Backspacing measurements- S13 rear

[McCoy]

I thought this was worth sharing... friend had this tool laying around and let me borrow it last night. Basically it lets you see how much backspacing you actually have without trying on a bunch of different wheels.

I'll be looking at a bigger rear wheel down the road and want to go inward as much as possible... so this was of some interest to me.

The tool bolted up to the hub. this tools a little flimsy, so I did use a straight edge and a tape measure to verify the back spacing.


Set for a 17" wheel, It's crude but a few measurements verified it's about spot on.


At 7" of backspacing, here is where you start running into clearance issues. If you bump it up to an 18" wheel size, you can go up to about 7.5" of backspacing before you start running into issues on the LCA side.


The 7" backspacing measurement on the other side.

[Ronald So]

Very cool tool. Looks like the car got a replaced LCA.
New wheel hub ordered $140, thought my wholesale would have been better. The neo ht 800 wheel bearing grease is expensive. $40+10s/h.(hopefully this saves my hubs and gives me more than a season of use)

[McCoy]

Very cool tool. Looks like the car got a replaced LCA.

Actually the last owner went through and replaced all the LCA's (front and rear) when he was doing the suspension work... that was ok in my book

[KA240SX808]

I was thinking about picking this up " http://www.summitracing.com/parts/PHP-01201/ " but I figured I could calculate by watching other ppls set-up's. But I still might just to see how muc Wheel & Tire I can fit.

[2Fass240us]

Monty: I assume you just rotate the hub to rotate the tool? Neat idea, and very simple.

Do you plan to run different wheels/tires front to back?

[McCoy]

Andy - yep, works best with the car in neutral too. I plan to have a extra set of rear wheels that are wider. Now that I have the ability to datalog I might consider playing with a staggered setup later on just to see how much of a difference it can make.

[Matt93SE]

I was watching a hot rod show on Speed channel the other day, and they showed how to measure backspacing with a tape measure, plumb bob, and a stick basically.
pretty simple, but I can't describe how it went...

[Def]

Monty - one question... have you gone mudding with your S13 recently?

[McCoy]

The real question is... when was the last time I washed the car

[logr]

Monty, you might mention that is 7 in the rear and not the front. Hate for someone to buy 7 in backspacing for the front.

[McCoy]

Mike, I put that in the title, but yes you are right.

I didn't want to do the fronts as it varies by the coilovers you run and how much camber you have built in at the spindle.

[justinmc]

I was watching a hot rod show on Speed channel the other day, and they showed how to measure backspacing with a tape measure, plumb bob, and a stick basically.
pretty simple, but I can't describe how it went...

The tape measure and plumb bob works basically the same way.. this is a little easier to use. I have one of those that I loaned to my friend awhile back to measure his backspacing on an old chevy he was building. This reminds me to ask for it back.

[Your Mom]

thats awesome, but how do you figure out what wheel and offset will get the most out of this. like 17X11 +40. always thought that a 240 would look pretty cool if someone could fill the rears wells up. looking from behind, kinda like a drag car. don't think thats real practical thou.

[McCoy]

^^^ go here and click on the backspacing/offset calculator, punch in 17x11 +40 and it gives you the backspacing.

A 17x12 wheel with a 7" backspacing is equal to a +13mm offset, FWIW.

[Matt93SE]

The tape measure and plumb bob works basically the same way.. this is a little easier to use. I have one of those that I loaned to my friend awhile back to measure his backspacing on an old chevy he was building. This reminds me to ask for it back.

STFU, n00b. You don't know NUTHIN!!



You come here to finally get away from Al's SR sackriding?