Hardest bit is fitting but read on.
Dead chuffed with this liner but fitting is difficult. After a couple of attempts I worked out the easiest way.
My tyres were big, schwalbe Balloon tyres.
The easiest way I found was remove the wheel, remove tyre and inner tube from the wheel. Blow up the inner tube. Fit it inside the loose tyre. Blow it up until the tube has applied pressure onto the tyre. Push the liner between the tube and tyre, trim to length when it's all in place. Check the liner is evenly positioned in the tyre behind the tube. Make sure the direction of the tyre is facing the correct way then fit the tyre onto the wheel as normal. I managed quite easily, hardly needed levers, only for the last tiny bit. It was very easy to do like this. Good luck.
Verified purchase: YesCondition: New