Measuring track width help needed

[bananahamuck]

So im looking up track width for 411 (not sss) and the numbers seem to be 1240mm (48.8") for front and 1130mm (44.5") for rear these # may not be exact ...my question is, does 4 inch difference front to back sound right?or in the ballpark? i am just accumulating parts right now.. and i could go out and remove all four wheels and measure myself but have 1 other Datsun project in and 1 waiting to go in garage right now any help (getting my head straight) would be appreciated...

[philcas1987]

So... What's in the works?

[bananahamuck]

maybe AE86 rear axle ya get disc brakes and if measurements work out track width in back is 8 1/2" wider than stock but only 4 inches wider than front ,, 0 offset in rear 1+ offset in front makes about 2 1/4" difference maybe big ass bubble flairs, but i aint cut OR scammed neighbor kid out his car/ ditch witch YET,,.ALSO,,, it may or may not include turtles..

[jfbrink]

Hi,

 

I'm pretty sure the track is the same between the standard 411 sedan and the SSS.

 

In any event, the numbers I have for the track on a '66 PL411 are 47.5" F and 47.2" R.

 

This is according to the factory service manual, among other sources.

 

The stock steel wheels are very dished, like a modern FWD car: offset is +40mm.

 

Jesse.

[bananahamuck]

Hmmm, that is not what i wanted to hear ,,i thought that 4 inches was alot but thought the measurements couldn`t be that far off but i guess it`s a good reason to actually get off my butt and measure the dang thing myself ....THANKS i appreciate your help .................also if anybody has conflicting info for or against .. PLEASE POST

[ppeters914]

Before starting my disc brake conversion, with the wheels off, I measured approximately 45-inches from backing plate to backing plate on both front & rear on my '66 WPL411. Looked like an additional 2-1/2-inches from the backing plate to the flange face on the rear axle.

 

HTH

 

Pete

[Rjawm]

Don't make the mistake I did when looking for info while swapping rear ends. I kept looking at track widths via the internet and not taking into consideration the offset of the wheels has an effect on the track width measurement. In short don't confuse track width for a mounting surface to mounting surface measurement. I will always remember to get the real measurement myself from making that rookie mistake, lol.

[ppeters914]

Don't make the mistake I did when looking for info while swapping rear ends. I kept looking at track widths via the internet and not taking into consideration the offset of the wheels has an effect on the track width measurement. In short don't confuse track width for a mounting surface to mounting surface measurement. I will always remember to get the real measurement myself from making that rookie mistake, lol.

I don't understand your warning. Can you explain further?

 

Pete

[Rjawm]

The track width measurement is from the middle of the tire tread (effectively the center of the rim), so unless the wheel offset is zero (placing the mounting surface of the rim in the center of the wheel) the offset can have an effect of narrowing the measurement, and on rare occasion widening it. When trying to keep good fitment on the car the rear is going under this can be a problem that leads to having to find really odd offsets to compensate. An example would be a mounting surface width of 54" when used with +40 offset / 7" wide wheel would have a track width of 50.86" due to the center of each wheel moving inboard by 1.57". If I had any skills in a paint program I would make a diagram to clarify.

 

Plus, when using other peoples measurements found on the internet there can be unforeseen variances due to some people not really understanding how to get the 'right' measurement. I guess the bottomline to what I'm trying to say is that the mounting surface to mounting surface width is more important to match for ease of use and that nothing beats getting the measurement yourself.

[ppeters914]

Ahhhhhhh.....now I get it. Appreciate the explanation.

 

Pete