Namibian and 5 times DD 2-man hubber here:
Obviously, the condition of the gravel road changes from time to time over 400 km. However, for the most part, it is well conditioned and fast rolling gravel roads. So much so that I absolutely preach gravel bikes for anyone that is young, tough or well-conditioned to off-road riding (not because that terrain is tough, but bigger or unfit persons sometimes prefer the plush from dual sus).
Think of it this way, your average speed will not reduce due to bouncy or challenging terrain, it will reduce due to climbing or longer stops. This is especially true of the first half, where you can achieve speeds up to 40 km/h easily. In the second half, you will encounter portions of thick sand and sandy rivers which you need to cross. Thin tires might let you down here. Still, I would not suggest a mountain bike do do these sections. A gravel bike or hard tail with 47C's will get you through it comfortably. If you can fit 2.1 inch low rolling resistance tires on your gravel bike, you are perfectly set up for this race.
Yes, towards the end there will be much more thick sand as you leave the last checkpoint; and just before you come into Swakpomund there are sections that represent rock gardens. Still, I've always gotten through these areas with a gravel bike without losing a position or worse. You just have to concentrate, and go with the flow of the bike.
My answer above applies to anyone who wants to attempt this race semi competitively. If you just want to finish, then bring your full sus mtb and foldable camping chair.
Also note: dust from supporting cars passing by often ruins riders' lungs or eyes; so bring protective glasses for night riding and a buff to filter out the dust. Also, remember we are high and dry here, so train heat and train dehydration!
Regards, Konrad
