(Image credit: Will Jones) The Traka is Europe's biggest gravel race, and it’s arguably on a par with Unbound in terms of its stature, despite being many years junior to the Kansas epic. The races are separated by only a few weeks in the calendar, so trends we can glean in Girona will in many cases grow by the time they hit Emporia. Having spent the best part of three days in and around The Traka – soaking in the 360, 200 and chatting to Maddy Nutt about her Traka 560 exploits –I’ve got a pretty good handle on what is going on in the gravel scene. Article continues below (Image credit: Will Jones) If you're not running MTB tyres it's not game over, but it's getting that way Of the eight all new machines on show, 100% of them had capacity for tyres measured in inches not millimetres.…