is it just the c5/c6 brake calipers with 13" rotors that work with 17" rims or can (C5/C6) Z51 caliper with a 13" rotor wk W/17" wheels too?

 

Don't know if this helps you, but I test fitted a stock Firebird 17inch wheel on my C6 Z51 and it clearanced just fine with some room to spare and no spacers.I plan on using MT DRs on them for the track.

 

C5/Base C6: Virtually all 17" Wheels.

C6 Z51: Barely fits under a select few 17" wheels. When I say barely, I mean less than a sheet of paper. So close, the owner didn't run them like this. It's a pretty safe bet that C6 Z51 will require an 18" wheel.

 

close to the spoke of the rim or close to the wall of the wheel?

 

In this case it was both. It was a ZR1 wheel (not sure it was a replica or GM wheel), but it was tucked into the corner of the wheel, really close to both the spokes and the barrel of the wheel.

The only way to know *for sure* is to get a Z51 pad bracket and try it (don't have to have a rotor). I personally don't think it's worth it to get the bigger Z51 rotor. AFAIK, there aren't any aftermarket ones out yet, so the only source is GM.

 

if i was to do a 13 rotor with ls1 calipers is there a after market bracket for the caliper to make up for the bigger rotor?

 

No one makes brackets to do a C5 13" rotor with stock LS1 calipers. But, you can do a complete C5 brake conversion, with C5 rotors, pad brackets, and calipers. Several vendors make brackets for said swap. This setup will fit under 17" wheels.

 

Actually, LG makes a bracket for this application, no cutting required. I just put this setup on my car and it works great, all stock F-body stuff and C5 rotors - made a big difference.

 

O rly? Thanks for the info, I hadn't heard about it.

 

do they make a brackets that bolt on a twelve bolt with an f-body setup?
do the ls1 calipers with a 13" rotor, with the right pads stop better than the c5 setup?