I'm building up a Motobecane Fantom29 frame.The original bike is sold with a Dart3 29 (502mm axle to crown).I have 2 rigid forks- one Soul Cycles (485mm a to c) and one Zion 26er that can fit a 29er wheel (457 A to c). I want to use the Zion because it color matches the frame. The bike will be used on mild trails with WTB Exi wolf or Schwalbe big apple tires, 175mm cranks and platform pedals and no Cane Creek S3 plus5 headset. Can I get away with using the shorter fork? Or will it steepen the head tube angle too much?