I know you all must be fed up with BOB questions so I'll try and make it snappy. I have the BOB with the 26"/700c no fenders fork. I currently use this with an MTB. I'm building a crosscheck that will have fatties n' fenders. If I put the 29er/700c & fenders fork on, should I not use this with my MTB? I mean should I change back to the smaller fork when I want to use the smaller wheel size? I know this is probably a dumb question. My apologies in advance.