Offset & Backspace - How Do They Relate? - TundraTalk.net - Toyota Tundra Discussion Forum
User Tag List

Reply
 
LinkBack Thread Tools
post #1 of 285 (permalink) Old 06-29-2010, 02:21 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Offset & Backspace - How Do They Relate?

Offset and backspace are essentially two different ways of looking at the same thing. They determine the location of the wheel and tire assembly when bolted to the vehicles hub. (how far in - tucked, or how far out they will sit)

Offset is the measured distance between the hub mounting surface and the wheels center line.
With X being the determined offset, the hub mounting surface on positive offset wheels is X amount forward from the wheel center line. The hub mounting surface on negative offset wheels is X amount backwards from the wheel center line. The hub mounting surface on 0 offset wheels is the wheel center line.
Backspacing is the measurement from the hub mounting surface to the back edge of the wheel.

***Typically speaking, the higher the offset/backspace, the more the wheel will tuck inwards towards the suspension or away from the fender. The lower the offset/backspace, the more the wheel will push out away from the suspension or towards the fender.
For Example:

*If the offset on a 9" wide wheel is +12mm, the hub mounting surface will be 12mm forward from the wheels center line. Measuring from the hub mounting surface to the back edge of the wheel, the backspacing is 5.5"

*If the offset on a 9" wide wheel is -12mm, the hub mounting surface would be 12mm towards the back of the wheel from the wheels center line. Measuring from the hub mounting surface to the back edge of the wheel, the backspacing is 4.5"

Here's how to calculate the backspacing using the rim width and offset:

First - add 1" to the rim width and then divide by 2 to find the wheels center line (you have to account for the wheel flange which is why you add 1" to the rim width) . Second - convert the offset which is in millimeters into inches. There is 25.4mm in 1 inch so divide the offset by 25.4. Lastly - add the converted offset to the wheels center line if the offset is positive for the correct backspacing. Subtract the converted offset to the wheels center line if the offset is negative for the correct backspacing.
For Example:

17x9 +12mm offset

*9" rim width + 1" = 10"
*10"/2 = 5" (wheels center line)
*+12mm offset/25.4 = 0.47" (0.50" rounded up)
*0.50" + 5" = 5.50" Backspace


17x9 -12mm offset

*9" rim width + 1" = 10"
*10"/2 = 5" (wheels center line)
*-12mm offset/25.4 = 0.47" (0.50" rounded up)
*0.50" - 5" = 4.50" Backspace

***Please note that the wheels center line is the backspacing for 0 offset wheels.


I hope this helps.

-Matt

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by Discount Tire; 01-25-2012 at 11:32 AM.
Discount Tire is offline  
The Following 28 Users Say Thank You to Discount Tire For This Useful Post:
$h@ki (04-09-2012), AZ_Drifter (11-20-2013), BlackTundra52 (02-22-2013), coldheat06 (06-26-2012), Craynial (01-20-2017), cueto (01-21-2014), Dixon Cider (04-03-2016), EUPHOR1C (05-14-2012), gingertundra (02-11-2014), Highlandorr (10-16-2012), Jesco (06-29-2010), Jptundra (04-28-2014), Kalaikanui (12-14-2013), mchooch (05-11-2013), Mr. Creosote (02-26-2012), NIE_Cal (01-23-2014), Nocturnaltundra (07-05-2014), Noe drink a lot 711 (11-12-2013), Off_Axis (03-07-2013), PitbullTRD (03-11-2016), rb87 (01-04-2016), re.ac.tor (06-10-2012), RJP12TT (08-14-2012), tomz2ndtoy (06-07-2014), Tundra guy #9 (10-12-2014), Viz Nice (12-14-2010), vjorgem (02-21-2013), Walkfuu (06-29-2010)
Sponsored Links
Advertisement
 
post #2 of 285 (permalink) Old 06-29-2010, 02:28 PM
Administrator
Premium Member
 
Jesco's Avatar
 
Join Date: May 2008
Location: The Gunshine State
Posts: 49,931
Thanks: 13,412
Thanked 45,168 Times in 20,709 Posts
Mentioned: 533 Post(s)
Tagged: 5 Thread(s)
Quoted: 5455 Post(s)
Good info. I'll stick it
Jesco is offline  
The Following 3 Users Say Thank You to Jesco For This Useful Post:
Discount Tire (06-29-2010), Mr. Creosote (02-26-2012), RJP12TT (08-14-2012)
post #3 of 285 (permalink) Old 06-29-2010, 04:46 PM
Senior Member
 
Join Date: Feb 2010
Location: Quantico, VA
Posts: 406
Thanks: 13
Thanked 55 Times in 48 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm probably thinking about this too hard, but I just wanted to try and get something straight in my head, because honestly, I've had questions about how to figure this stuff out.

