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Next, remove the 4 13mm nuts that hold the two rim halves together as shown below with the red arrows below. The rim halves may or may not have a tight grip on the tyre. If they do it is necessary to force the tire off the rim with a pair of screwdrivers. On this tyre I also replaced the tube as the old one had been patched a few times and this is a good time to change it . Also, sometimes the inner face of the rim can be rusted and sharp flakes can puncture the new tube. I always scrape down the inside face of the rims to be sure that my new tube will survive.

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Some tyres are directional and they must be installed to rotate in a certain way when installed on a scooter. On the Continental tyre, it depends whether the tyre is to be used on the rear or the front of the bike. There is a molded guide with arrows that must face in the direction of rotation. The easiest way to do this is to place it up against the bike in the way that it will be mounted. As far as I can tell this is more of an issue on a Vespa as the wheels are not reversible, but I believe a Lambretta's rims will go on correctly either way. See below for a close-up photo