How would this affect any performance/operation/safety of the brakes in general? 5x112 to 4x108
 

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those 2 seem pretty close together... i think it'd be fine in the short term, but u
 

may discover that you'll replace rotors waaaay more often. I'd also be weary of sudden shock energy imposed through the rotor/hat, as well as over-stress situations (i.e. autoX). For the piece of mind it offers, I'd sooner find 2pc rotors &amp; have a 4x108 hat custom machined; then again that is the pilot-side of me talkin...

just my $0.02

checky yah later

Something's wrong. 5x112 and 4x108 cannot share the same pattern....
 

without one hole from both patterns instersecting if bolt holes are 14mm diameter or larger.

2nd

"The Devil" Has those on his coupe...
 

they are the rotors that are sold witht he wilwood brake set. I think RPI special drills them, they should be fine.

It would work...
 

RPI's big brake 4/108 kits are redrilled from 5x112 rotors. You would just have 8 holes.

That looks right for a 4x108 to 5x112 redrill, sort of, hard to tell...
 

though that bottom hole should be a bit oval. The one hole that is shared for 4x108 and 5x112 gets an ovalized shape, BTDT. Running ECS Tru-Float redrilled to 4x108 on the 90q20vt.

Cheers,

My CNC mill cannot do a bolt pattern with 5x112/4x108 using a 14mm end mill...
 

(required size) without blowing thru one of the other holes. And its tolerances are within 50 millionths! Nor will it show that template on screen without one hole being "ovaled" (bad) or "figure-8'td" (better).

And you certainly cant obtain "center" with an 8 hole pattern based on either as they dont share a common, or even very similar diameter. That would make for an eccentric pattern that would rotate on an entirely different center axis for each pattern.

I dont know how everyone else is accomplishing it.

that is PERFECTLY fine....seriously...

Like I said the set I have has one ovalized hole, 5x112 drilled with 4x108