Hey guys,
I am a noob to cars, modding, and the FT86 scene. I recently got my first car (86) and have always wanted to have my own car with a set of gold rims, so I'm starting to mod my 86 gradually. I am a casual daily driver - no track, nothing intense, and also have to deal with heavy snow in the winter
I currently have a set of 57CRs 18x9.5 +38 sitting at home. My friend will be selling me his used BC BR coilovers soon. From asking and looking around, I learned that I need to get a new set of tires and lower my car for the rims' 9.5 width. I have settled for lowering 20mm/0.78 inches – 25.4mm/1 inch with the winter weather in mind.
I have no idea where to go from here:
Do I look at how much I lower my car first then get the appropriate tire size? Or do I get the right tire size then adjust the coils accordingly?
I also don’t have a go-to person or spot / garage for these yet so I’ve come to this forum

I'm hoping when I do go somewhere for installations, they'll know the right specs to go for.
Can you guys give me some insight to:
- what size tires work (235/30-40, 245/30-40);
- how low I should go (3/4 inch, 20 mm, not sure which unit to use because people go back and forth);
- advantages and disadvantages of larger / smaller tires (rubbing or offset clearance issues with wider tires);
- what camber to go with them;
- etc.?
Thanks!