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That will depend on the final Gear Ratio. Using a Shaft Drive with a 90 degree wheel drive there will be a variety of Gear Ratios and if you go for off the line, using the much larger wheels but lighter it should top anywhere between a Hundred and Two. Any good highway ratio, shaft, chain, or belt drive will result either in one monster front wheel kisser to it just gliding off the line, it all depends on the set up. If I wanted it multipurpose I would go with a Chain drive, it is simpler and much faster to change the rear tire already mounted on another rim with the proper rear sprocket and if you do that, the longer or shorter chain is in your tool box, ready to go get in the wind.
I think the weight on the Elio is about 1250 lbs. A stripped hard tail would be maybe about 1/3 of that even with the engine. BUT the engine itself is only 55 hp (about 1 litre displacement). Would be interesting to run the ratios. The top speed on the Elio is about 107 mph. A high end CanAm (3 wheeler) with a 1330 Rotax puts out about 115 hp. It will run over 186 mph without the governor and the CanAm weighing in at 850 lbs. dry. The Polaris engine they use in their 'Slingshot' 3 wheeler is about 173 hp by comparisons and a stock unit will top out around 130 mph tugging a much larger weight of 1700 lbs.
I don't know if Elio has even cleared their final proto engine through engineering yet but it's not going to be a speedster from what I've seen. Just a stock little inline 3 banger.
No question that a few short minutes of wind on a bike brings unwinding.
Something our spirit seems to long. Works for me anyway. And most who do so.