Wheel Offset: Please check my math

I often have a hard time wrapping my head around wheel offset problems, so I need your help with this.

The back of my car currently has 9.5 inch wide (241.3mm) rims with a 45mm offset.

I have another set that are 10 inch wide (254mm) with a 58mm offset.

So ideally, would a 6.35mm spacer put the center of the 10 inch wheel in the same place as that of the 9.5? Or would it need to be 12.7mm?

Here you go: https://www.1010tires.com/Tools/Wheel-Offset-Calculator

You know what they say - build a man a fire, he'll be warm for a night. Set a man on fire, he'll be warm the rest of his life. Or something like that.

...or is it as simple as subtracting 45 from 58?

In reply to Keith Tanner:

Thanks Keith!

Will they fit?

Seriously the best offset and tire calculator

Once again, it looks like I'm overthinking things. I spent too much time thinking about wheel width, when I should have just focused on wheel center line. Looks like a pair of H&R Trak+ 14mm spacers and some expensive bolts should get me to where I want to be.

Next step: Get the TPMS system turned off.

Jumper K. Balls wrote: Will they fit? Seriously the best offset and tire calculator

The link seems to be broken. The calculator I like is this one:

http://www.rimsntires.com/specspro.jsp

It has a nice visual representation of the two wheel + tire sizes you put in to compare, so it's really obvious what changing one number does.

codrus wrote: The calculator I like is this one: http://www.rimsntires.com/specspro.jsp It has a nice visual representation of the two wheel + tire sizes you put in to compare, so it's really obvious what changing one number does.

Wow, that is a seriously useful tool right there. Bookmarked. Thank you!

Best thing iv found so far. Im looking to get new wheels for my FC but its low and I don't know what my offset is 100% on my current setup plus im running spacers so there is lots of questions. Don't want to buy another set off craigslist and find out they don't fit.