Niner says the max tire clearance for 2015 RLT Steel running 650b/27.5 is 47mm. I have 47s on now, but It seems like there is still plenty of room to go bigger in the rear. The fork wont take anything bigger. Anybody have experience swapping out the fork with something new like the Bearclaw Ramhorn Gravel+ to go up to something like 27.5 x2.2 in front and rear?