Originally Posted by bruce19

They feel similar to me. The positions are exactly the same as far as I can tell. And, I am using Mavic Ksyrium Elite USTs on both. I have a 6.4 mi TT that I run about 2 x month and the Guru shows a slightly faster time and thus MPH. I try to do this TT when the wind is calm so I'm guessing conditions are fairly similar. I also assume that it is that top gearing that is the cause.