The manual calls for using 14 rubber bands which are included in the kit. The last 2 rubber bands are crossed over to help keep the others on. This redundancy of 7 bands per side offers good strength and stability so I usually do a visual check for cracked or dried out rubber bands when I put them on. If they are marginal, they usually break when you try to apply them. Sometimes they last for a few weeks or a few months depending on the storage conditions and weather conditions. When not in use, I keep the rubber bands in a sealed plastic bag.

My guess for the top speed of the ElectirStar might be 40-50mph.