What is the offset/backspacing of my KMC Thunder 20s???

[Slick]

Hey guys I need some quick help. I don't know the offset or backspacing on my KMC Thunder 20s and need to find out for potential buyers....Any help would be greatly appreciated!!! Thanks

 

[Blee1099]

measure it.

 

[Slick]

enlighten me on how to do that

 

[Blee1099]

Grab a flat piece of metal or a level that covers the entire length of the rim, measure from where the mounting surface to the where the underside of the metal/level.. That is your backspacing.

 

[Slick]

and how would I figure out the offset?

 

[Charlie's_93EB]

and how would I figure out the offset?

bump

 

[JDraper]

To calculate offset you'll need the following measurements:

Wheel backspace
Wheel Width
Wheel Center line (outboard flange to inboard flange measurement / 2)

Subtract:

Wheel center line from Wheel backspace to get offset.
If backspace is less than the wheel centerline the offset is negative
If backspace is greater than the wheel centerline the offset is positive



BTW, the chart below is offset in mm

 

[Charlie's_93EB]

ok, here is what is am thinking of,

it is just a regular black steelie, but i am thinking of going 4" BS not 3.75". Will this work well with the inch wider rim? Or should i stick with the 3.75?
Plan on 32 X10.5's.

And thanks for the info JD.



CRR-3975812 $36.95
Estimated Ship Date: Today
Application Suggested Parts Show All

Brand: Cragar
Product Line: Cragar Black Soft 8 Wheels
Rim Diameter (in): 15
Rim Width (in): 8.00
Backspacing (in): 4.00
Beadlock Functional: No
Beadlock Included: No
Rim Material: Steel
Center Material: Steel
Wheel Finish: Black
Lug Nut Seat Style: Conical seat
Wheel Construction: 2-piece
Conical Seat Taper: 60 degree
Hub Centric: No
Center Bore Diameter (in): 3.33
Center Cap Included: No
Offset (mm): -12
Valve Stems Included: No
Quantity: Sold individually.

Wheel, Black Soft 8, 15 in. x 8 in., 5 x 4.5 in. Bolt Circle, 4 in. Backspace, Each

 

[Charlie's_93EB]

ok after much research i how found out that 4" BS WILL TAKE THE RIM IN TO THE TRUCK 1/4" more the the stock rim right?

which could result in more rubbing.

USW-84-5812 $41.88
Estimated Ship Date: 1/1/06
Application Suggested Parts Show All

Brand: U.S. Wheel
Product Line: U.S. Wheel 84 Series Black Daytona Wheels
Rim Diameter (in): 15
Rim Width (in): 8.00
Backspacing (in): 3.75
Beadlock Functional: No
Beadlock Included: No
Rim Material: Steel
Center Material: Steel
Wheel Finish: Black
Lug Nut Seat Style: Conical seat
Wheel Construction: 2-piece
Conical Seat Taper: 60 degree
Hub Centric: No
Center Bore Diameter (in): 3.30
Center Cap Included: No
Offset (mm): -19
Valve Stems Included: No
Quantity: Sold individually.

Wheel, Black Daytona, 15 in. x 8 in., 5 x 4.5 in. Bolt Circle, 3 3/4 in. Backspace, Each

Check to make sure this part fits your application

 

[tgertz77]

4" BS on a 8" wide wheel will set you .5" further into the wheel well.

Your widening your wheel one inch, but only setting it out .5".