I have stock 17" rims and tires (245/70R17) on my ram and want to put the 20" rims and tires (275/60R20) that most of the new dodges come with.
However,i was on a tire calculator website and they said anything bigger than a 3% difference can cause brake failure! Is this ture???And the difference between the two are like 8%.
Also, i was told that these wouldn't rub can anyone second that?
Thanks...

 

im not sayin it cant cause brake failure but my 2gen dodge has 38.5 boggers an its fine not 1 single prob out the brakes!!!!!

 

I don't think that a difference that small would cause "failure", that is really pushing the theory, but, they brakes may wear faster. I would think that the larger the contact area of your tires to the ground the better braking you will have, so my guess is that you will stop faster at the expense of replacing your brakes sooner. Bottom line, don't let your brakes dictate your tire/wheel size, unless you are thinking Monster Truck tires.

 

your brakes will be fine... its more weight but nothing too extreme

 

If You Have Rear Discs Your Really Have Nothing To Worry About. My Jeep Grand CherokeeHad 37's With Rear Drums And It Was ok With The Tires + Extra Weight.

But To Be "In Spec" It Will Affect Braking No Matter How Small The Tire Increase Is. But The Difference Your Talkin' About... That Really Is No Sweat.

 

yea what he said go for it....

 

cool thanks for the reply guys. Any one know about the tires rubbing though?

 

Unless dodge puts different brakes on trucks without the 20" rims, I would imagine the brakes would do just as good as on trucks that came with the 20's. Along the same line unless Dodge put different suspension on trucks without the 20" rims, then there should be no problem with it bottoming out.

 

yeah thats what i was thinking but i thought it could be possible for the 4th gen rams. (the most common ones to have the 20's)

 

Although brake issues can happen when going with larger wheels/tires in this case you will be just fine.

The people on here with 37"+ tires and heavy *** wheels though, they could run into issues. That is a lot of extra rotational mass for factory brakes to keep up with. I doubt the brakes will fail completely but there is no way they will stop you as well as the proper sized wheel and tire combo.