If I have a positive offset (say +15 millimeters), then the wheel will be CLOSER to the suspension than a zero offset wheel and look "sucked in." And if I have a negative offset (-15 millimeters), then the wheel will be FARTHER from the suspension, and look like it's sticking out, correct?

Nothing special. Yet...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


2008 Black Double Cab, 5.7L, 4*4, SR5, bed liner and step rails

Black Tundra Club Member #19
smmiller506 is offline  
The Following 3 Users Say Thank You to smmiller506 For This Useful Post:
Mr. Creosote (02-26-2012), RJP12TT (08-14-2012), Seminole (02-26-2013)
 
post #4 of 285 (permalink) Old 06-29-2010, 05:02 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Quote:
Originally Posted by smmiller506 View Post
I'm probably thinking about this too hard, but I just wanted to try and get something straight in my head, because honestly, I've had questions about how to figure this stuff out.

If I have a positive offset (say +15 millimeters), then the wheel will be CLOSER to the suspension than a zero offset wheel and look "sucked in." And if I have a negative offset (-15 millimeters), then the wheel will be FARTHER from the suspension, and look like it's sticking out, correct?
It all depends on the rim width but typically speaking, yes.

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
The Following 3 Users Say Thank You to Discount Tire For This Useful Post:
Mr. Creosote (02-26-2012), Purplecat (07-23-2013), RJP12TT (08-14-2012)
post #5 of 285 (permalink) Old 06-29-2010, 05:10 PM
Senior Member
 
Join Date: Feb 2010
Location: Quantico, VA
Posts: 406
Thanks: 13
Thanked 55 Times in 48 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Discount Tire View Post
It all depends on the rim width but typically speaking, yes.
Ok, thanks!

Nothing special. Yet...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


2008 Black Double Cab, 5.7L, 4*4, SR5, bed liner and step rails

Black Tundra Club Member #19
smmiller506 is offline  
The Following User Says Thank You to smmiller506 For This Useful Post:
Mr. Creosote (02-26-2012)
post #6 of 285 (permalink) Old 06-29-2010, 05:15 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Now also keep in mind that a +15 offset on let's say a 9" wide wheel for example, will not looked sucked in on every vehicle especially the Tundra. Every vehicle has different offset ranges depending on the look wanted or suspension set-up.

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
The Following User Says Thank You to Discount Tire For This Useful Post:
Mr. Creosote (02-26-2012)
post #7 of 285 (permalink) Old 06-29-2010, 05:59 PM
Senior Member
 
Join Date: Feb 2010
Location: Quantico, VA
Posts: 406
Thanks: 13
Thanked 55 Times in 48 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Discount Tire View Post
Now also keep in mind that a +15 offset on let's say a 9" wide wheel for example, will not looked sucked in on every vehicle especially the Tundra. Every vehicle has different offset ranges depending on the look wanted or suspension set-up.
Oh, I understand that. I only said that to help get a picture of it in my head.

Nothing special. Yet...
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


2008 Black Double Cab, 5.7L, 4*4, SR5, bed liner and step rails

Black Tundra Club Member #19
smmiller506 is offline  
The Following User Says Thank You to smmiller506 For This Useful Post:
Mr. Creosote (02-26-2012)
post #8 of 285 (permalink) Old 01-23-2012, 10:28 PM
Junior Member
 
Join Date: Jan 2012
Posts: 10
Thanks: 2
Thanked 8 Times in 5 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
discount tire....can i install raceline rampage 20x9" +30 w/a 305-55-20 0r 305-50-20 with out any serious rubbing .......i have a 2'' coilover already installed in front .....looks like it would get purty close to the upper control arm.....but maybe not. yer thoughts ?

thanks for any input....
fuzzypickle is offline  
The Following User Says Thank You to fuzzypickle For This Useful Post:
Mr. Creosote (02-26-2012)
post #9 of 285 (permalink) Old 01-24-2012, 01:06 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Quote:
Originally Posted by fuzzypickle View Post
discount tire....can i install raceline rampage 20x9" +30 w/a 305-55-20 0r 305-50-20 with out any serious rubbing .......i have a 2'' coilover already installed in front .....looks like it would get purty close to the upper control arm.....but maybe not. yer thoughts ?

thanks for any input....
What year Tundra do you have?

