All this systems give some amount of protection. However, a piece of glass that is big enough will make his way through any of the above protections. I propose you here a cheap and hopefully effective alternative. Of course this armouring increases rolling resistance and weight. However, these effects cannot be noticed in my 20 inches folding bicycle and I really don't care.
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- old tires, thinner than the tires to be protected,
- self-retracting tape measure;
- an old brake cable