Wheel spacer question
Wheel spacer question
Hi all,
I am looking to add some stance go my Blazer. I have stock wheels and 30x9.5 nexen roadian Mt. What width wheel spacers should I put on the front and back?
Thank you
I am looking to add some stance go my Blazer. I have stock wheels and 30x9.5 nexen roadian Mt. What width wheel spacers should I put on the front and back?
Thank you
Moderator
Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
"Track" on the front tires is wider than the rear tires for stability reasons, (holds true on most vehicles). Best not to fool with it at all, but, if you must, do it equally to each wheel, front and rear.
BF Veteran
Joined: Jan 2008
Posts: 2,748
From: Southern, Alberta
Why does my front axle have a wider trac than the rear? - Ford Truck Enthusiasts Forums
Ackerman steering is the concept behind the wider front track. Less oversteer, and better handling.The term "Slip angle" becomes far more important when considering larger tires of a 4wd.
Make a turn at speed with equal width axles, and the vehicle will try to lose traction to the rear tires (oversteer). This is compounded by a tire that is larger and has a greater amount of sidewall flex. Making the front axle wider helps to maintian additional control.
Weight capacities are also a contributing factor.
Contrary to popular belief, it is not so the rear tires can obtain a different line of traction that the front.
The small amount of difference puts the tires in roughly the same track. Most vehicles differ ony an inch or so on each side. Not enough to put the rear tires in anything fresh.
Notice heavier capacity vehicles have a greater width in the front than the rear. Compare a dana 60 front and a dana 44 front from the same era truck. Notice which one has a greater capacity and which of the two is wider.
This is different than a 2wd truck where drive tires and steer tires are a different dimension. These tend to push more than a 4wd.
4wd trucks typically require the same size tires in the front than the rear.
This makes Ackerman steering quite critical.
Quote:
So do people need to take "slip angle" and Aackerman steering geometry into consideration when choosing wheel off sets or tire size or have the Ford engineers already taken care of it and built the suspension that way?
Oh no, you leave it the way that it is. You do not want to change wheel offsets from front to rear on a 4wd truck, unless you intend to change the Ackerman angle.
Doing so will have a negative affect on Ackerman angle, and then you wont be able to rotate tires.
This angle is accounted for and engineered into your vehicle already.
Changes like wheelbase will also have an affect, as well as really tall tires that have soft sidewalls. This is where the slip angle comes into play.
Your front axle is wider for a good reason, though some feel that it looks odd.
Notice many off road race vehicle, and see how much this width difference is. Even in 2wd trucks. This is a fairly stable platform. Too much and the steering gets too fast, but keep it reasonable, and the truck can feel fairly swift while maintaing control.
Make a turn at speed with equal width axles, and the vehicle will try to lose traction to the rear tires (oversteer). This is compounded by a tire that is larger and has a greater amount of sidewall flex. Making the front axle wider helps to maintian additional control.
Weight capacities are also a contributing factor.
Contrary to popular belief, it is not so the rear tires can obtain a different line of traction that the front.
The small amount of difference puts the tires in roughly the same track. Most vehicles differ ony an inch or so on each side. Not enough to put the rear tires in anything fresh.
Notice heavier capacity vehicles have a greater width in the front than the rear. Compare a dana 60 front and a dana 44 front from the same era truck. Notice which one has a greater capacity and which of the two is wider.
This is different than a 2wd truck where drive tires and steer tires are a different dimension. These tend to push more than a 4wd.
4wd trucks typically require the same size tires in the front than the rear.
This makes Ackerman steering quite critical.
Quote:
So do people need to take "slip angle" and Aackerman steering geometry into consideration when choosing wheel off sets or tire size or have the Ford engineers already taken care of it and built the suspension that way?
Oh no, you leave it the way that it is. You do not want to change wheel offsets from front to rear on a 4wd truck, unless you intend to change the Ackerman angle.
Doing so will have a negative affect on Ackerman angle, and then you wont be able to rotate tires.
This angle is accounted for and engineered into your vehicle already.
Changes like wheelbase will also have an affect, as well as really tall tires that have soft sidewalls. This is where the slip angle comes into play.
Your front axle is wider for a good reason, though some feel that it looks odd.
Notice many off road race vehicle, and see how much this width difference is. Even in 2wd trucks. This is a fairly stable platform. Too much and the steering gets too fast, but keep it reasonable, and the truck can feel fairly swift while maintaing control.
Last edited by El_Beautor; Jan 28, 2016 at 07:09 PM.
Senior Member
Joined: Mar 2015
Posts: 811
From: waterford, mich.
Increasing the distance from the bearing to the wheel mounting surface multiplies the force applied to the bearing causing them to wear out faster. Something to listen for when using wheel spacers.
Moderator
Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
Good point Rusty!
The quote pretty much nails it, track is not a good thing to mess with. It's not like a cold air intake system that looks good and doesn't DO anything. Messing with track changes the look, and adversely affects handling, while at the same time, causing other costly issues.
The quote pretty much nails it, track is not a good thing to mess with. It's not like a cold air intake system that looks good and doesn't DO anything. Messing with track changes the look, and adversely affects handling, while at the same time, causing other costly issues.
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