Wheel backspacing?
 

I am looking at these 17x7 5x114.3 wheels. How much back spacing is recomended ?

Please search more:

http://fc3spro.com/TECH/MODS/RT/rims.htm
https://www.rx7club.com/suspension-wheels-tires-brakes-20/official-fc-wheel-fitment-thread-257700/
etc...

Problem is I don't know what the offset is on these wheels is they came off an Rx8, looks like a negative offset but can't be sure from the pics. I'm not much of a wheels guy so the term offset is new to me.

http://en.wikipedia.org/wiki/Offset_%28wheel%29

http://www.1010tires.com/WheelOffsetCalculator.asp

you need to go measure the offset(or have the seller measure it) and you can use the calculator to work out if they will fit or atleast have a closer more informed guess.

Thanks those links helped a ton!!!!!!!!

I did end up buying those rims posted in the pic above. They are 17x7's I plan on either 225/50/R17 or 225/45/R17's does anybody think I will have and issue with wheel rubbing. I'm planing on putting a set of coilovers on to.

No one will be able to tell you for sure unless you give the offset of the wheels. The best I can tell you is 'probably'.

why would you want such skinny wheels?

they are also probably +35-40 range so i would say 215 45 all around and you should be ok with coilovers but its going to have a super awesome battleship look

https://www.rx7club.com/suspension-wheels-tires-brakes-20/fc-wheel-fitment-guide-see-here-before-posting-fitment-thread-950447/

Yeah working on the offset its cold as balls out. So I have to walk a ways to my apt garage to take meaurements. Actually I'm doing a 4x114 to 5x114 lug swap, so these wheels will look ton's better when all done.

Probably because he has an s4 base model (under his profile) and those are a huge upgrade over 14" phone dial stockers. NA's don't need more than 205 of tread anyways.

To the OP: the stock T2 offset on 7" stock rims is +42. Anything lower than that +30-40 will work just fine. If you are concerned with going "mad flush yo" then you would want +20-25 range at the least aggressive.

^^^ So do you think the 225's will buldge alot on the 17x7's ?

Nvm I think I am gonna go with 205's cuz I read that 225's barley fit 7 inch wide wheels.