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Tire sizes with anti lock brakes

3

37 chief

Well-known Member
The tire shop guy told me all the tires should be exactly the same with anti lock brakes. The reason for my question is, My front tires are about 5/8 inch taller than the rear dules on my dodge. Is this going to be a problem? Stan
 
should not matter cause it is by sencer one wheel start to slide it lt it lose if im right you only have one on the rear end it is on the ring gear you should be ok
 
I don't see why it would matter. ABS works on the principle that as sensor 'sees' the wheel lock, the brakes are then released and the cycle repeated. Tire size should not matter.

Rod
 
Actually in some systems a large difference in tire height can effect the function. What your tire guy was told is that his customers tire sizes must match. As in a P235-R15 mixed with a P205-15 can cause the antilock not to function properly.

However your tire guy is taking it to extremes and would really like to sell you 6 new tires for that dually.

In other words, you are just fine.
 
Yep in theory they should all be the same size but I'll bet after say 10,000 mile no 2 tires will be closer then say 1/8 inch. And yes ABS is good if all is working right but if not it is also trouble. The more they mess with things the more likely it is you will have problems
 
ABS will be less sensitive to mismatched tire sizes than an AWD or a computerized traction control system. Don't know if your truck has any of that. Those systems look at mismatches in wheel speed to determine where to direct power. Your manual or dealer should be able to tell you the maximum difference that the system can tolerate.
 
I ran the spare donut tire on the rear of my small GM car once for a couple hundred miles. The car has four wheel anti lock brakes.
 
It can create a problem, especially on smaller cars. We have seen new tires on one end and worn tires on the other end create loads of problems with antilock brakes. By putting on 2 more new tires the problems went away. I dont think we ever experienced much of a problem with trucks.
 
The sensor on your wheels pick up rpm of your tire and compare it to the speedometer, tire size has everything to do with it. If they dont match up the car thinks you are in a skid and will reduce braking power. Your computer can be reprogrammed for non stock tires. In some states this is a inspect able item. Ever try to work on rear brakes on a lift. If the computer doesn't sense your front tires turning the back brakes will not work until you override the system with 4 or 5 hard applications of the brakes
 
Tire guys are there to make money. They are not there for your benefit. Their aim is to get you to come back and sell you something else however they can. I saw two old ladies buying new tires because the manager told them if they need air more than once in 6 months, they should replace them. They looked like brand new with deep tread. They will get their someday.
 
What? how do you figure? The larger diameter tire has fewer Revolutions per mile, which translates into fewer RPM, whether its measured at the rim or at the hub.
 
Theoretically, at least, the sensors are going to assume that the front (larger)tires are locking under braking since they are producing fewer RPM at a given speed than your rears. But...dunno if it will have "real world" issues.
 
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