Used on rims with hole for Presta valve (hole diameter: 6.5 mm), the flat rubber base of the valve can guarantee a perfect air seal, without the need for additional adapters, or the conical adapter can serve; In the presence of rims with drilling lens but increased hole (diameter> 6.5 mm) inside the circle, or with Schrader drilling (8.5 mm hole diameter), we recommend the use of the conical rubber adapter, inserted on the valve before appearing in the circle. Given the great variety of circle profiles on the market, a flat or conical base can be preferable according to the case. With the Mariposa effect valves, the conical adapter allows you to switch from a conical plate in a moment. We have chosen an aluminum league for the valve body that bends before breaking, adding reliability.