HEIDENAU tube for tire 3.50/4.00-8", for tire 3.50/4.00-8", valve 70° When changing tyres, you should make sure that you order a new inner tube at the same time. This prevents any unpleasant surprises and you should always play it safe. We have various manufacturers and sizes from 8 "to 16". They are also available with different valve angles. Many tire manufacturers do not recommend the use of 10 '' inner tubes in combination with larger tires. These restrictions may limit the use of inner tubes of this size on some scooters. On the other hand, here at SIP Scootershop we have been using all these inner tubes that we have ever supplied in combination with tire sizes up to 130 / 90-10 for over twenty five years, with absolutely no problem! We can especially recommend the use of our SIP SIP tire inner tubes! These items are not only great value for money, but also in high quality! We have been very careful in the design and positioning of the valve, guaranteeing them perfection for both assembly and filling. Also included are our SIP pneumatic valves and plugs! SIP-TIP: "Tubeless" tires can also be used with a tube without any problem!