I have a 00 Si. My friend has a 05 LX sedan. I have a set of 15x6.5 wheels that fit perfectly on my 00 Si. My friend tried these wheels on his car and said they didn't fit. He mentioned something about the hub on his car being a different size.... Both cars are 4 lugs and are stock as far as hubs go.

Should my 15x6.5 wheels fit his 05 Civic?

 

Both cars are 4x100.

However, the hub bore of your car is 56.1mm and the hub bore of his car is 64.1mm.

Thus, the centers of each wheel would have to be bored out to fit the bigger hub.

If it were vice versa, you could run hubcentric rings.

 

I don't know where you got your information, but that's false. They're both 56.1mm hub bores. The IT-R and CT-R have 64.1mm hub bores, as well as some Accords.

When your friend tried the wheels on, did he check for clearance to the brake caliper?