Your bike, you can do almost anything you want to, including telling the dealer to go to hell.

 

Do it. No worries.

 

If your front and rear tire don't match tread and brand you may be riding along and suddenly loose control and veer off the road and die.

Or at lest that's what some people say. Even motorcycle tire manufacturers say such things. I have never followed this advice. I would switch brands by replacing the tires as they wear out. One brand in front and one in the rear. I would pay close attention to the handling when riding mismatched tires and never noticed the slightest handling issues. I've been riding cycles for about 40 years and never had an issue with mismatched tires.

 

You can run that configuring but I wouldn't recommend it.
IMO stock Dunlops are about the worst tire you can put on a bike!!!!!!!!!!!
They slipped on every tar snake and road paint that I've ever ridden them on.
I decided a few years ago that I would never ride a bike with stock Dunlop tires on it again.

That said I'm a huge fan of Dunlops Elite series tires!!!!!!!!!!!!!!!!!!!

In other words instead of just changing the front tire change them both.

 

The only thing I remember being told is not to mix bias and radial. Don't know if that's good advice or bunk. Looks to me like the AE is a bias tire.

Some D407s (rear tire) are radial.

What year is your bike?

 

I'm currently running a AE on the front and stock on the rear.(front stock cupped badly) No problem. On my 16 RGS I ran a stock on front and AE on rear( flat on stock rear). No problem. Tire change is a good time to put a angled valve stem on. I recommend " Curvy Girl" valve stems.

 

Don't mix. IMHO. Tires are tires. They are made out of rubber. They wear out. We will always be replacing them. I am not of the school that if you mix brands that your bike will spin off into an alternate universe.

 

I wasn't talking about mixing brands, I was talking about mixing type - bias v radial

 

Yeah. That was what I said. I was agreeing with you. Chill.