Can i use 26er tires and rims on a gravel fork?
If you use a 26er frame, 26&quot; wheels and a 29er fork, the geometry will be awkward. It is possible to mount it, it will work, but the bike will be...
... well, I was wrong, it is the other way, it will be shorter in front. Gravel forks have axle to crown lengths aroun 400 mm (more than road bikes to accomodate larger tyres).
If I were you, I would be looking for a rigid 26er MTB fork. they are not rare. And quite often come.with straight steerers as required by the older MTB frames.
As @mattnz requests, such a rigid fork should be corrected for the fork travel the frame was designed to be used with. For example, this is a 26&quot; fork designed for frames used with forks with 100 mm travel (axle to crown 453 mm). https://surlybikes.com/parts/1x1_fork