I would love to know what the coolest and most efficient rims are. Forgiato makes one but OF FREAKING COURSE it's 20".Several real world testings show a difference of about 10 miles. I have taken it on a 1200 mile road trip a couple times a year and tried the aeros once. They didn't noticably change my trip time or charging. But there may be more efficient rims out there
Someone needs to make 18's cool again so the market accommodates it more.