So I've read through a few different threads on spacers, but I don't quite see what I was looking for.

My question revolves around using spacers: Are you ever able to leave the stock lugs in place? For example, would a 15mm spacer still let you run everything else? Or does one always need to knock them out and replace with longer studs?

I'm just looking to add some spacers to stock rims to make it a little more flush.

 

You'll definitely need extended studs for 15mm, or even 10mm. It's a safety issue as you want the lug nuts to be fully threaded. FWIW, I run 15mm front and 20mm in the rear and have extended studs all around.

 

15mm and 20mm is what I see the most often. What size studs? Do you have a part number? Or do they usually come with the spacers?

 

Check out Z1, they list what they recommend for extended length studs based on the spacer size.

 

Perfect!

Out of curiosity I also see bolt-in versions of hubs, are those safe?