Yes the probe is 26. Sitting with 2.125 wide butterfly tread like an old bmx. Its probably the fat tire that makes this thing such an effortless roll. The crosscut is out but scouring still. I was hoping I would have been in the clear with it but missed my opportunity. Job interview Monday... If the bike can make it till my first check I am eyeballing a 1993 deore DX drive train on fleabay lol