I have 275/60 mickey thompson dr's in the back and 26x4.5 bias sportsman's up front AND no front sway bar. I don't have any instability issues and drive the car on the highway at 70mph, through the hills around me etc. With a front tire as skinny as this I don't think it really matters what the construction is as it's going to understeer for sure when you reach the limit of grip. I think you run into the issue of mixing bias and radials when the sizes are closer together or you put the bias on the rear of the car. I'd buy this combo again and as long as you remember you have maybe half the grip you used to at the front of the car you'll be fine.