Emil Lindgren of Rabobank and 8th at the world XC last year has posted this:
"Woke up this morning feeling that the schedualed 4*4 rowing was not going to happen. The mtb course behind the house is ready to rock and so am I.
I decided to give it a go on the bike instead. 4 times 2 laps on both 26 and 29 bike.
I have been riding both bikes whole winter and I can swap bike without feeling discomfort.
Below are a few numbers:
26 bike with tubular tires
No scientific results but it shows something.
My feeling is that the 29 has great traction both up, down and cornering. The 26 is easier to handle over jumps and tight corners.
I will continue my testing and give you more numbers along the journey.
For you wondering which bike I will use, I say both but guess mostly 26."
Interesting to see that tubs make so much difference!
I'll be riding the same course at the weekend so I can throw up some times to compare and "normal fit" rider to a pro over the same course.