Tubes should only be inflated after being placed within the suitable wheel and tyre. Any tube inflated outside the tyre will only withhold a small fraction of the normal pressure. Pressure Guidelines are only applicable when placed within the tyre. We Accept and prefer PAYPAL, with immediate payment. You can reach our customer services on the "Contact Seller" button, if you have any problem making the immediate payment. We will always help you to have a 100% positive happy buying experience. Contact us if you are unhappy about any aspect of your purchase from us. We only want five star feedback from you so buy with confidence. We do accept returns on our items. Please contact us within 30 Days of delivery to notify of intent to return so we can discuss any problems and authorise the return.