Considering buying a new fork and want to get the measurements right. The steerer tube length is from the top of the crown to the very top of the threads, right? And full length, you drop a straight line from the axle to the ground (assuming steerer is flat on the ground) and measure from that line to tip of steerer, right? And rake is distance from ground to actual axle? Am I missing anything? Pretty much all forks have 100 mm axle spacing, right? I'm trying to replace a rigid fork for an old mtb with 26" wheels.