Back in 2009 the Soča Valley MTB guide was published in Slovenian and English version. All copied have been sold right away, but until now it still stand out as one of the most comprehensive source of MTB trails in the valley, from Kanal region all the way up until the steep hills of Julian Alps. Here are some interesting facts about the trails in the valley - PDF presentation.
1300m of altitude difference, 10km of ascent, 13% of average slope, with 20% steepness on the very beginning of ascent just outside Zatolmin - these are some facts that make this way up to Sleme not very popular among mountain bike riders to say the least. But there are some who like it just for these facts. The way up takes some effort but when you get to the top where the highest mountain pasture of Tolmins region lies the view opens to the Julian alps on the East and West side. From here many possibilities for descent are available. The most popular is to go down to Mederje and via Pretovč straight down to Zatolmin. The single track is always empty and it allows a very high speed descent with some rocky sections just to keep the thing interesting.