Wheels

[NNMan]

I am looking for some alloys.

A few thinks I would like to know is what is back spacing? and will it cause mush harm to have a bigger center bore which means all the weigh is on the bolts?

 

[Terranosaurus]

Back spacing is some invented term for what id really referred to as offset. Offset is the measure in millimeters of the difference betwen the centre line of the wheel (measured from inside rim to inside rim) and the mounting face of the wheel.

It is usually referred to as ET?? ie vauxhall wheels are ET49, they are offset by 49mm, a negative figure denotes that the hub face is inboard of the centre of the wheel so the wheel will tend to stick out moor (or deep dish in old money).
Theres more on wiki HRE

Reducing the offset can have the effect of shortening the life of bushes and ball joints and will also cause tyre wear through upsetting the ackerman geometry - much the same as fitting wheel spacers.

Not sure that the nissans 'spigot' mount anyway on the hubs, will have to check my hubs to see, but if they do its best to maintain it, though 6 hefty 12mm studs should do the job ok, just be extra careful settling the wheel onto the studs and nuts.

 

[NNMan]

This is what I thought about back spacing untill I have seen back spacing and offset given for wheels and some have the same offset but different back spacing.

Could it be back space is a measurement from the back of the rim to the mounting face, and offset is measured from the center of the wheel to the mounting plate, so that wheels of different width (eg 15x8 and 15x10) could have the same back spacing but different offset.

 

[Terranosaurus]

That would certainly be the case, I've just never sen a wheel manufacturer that quotes backspace.