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
The Following User Says Thank You to Discount Tire For This Useful Post:
Mr. Creosote (02-26-2012)
post #10 of 285 (permalink) Old 01-24-2012, 07:36 PM
Junior Member
 
Join Date: Jan 2012
Posts: 10
Thanks: 2
Thanked 8 Times in 5 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
year tundra

2008.......
fuzzypickle is offline  
The Following User Says Thank You to fuzzypickle For This Useful Post:
Mr. Creosote (02-26-2012)
post #11 of 285 (permalink) Old 01-25-2012, 11:35 AM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Yes, you should be fine with either tire size.

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
The Following User Says Thank You to Discount Tire For This Useful Post:
Mr. Creosote (02-26-2012)
post #12 of 285 (permalink) Old 02-26-2012, 10:57 PM
Junior Member
 
Join Date: Aug 2010
Posts: 4
Thanks: 0
Thanked 4 Times in 4 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Garage
So when a lift kit manufacture recomends backspacing, are they saying min or max? For example when they say a 305/55R20 will fit on a 20x9 w/ 6" bs, will a wheel with 5.5 or less still be okay? Thanks.
Hannafoj is offline  
The Following User Says Thank You to Hannafoj For This Useful Post:
Mr. Creosote (02-26-2012)
post #13 of 285 (permalink) Old 02-27-2012, 06:11 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Quote:
Originally Posted by Hannafoj View Post
So when a lift kit manufacture recomends backspacing, are they saying min or max? For example when they say a 305/55R20 will fit on a 20x9 w/ 6" bs, will a wheel with 5.5 or less still be okay? Thanks.
Lift kit manufacturers usually state a max backspace (highest backspace recommended).

If the lift kit manufacturer states a 305/55R20 will fit with a 20x9 with a 6" backspace, a wheel with any less BS will also work. A lower backspace will move the wheel and tire assembly out, away from the suspension and frame.

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
The Following User Says Thank You to Discount Tire For This Useful Post:
Grundletaint (10-13-2014)
post #14 of 285 (permalink) Old 04-08-2012, 12:25 PM
Senior Member
 
TundraAlaska's Avatar
 
Join Date: Apr 2012
Location: Alaska
Posts: 141
Thanks: 6
Thanked 113 Times in 76 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Have a question for discount tire as well. I have a 2010 stock height double cab. Would it do any running at all with a set of cranks at 0 offset with 275/60/20 tires? Been trying to figure this out for a while now. Thanks


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2014 Toyota Tundra Crewmax TSS XSP
Nav, Black Leather, Weathertech Mats, 20inch Wheels, 33inch BFG KO Tires, Fiberglass bed cover, bed liner, K&N Air Intake, Dual Exhaust, Aftermarket Running Boards.
"If you can't run with the big dogs..Stay on the Porch."
TundraAlaska is offline  
post #15 of 285 (permalink) Old 04-09-2012, 05:05 PM Thread Starter
Supporting Vendor
 
Discount Tire's Avatar
 
Join Date: May 2008
Posts: 1,777
Thanks: 589
Thanked 663 Times in 452 Posts
Mentioned: 22 Post(s)
Tagged: 1 Thread(s)
Quoted: 103 Post(s)
(Thread Starter)
Quote:
Originally Posted by TundraAlaska View Post
Have a question for discount tire as well. I have a 2010 stock height double cab. Would it do any running at all with a set of cranks at 0 offset with 275/60/20 tires? Been trying to figure this out for a while now. Thanks
It shouldn't. You'd run into issues if you decide to go with a larger tire in the future though. (without a lift that is.)

Low Prices! More Choices! Trusted Experts!
At The Store:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To Your Door:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Sales and Technical: 1.888.459.4080


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Useful Links:

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

  • To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Discount Tire is offline  
Sponsored Links
Advertisement
 
Reply

  TundraTalk.net - Toyota Tundra Discussion Forum > Tundra Discussion > Tundra Wheels & Tires

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the TundraTalk.net - Toyota Tundra Discussion Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome