Peaty's Holeshot Fast Flow Tubeless Valves - Mango Size:60mm This is also suggested by

This is also suggested by the K for "Key" in the product name

Rear Adjustable Velcro System

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Peaty's Holeshot Fast Flow Tubeless Valves - Mango Size:60mm This is also suggested byHoleshot Fast Flow Valves deliver approximately 200% greater airflow than our Mk2 Presta valve, while maintaining an air tight, fail safe design that reduces the risk of damage during use. Key Product Features 200% more FLOW than a MK2 Presta Valve No sealant clog Fully tyre insert compatible Fully serviceable with no throw away parts Internal and external anodising to reduce clog Air tight fail safe valve mechanism located inside the rim Micro