They ar a lot larger than the size says. the 2.7 i will not fit many frames. I here people say they got bad reviews ? I have been using the 2.5's for 2 years and I love them. I have them set up Tubless, on Syncros rims. and run 25# of air. I am on my 3rd set and have a set for back ups. I use them for DH and Freeriding on a Hardtail. Flex? I aint feeling it, but I do feel that they are very grippy. as far as a trials tire, you would be best to skip this one.