converting SUspension fork to rigid fork - details?

[d_douglas]

Hi all,

I am in process of ridding my son of the worn old suspension fork on his commuter bike to make it more commuter friendly and I need some help.

It is a 10+ yr old RockShox Reba or Judy that has leaks and work stanchions. I think the travel is either 80-100mm. I have locked it out so at least it isnt bouncing.

The frame is a 16" Norco hardtail (name escapes me, but its a decent alloy one about 10yrs old).

If I replace the fork with a rigid equivalent, how long should the A-C be? It is for conmmuting so I dont want it to be a sled. The frame takes a straight steerer and uses disc brakes only.

Am I looking at a 425-440mm rigid fork? One shop I called suggested a 460mm, but that sounds too tall for this purpose.

I guess secondly, does anyone have one for sale that is affordable?