And in case you were wondering, you're not worried about heat in that area.
Not only is it the coolest part of the exhaust, but it only gets really really hot back there at higher extended engine speeds. Idling around would not get it hot enough to do harm to the rubber tire even if it was almost touching.
And at that time, your tire is likely rolling anyway, making it impossible to overheat just one point on the tire.
As said then, you have plenty of clearance. Even for the heat.
And if I'm not mistaken, that's pretty darn close to where the factory had part of the pipe, albeit with an extra bend to the rear.
Paul