I looked into this a lot when I first got my Volt, but I ended up just cramming it in the back on the rare occasions I do go biking. But I did compile a list of threads here. This one shows measurements and is a good indication that you shouldn't have issues scraping. I think the torklift one is better, but it's a shame it costs so much more. You might be able to sell it at the end of the lease, which could cut down on the cost overall?