Just recalling a conversation I had with them when I was trying to measure the spacing to buy the correct thru axles lengths. They told me a certain size and I was measuring something different for the frame. Their response was "....because titanium has certain elasticity". I ordered the sizes they told me and they fit perfectly....so yeah I guess it does have flex. Is that a bad thing? We're talking 1-3 mm. Maybe that's a problem if you are racing and concerned it will eat up precious wattage but seems to me like it adds a lot of comfort, which is more important for the type of riding I do.