, angled metal stems for cast wheels with awkward access, high-pressure cores for tubeless setups. Match the stem to your rim hole (most are 8.3mm or 11.5mm) and the angle to your disc clearance. Cores are largely universal. Caps stop grit getting where it shouldn't.
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