390mm R35 GT-R Brakes Inside an 18” Wheel
How to do it without flattening the soul?
When you're building wheels for real drivers—not posers—brake clearance isn’t a footnote. It’s the whole damn blueprint. Especially when you're trying to tuck R35 GT-R Brembos (380mm or 390mm) behind an 18" face and still keep your spokes concave and correct. Most builders throw in the towel we sharpened our pencils and went deeper.
Start With the Brakes. Build Everything Around Them.
Our process? Scan first. Engineer second.
We scanned the full brake setup in 3D—caliper body, rotor hat, every sharp edge—then designed our wheel around it. From the very first CAD line, this wheel was engineered to clear massive GT-R stoppers with surgical precision.—not just rough caliper shapes, but the exact rotor sweep, caliper lugs, bleeder profiles, and bolt spacing. Why? Because everything had to clear without sacrificing one millimetre of LMGT1 authenticity.
The Hard Numbers: 436mm and 446mm
Here’s where it gets serious:
- To clear a 380mm R35 kit, you need 436mm of inner barrel clearance, measured from the wheel mounting pad.
- To clear a 390mm kit, you need 446mm.
- That leaves you with a ~3mm buffer. Just enough air gap to breathe, not enough to BS your way through bad design.
Most 18" wheels—especially multi-piece ones—can’t touch that. They either dome the face, flatten the spokes, or bump up to 19s and call it a day, we didn’t settle.
Monoblock-Level Clearance. Multi-Piece Soul.
That kind of inner diameter is normally reserved for one-piece forged motorsport wheels, stuff like:
- RAYS TE37
- BBS E88
- Motegi Forged MR408s
Those wheels are built with race spec in mind. All about function. What we did was take that kind of monoblock clearance and bake it into a 3-piece forged wheel that looks like it belongs on a ‘90s JTCC pit lane.
We completely reworked the backside geometry:
- Deep reliefs behind the spokes
- Thinned hub pad without compromising strength
- Recessed valve seat to squeeze every mm of space
- Custom forged barrels matched with lips and brake clearance math that barely makes sense
From the outside? Pure LMGT1 energy.
From the inside? A scalpel engineered to clear Godzilla's brakes.
Why It Hits Different
This isn’t a rep wheel trying to fake heritage.
This is a full re-engineering of an icon—for real fitment, real brakes, and real builds.
You get:
- Proper 18" fitment for 380mm and 390mm GT-R brakes
- 446mm of legit clearance in a 2-piece forged format
- No compromise on concavity, spoke shape, or lip depth
- OEM+ heritage, modern execution
Icons Reimagined - Born in the '90s built for now.
- We didn’t just remake the LMGT1.
- We reimagined it—with enough brake clearance to stop a freight train.
- Because a function without a soul is boring.
- And style without clearance is useless.
- This wheel? It does both.
Big props to @Younes behind Supertech Racing
He dropped knowledge, shared critical dimensions, and helped us navigate a topic most wheel companies don’t even touch. Respect.
If you don’t know Supertech yet, fix that: Supertech R35 Brembo Conversion Kit