agent325

I replaced my OEM wheel set up with 19" wheels (235 35 19 Front 295 30 19 Rears) a few weeks ago and my ABS and PSM light came on. Im I running incorrect tire configuration? Should I run 315 25 19s?

Imo000

You need to find out the tire diameter (get it from the tire manufacturer). Chances are good that the fronts and the rears are too far apart and this makes the ABS think there is something wrong with the wheel speed sensors.

C4CRNA

I had the ABS PSM light go on due to a bad MAF.
Did it come on immediately after the tire/wheel change?

agent325

I think it may be the brake light switch. Light does not come on till I apply the brakes. I drove for 12 miles without the light coming on, I soon as I hit the brakes, ABS PSM light popped on.

Sneaky Pete

I think your tires are not at fault. Looking at the discount tire calculator the diameters are very close to each other from front to rear.

Macster

That may not be good enough.

The approved wheel/tire combinations need to have their tire diameters calculated.

This sets the upper limit differences between the front and rear tires.

The lower limit would be a new pair of front times matched to a worn out (right at the wear bars) rear pair of rear tires, or vice versa.

If the time combination the OP is using falls outside of these numbers/ranges then the combination is not compatible with the car and its electronics hand holding.

Sneaky Pete

The voice of reason has spoken. I think the voice has some good input. Another reason not to go 19's.

Imo000

Don't go by a generic tire calculator. Find out exactly what the diameter is from the manufacturer. Even if it's the same size, different manufacturers will have different actual sizes.

Sneaky Pete

Well than ok...OP what make are your tires? I think we are splitting hairs here.

agent325

PS2s

Sneaky Pete

Looking at TR the diff from front to rear with the given sizes is .5". If the second size given for the rear was used the diff would be .3". We are talking an 1/8" from the rears between the two rear sizes and 3/8" to a 1/2" from front to rear. Do some math and figure out what the different is in %. It's too early for my for my brain wake up.

agent325

It was my brake switch - no more lights