These thick inner tubes perform well on the city roads. The noise produced by these tyres is very low. Parameter of the inner tube is 90/65-6.5 and this model of tires id 11 inches in size. The inner tube is a must for the outer tyre. If the inner tube is not installed the tyre might deform when pumped with air. The inner tube is made with high density material which has chances to reduce flat tyres.