ABS / tire size question:

94-302-vert · Sep 26, 2005

Will my ABS freak out if I run a 245/40/17 in front and 275/40/17 in the back?

I need to replace a rear sensor and I also need tires but I hate to do both jsut to waste $$ on one or the other. I know I can't run a different height on both front tires without a problem.

Also if anyone knows what the thread is that holds the rear sensors I would greatly appreciate it... Mine disappeared since it was not holding on the sensor for the last few thousand miles or so...

Thanks!

kck6894 · Sep 26, 2005

you ABS will not work if you don't have the same size tire on all 4 coners (height). You need to go to a 275/35/17 in the back and it will be ok

CManT1914 · Sep 26, 2005

I've never heard of taller tires effecting ABS. Mine came with 225/55/16's stock, and now I have 255/45/17's up front, and 315/35/17's out back. I have no issues. I don't know what size those holes are though, sorry.

kck6894 · Sep 26, 2005

Height isn't the problem, height differance it what creates the problem. As long as they are the same Left to right and front to rear there isn't a problem. But he's talking about putting a tire on the back that's 1" taller than the front. The ABS computer will see the rear sensors moving at a different speed than the front.

hotrodnut · Sep 26, 2005

Different height tires on front and rear will effect the ABS but as a general rule of thumb as long as the diameters are within 3% of each other it will be okay. So your selection should work fine.

Pops Fun · Sep 26, 2005

Hi

I have ABS problems when I go to my DR's, they are 325/50/15 (27.8"dia.). There is about a 2" difference between my front and back tires on that setup.

http://www.miata.net/garage/tirecalc.html

When I use my 295/50/15 (26.6") I have no problem.. on the front are 215/65/15 (26") so look at the diameter difference between the front and back tires you are using.

hotrodnut · Sep 26, 2005

hotrodnut said:
Different height tires on front and rear will effect the ABS but as a general rule of thumb as long as the diameters are within 3% of each other it will be okay. So your selection should work fine.

Woops, I see the 245/40 now, so that is more than 3% so you could have a problem, sorry, I read the 245/40 as 245/45 at first . . .

94-302-vert · Sep 26, 2005

DOH... now I need to weigh having ABS vs having the stance I love...

Thanks for the input guys... Although on second thought when I bought the car it had 225/70/16's in front and the 225/50/16's in back. Same side/side.

Isn't thsi more than the difference I am proposing and the ABS worked then. But the bigger tires were in front rather than the rear...

95COBRA241 · Sep 26, 2005

kck6894 said:
Height isn't the problem, height differance it what creates the problem. As long as they are the same Left to right and front to rear there isn't a problem. But he's talking about putting a tire on the back that's 1" taller than the front. The ABS computer will see the rear sensors moving at a different speed than the front.

That's good info to know cause I never realized it made a difference considering the different tire combos ppl run front to rear.

ABS / tire size question:

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