Thanks for starting this, I was going to as well.
The duro crux 3.25 tire on my new Oracle 27.5 (Jan 2022) rubs against the frame, but it doesn’t take super hard pedaling, merely mounting, or slightly more pressure due to feeling close to losing balance causes it. (I’m a beginner moving up from a club 24, before I’m really ready to).
I am heavy, close to 240lbs/108kg, so that doesn’t help I am sure.
UDC support suggested I check the bearing caps hadn’t loosened).. I tightened them some, which helped slightly but they seemed tight (almost wonder if it’s maybe a hair too tight now- the wheel will free roll when propped upside down but slows to a stop faster than my other uni or bike wheels as if there is some slight resistance)
The spokes seem tight too, when plucked they make a “ding” sound as you would expect something under tension would instead of a “thud”
I can’t quite tell where the movement is other than seems near the hub, and i would guess it takes near 10lbs(4.5kg) pressure with my thumb on either side to push the rim far enough that the tire touches the frame.
There’s not much clearance between the tire and frame (about 2mm / ~1/8"), pics below…
I am thinking i need to reduce tire size to maybe 3.0 instead of 3.25 to avoid the rub.
I have very little time and distance of easy beginner riding on it.
It is annoying and disappointing because one of the reasons I upgraded was to have a stronger uni with stronger ISIS setup. (I thought these were “built to go big and shred hard”?)
Maybe it should come with a 3.0 tire stock? (The M4O’s do).
I hope that would provide enough extra clearance over stock to avoid the rubbing.
