Originally Posted by markesc
Just an FYI, the 2006 GS 430 wheels do clear the TT brakes by 1mm at the closest point to the hub, and about 2-3mm on the face of the caliper...
10-year old post response warning.
(Post #605, coincidentally, also an Oregonian.)
I picked up a set of '95 LS400 front brake calipers, but as I read up on what's involved in the swap, I'm thinking I may have fitment issues. I have '98-02 17" GS430 wheels like these
. Most of the info I've been able to find is regarding putting LS400 / Supra TT brakes on a GS car
, which apparently requires a RCA spacer. Info on fitting GS wheels over said calipers on a SC is a different matter, since it's purely a question of wheel-caliper clearance.
That's a bit off-topic for this thread, but I was hoping someone could lend some insight into how to determine if my wheels will clear the calipers, short of doing a test install and seeing if they hit. Would I have to measure center-front edge depth of the caliper and compare that to the SC ones, and try to measure the closest point from the inside of the wheel to the caliper (lots of places to introduce small but significant measurement errors!), or is there a better way?
is the most conclusive answer I've found so far:
Q: Will you need spacers if you are running ls400 brakes with 17" gs wheels?
A: Yes. Even LS400 calipers will require spacers when using stock 17s.
I'm still not sure if that's referring to regular wheel spacers or the RCA spacers needed on GS cars, though. It's an unfortunate overlap in terminology.
I'd rather not add regular wheel spacers if I can avoid it, although it would look better than the high offset stockies. Two reasons: 1) so much disagreement on the safety of running spacers, and 2) I have a bad stud in the back that we haven't figured out how to remove yet with the pressed-on hub, and it would look funky to have spacers up front but not in back!
Edit 1: I eyeballed it while cleaning up the new calipers, and it may be as much as 1/4" to 1/2" too tight between the caliper and wheel. Probably too big of a discrepancy to be worth more detailed measuring, let alone a test mounting, unless someone knows otherwise.
Edit 2: I found a post in another thread saying that 67mm is needed between rotor and back of wheel, and mine is more like 45mm, so I need a full 1" spacer to have only minimal (3mm) clearance. Yikes.
Edit 3: I've run across that 67mm figure a few times now, but also a post saying it's a bit misleading because of differences in rotor face depth between the LS and SC. The actual depth needed to clear the calipers is more like 64mm. Also, my 45mm measurement may be a bit conservative, given where I measured at radially. There could be as much as 50mm there, meaning a 15-20mm space would suffice, rather than 25mm.