The SIP tubeless rims are equipped with separately attached, threaded pressure valves. In some countries the air pumps at petrol and service stations cannot be attached to our valve stubs due to their 25mm length. Our British friends are especially punished in this respect and have great difficulty getting air into their tyres at all when on tour. For this reason and more we now have this item available as a longer, 30mm part, if you are in need of this upgrade. As of now this improvement will be automatically included with our complete range of tubeless wheels. Conclusion: Easy to replace and be matched to international needs and required look.