I have a OneTen 29 with 100mm fork. Works for me for the moment. If you're not that aggressive it will probably be OK for you. On some of the very steep stuff (Top of Contermans Black route for example) you do have to get your weight right back, but everything still rideable. Also debated this issue on this thread, and the feedback was that the 100 would be OK. Not ideal, but OK. I was looking to save some cash on my build, so wanted to transfer existing fork, but if cash is not a problem I'd suggest a 120mm minimum.One advantage of 100mm fork is that they're normally quite a bit lighter than longer travel forks, especially longer than 120mm. Long and short, 100mm will work, but I suspect that the bike will really come alive with 120mm - 140mm.
