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On my 2015 Anthem with 120mm reba's & a mucky nuts mud guard.
I have noticed that under compresion (more going fast into a rise than getting air & heavy landing) the tyre rubs breifly on the mud guard. Obviously the attachment point in on the fork crown so surley the clearance should be constant?
My guess was the wheel deflecting, I noticed it first with the standard rims & its possibly slightly worse with my new WTB Kom's.
Could well be your tyre changing shape as you "land". The displaced air from the contact has to go somewhere.
How much clearance does your tyre / fork have?
Yeah its probably not a lot of clearance , its a Trail boss 2.25 but have had a TB 2.4 in previously. I suppose the rolling radius is the same though.
My concern was that perhaps its a spoke tension issue, as in not enough.