I am looking to change my fork because of some issue(broken). My problem is my headtube is the standard ec34, which is why I can't use tapered fork. So, I am looking at some mtb rigid fork, which have straight steer tube, but I am not sure whether it will work, and the sizing. A 29er fork has axle to crown distance about 430mm, but as far as I measure my former fork the axle to crown distance is only around 375-380mm. A 40mm difference, and it doesn't include the crown to steer tube distance.