Repeated inner tube punctures. Continental & Halfords. Mavic & Araya rims.

Usually caused by the inner tube moving around the inside by the tyre under braking, also caused by a rough burr on the inside of the valve hole on the rim.

Check the valve hole on the rim for rough edges, if still happening some talc inside the tyre stops the tyre gripping the inner tube and dragging it round while braking.
This^^^^^^
 
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