newf150kid

On a budget & when I bought my truck it had 2 245/70r16 in the front (new) and 2 245/75r16 in back (new but weather cracked) . Does this affect anything at all? My dad said something about the 4x4. Just wondering because I can find a lot of 245/75r16 again but I want to keep the front tires on because they're brand new.

BassAckwards

Keep the bigger tires in back. Don't actuate 4x4 on the pavement at all or even in any situation where you tires can get a good amount of grip.

When the rear tires wear out replace to match fronts

Tackle

There is almost an inch diameter difference between the two, doing the math. IRL there may be less or there may be more.

No it's not ideal, you can easily wreck your transfer case due to binding. As said, 4x4 only when the wheels can slip.

Carcrazygts2

It will also cause issues with ABS kicking in early under hard breaking because of the wheel speed difference being seen by the ABS control module.

Jefk

X2, but wouldn't it make more since for the front to wear out sooner since there smaller, and will spin more plus turning?

BassAckwards

Diameter will have very little difference as you'll notice all different size tires of the same model will come with the same warranty in general (Except different speed ratings, and LT vs P-Metric).

What will have a greater effect is the weight of the engine on those tires vs the much lighter rear end and his inability to rotate them.

He said his front tires are the newest though so it would make sense to replace the rears to match the front tires.

newf150kid

So... In conclusion should I try to match my front tires or is it ok to get 245/75? Don't think I'll be using much 4x4 on pavement except for minor offroading.

JCR 56

You can match either set, the main thing is on a 4x4 all the tires need to be the same size.

BassAckwards

Correct. If you want to stick with the taller 75 series tire just keep waiting until the 70 series wear out.

Red-Ford

Just go on craigslist and get a good set of 33's.