How do you measure backspace??

[boggo]

Now this may sound like a stupid question,but how do I measure the backspace required for new rims on my defender?? She's currently got the stock steel rims it came with,and I'm looking to put some 16x8's on and run some 35's and have been told I need to get the backspace right or they could rub.Any help would be appreciated

[HSV Rangie]

back space:


the distance from the back of the wheel to the wheel mounting surface.


Michael.

[boggo]

Cheers,that seems too easy.There was talk of defenders discs being off centre(?!?),sometimes by quite a bit,and of the distance varying from either side of the vehicle.So really,I would need to measure from the inside of the disc to the shock or spring mount(or chassis rail),and the outside of the disc to the wheel arch in order to calculate the backspace required??Or am I just making this harder than it needs to be?

[HSV Rangie]

Std RR classic and disco 1 wheels.
16*7
have 130 mm back space.
Michael.

[Bush65]

Cheers,that seems too easy.There was talk of defenders discs being off centre(?!?),sometimes by quite a bit,and of the distance varying from either side of the vehicle.So really,I would need to measure from the inside of the disc to the shock or spring mount(or chassis rail),and the outside of the disc to the wheel arch in order to calculate the backspace required??Or am I just making this harder than it needs to be?

You method will not help to determine how much backspace to use to prevent larger dia tyres rubbing on the radius arms at full lock.

You need to be aware of the legalities of increasing the vehicle track. And tyres extending beyond the bodywork.

[mattD110td5x]

Now this may sound like a stupid question,but how do I measure the backspace required for new rims on my defender?? She's currently got the stock steel rims it came with,and I'm looking to put some 16x8's on and run some 35's and have been told I need to get the backspace right or they could rub.Any help would be appreciated

There is quite a bit of infromation on the D90 site about 35"
http://www.d-90.com/forum/index.php?

Also have a look at a diagram on backspace here

While we are talking about legals... The D130 does have lower
backspace rims to give a turning circle like a ferry as opposed to a
tanker. As I suppose it is a defender so you could argue that it
is OK to at least go as far as the D130 backspace, I don't know if
that is far enough for what you are planning.

ttfn,
Matthew