My buddy put a 140mm Fox on his ID4. He loves it, even though he never comes anywhere close using all the travel. He broke a weld where the top tube joins the head tube, which was probably the fork's fault- too much leverage. I warned him about that but does he listen to me? Noooo. GT warranted the frame even though if they had refused I wouldn't have blamed them. Even though the long fork raises the front of bike way up high, he uses a riser bar. Even though he never gets his wheels more than 2 inches off the ground, he uses heavy duty FR wheels that weigh a ton. Even though he spent $600 for the fork, he dropped a total for $120 for the wheels (the clearance rack at Performance.) What does he use this frankenbike for? XC RACING! And the guy actually wins his division!