I have a DM/ SM honda hatchback (EF).
Well, wheels that are oem run 15x6 +50 offset.
I already have 15x7.5's in +40, 15x8's in +25, and 15x8's in +45.
I prefer the sets of 15x8's for 225/45/15 (for obvious reasons).
And I'm considering running a set of 245/50/15's for lapping days with these wheels as well.
Since I haven't fitted the 15x8's, I just did some quick math and it seems that to get the oem backspacing in the 15x8's, you need a +24 offset.
So in order to use the 15x8's that I have which are +45, I will need a 21mm spacer. I doubt they come in such an odd size, so 20mm or even 1" will do.
Now at what point do spacers become unsafe? I've seen two types - one where the spacer is JUST a spacer, and another type where the spacer bolts to the hub of the vehicle, then the wheel bolts to the spacer.
Of course I'll need some extended studs for the former spacer, and none for the latter.
This vehicle will also see some hpde's - mainly just lapping days.
*I should note that the +45 offset wheels I have are much lighter than the +25 ones... hence my desire to use a spacer.