Fun idea, but I don't know how I would time the "fuse".
I DO have an idea for the material: a solid rubber tire -- if we could come up with a way to slice it into a long thin ribbon. That way it would look like a real tire when lightly glued back together. Butcher shop meat slicer? I do have such a tire around here somewhere.
Now.... A new idea.... How do we create a small amount of fire when a bike begins moving? Just enough fire to light a string of firecrackers.
I think I know, but I'm keeping it to myself.
(And I have a way to contain the moop while allowing combustion pressure to escape.) Have a couple of bricks of firecrackers also, around here somewhere.
Does anyone know how much of a fireball would result if a disposable cigarette lighter ("Bic"?) were to go off, all at once? Can they be deliberately drained to near empty and still work reliably?
My new shop is almost finished, and it is fireproof, outside and inside.