There is a KML file on the SufiTrails website which if you convert looks like this
560.1 mi, +119717 ft. Starts in Gaziosmanpaşa, Marmara Bölgesi
ridewithgps.com
There are issue with this conversion as :
a) it has a walking section from Istanbul to Yelova. Sufi Trails recommend the Istanbul - Yelova ferry instead. If you check the PilgrimstoJerusalem
website you will see that walking out of Istanbul is very difficult as it is criss-crossed by main roads. The ferry to Yelova would avoid this.
b) Lots of the gps data is missing which means you only get parts of elevation profile. If I can find better data, I will update it
The website has a warning about solo travellers (male or female) on certain sections such as the Karacalar – Kemerkaya section.
Sufi Trail is a long distance hiking and cycling route from Istanbul to Konya. Since Roman, Ottoman and Medevile times this was the road to Mekka and Jerusalem.
sufitrail.com
I don't know how recent the information is but there are reports of government action in this area from 2001 which suggest it may not be totally within government control. Page 36
Personally can't see a reason
not to do this route but it may be better in numbers or with a tour group.