Calvin's Challenge is adding a century TT to the mix this year... 112 miles actually.

I would like to do this event, and likely will, but have a conflict in that it's exactly one week after I get back from a trip to GA for the ToG and my buddies and I do a lot of hard climbing over three days. I may have to back out of the trip if I want to do my best in the TT.

So... I am wondering if anybody knows about other century length TTs within driving distance of SW Ohio (500 mile-ish radius). There are other types of ultra-distance rides (longer distances, 12/24 hour challenges, etc.), but this particular length and the TT format appeals to me.