Please fill the product with air below 0.35 bar/5 psi to ensure initial defects before use. Please be aware that after installation is not covered under the warranty. Although this product has excellent heat resistance, please use a pumping brake or drive with care when you plan to use a long brake on a bike with rim brakes (for example, long downhills). Also, please lower the air pressure before using in advance if heat is expected to increase air pressure. Do not add air pressure exceeding 0.35 bar/5 psi while not attached to the tire. There is a risk of bursting. Tube seams are strong, but depending on individual items, it may take some time (several days) to inflate. Even if it is not inflated it will not affect your ride. When using a portable electric pump, please use it via a hose. Heat generated may cause the valve to deform and break.