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.
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.

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