What your looking for is an older 1 1/8th straight steer tube fork.I have an old school hard tail frame, 2011 Stumpjumper Comp I am thinking about building up. I like the look of the frame. It is NOS, in perfect condition, never been touched.
Here is a link to the specs on 99 Spokes. 2011 Stumpjumper Comp
The key to getting this built seems to be finding a fork. The head tube is different from what is being made now. It is 1 1/8" straight.
The factory built version had a RockShox Reba RLT, 90 mm. I would like to have a fork at least as good, preferably better. The spec sheet says 'tapered fork' but I think it means a tapered seat not a tapered steerer tube. I measured the bearing seats top and bottom, both are 1 1/8".
I would ride it on asphalt and hard packed trails with gravel tires. DT Swiss 240 hubs and 26" EX 471 wheels.
Any recommendations for a fork and how to determine if it will fit are greatly appreciated.
I like the older Marzocchi forks. They are very smooth and you can find them on fee bay. A good 90 or 100 mm fork will be fine for your frame.
Depending on your budget theres plenty of options out there. You may want to be careful of older elastomer forks, they tend to dry out and not have much in the way of travel or rebound control.