Just got a pair of tubular Vittoria Rally road tyres. They look perfect but the problem is that the valve is 42mm which is no good for my new awesome 50mm rims. Above all the valve core is not removable so the extenders I've got with them are useless.
The question is if there's any mean to extend the valves up to 60-80mm in this situation or should I return it back to the shop?
Thank you in advance for your advised.