MICHELIN offers this tube size 2.75-18, 3.00-18, 80/100-18, 90/90-18. This tube will fit on many motocross and enduro wheels. It is a standard tube of excellent quality. Why is it more expensive than some competitors? Some competitors simply play on the thickness of the tube to save money which is not the case at MICHELIN. They are known and recognized for their quality of product which is still the case with this one.