did you get this from Arlen Ness? I’ve been contemplating doing this for my sport glide

 

yes its the arlen ness. Packade says: 15" dyna models. But disc and caliperadapter fits perfect.

 

Excuse my ignorance but does this improve braking? Or is this upgrade cosmetic?

 

It improves braking.

 

The larger the rotor the better the breaking, fortunately, because a cosmetic update I wouldn't call that myself, not on this type of bike, sorry this is my opinion.

 

Is the usage of bigger rotor okay if you have ABS, or does it mess with its system? (since the braking power changes). I couldnt find a clear answer for this. I would like to have more braking power too, but I am scared what would it do in case of emergency brake+messed up ABS

 

You could ask your dealer to be 100% sure, but it should not. The ABS sensor detects slippage and essentially "pulses" the brakes when slippage occurs to allow maximum brake force without locking the wheel up, so this should not affect it in any way. However, not a bad idea to simply ask your service department, if you are unsure.

 

Isn't the sensor in the bearing, If so it shouldn't affect it....

 

On my fxbr (I had the rear off to put a chrome pulley cover on) the sensor slips on the axle beside the caliper mount.

 

Posta be 50° and sunny in Ohio Sunday! Yay!
Take the Breakout for a haircut, then the King in to town for a shot of gas. Fingers crossed!