Is a 150/90-15 rear tire too wide?

[Dickey]

I found a few posts where someone said in passing that they had such a tire on their gz250 but a question was asked and there was no follow up in the thread. I thought I would bring attention to the matter directly. I want a wide wall to go on my bike and from searching the only tire I found any real confirmation that worked was an AM42 140/90-15 Venom tire. Upon ordering said tire, I received a black wall 140/90-15 tire of the same make and it appears that they have run out of the white wall deals. Dunlop sells a white wall that is 150/90-15 but that puts the difference from stock at 1/2" instead of 1/4" and I was hoping to tap the experience here before placing an order to find out first hand if such a tire would fit, and if so, what kind of modification might be necessary if any.


edit - grammatical error