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GR Supra Mk5 vs BMW Z4 M Sport: Front Brake Upgrade Compared
Both packages are the same Paragon 348x36 mm 2-piece rotor paired with Winmax-manufactured pads in your choice of compound, and the rotor assembly is physically identical between the two SKUs because the GR Supra Mk5 3.0 and BMW Z4 G29 share the same OEM Brembo 4-piston caliper and the same 348x36 mm brake architecture. The Supra-titled kit is the natural order for A90/A91 owners, and the Z4 M Sport kit is its exact counterpart for G29 owners: same rotor, same pad shape (PBP1603), different OEM part-number cross-references and hub interface details that Paragon has verified per fitment. Choose the listing that matches your chassis and confirm your preferred compound with Alconkits at order time.
Spec Comparison
| Spec | GR Supra Mk5 3.0 Kit | BMW Z4 M Sport Kit |
|---|---|---|
| Rotor diameter | 348 mm (13.70") | 348 mm (13.70") |
| Rotor thickness (new) | 36 mm (1.42") | 36 mm (1.42") |
| Rotor thickness (minimum / discard) | 34 mm (1.34") | 34 mm (1.34") |
| Rotor type | 2-piece floating; slotted; directional ventilated | 2-piece floating; slotted; directional ventilated |
| Number of vanes | 48 directional vanes | 48 directional vanes |
| Rotor finish | CBN turned | CBN turned |
| Rotor ring material | CM-250 high-carbon cast iron, heat-treated | CM-250 high-carbon cast iron, heat-treated |
| Hat material | Hard-anodized 6061-T6 aerospace aluminum | Hard-anodized 6061-T6 aerospace aluminum |
| Hat fasteners | Stainless steel bobbins; 10-bolt | Stainless steel bobbins; 10-bolt |
| Rotor weight (each, assembled) | 11.3 kg (24.9 lbs), approx. 1.8 kg lighter than OEM per corner | 11.3 kg (24.9 lbs) |
| Caliper retained | OEM Brembo 4-piston (40 mm x 2 + 44 mm x 2) | OEM Brembo 4-piston (40 mm x 2 + 44 mm x 2) |
| Pad shape (Paragon / Winmax) | PBP1603, 75 mm depth | PBP1603, 75 mm depth |
| Available pad compounds | P2 (Sport Comfort), P3 (Road & Track), R5 (High Friction Track), R7 (Max Friction Track) | P2 (Sport Comfort), P3 (Road & Track), R5 (High Friction Track), R7 (Max Friction Track) |
| Minimum wheel size | 18" (OEM caliper envelope retained) | 18" (OEM caliper envelope retained) |
| OEM rotor cross-reference | Toyota 43516-WAA01 (L) / 43512-WAA02 (R) | BMW 34116860911 (L) / 34116860912 (R) |
| Broader fitment coverage | 2019+ GR Supra Mk5 3.0 (A90/A91) | 2020+ BMW Z4 G29; also G20, G22, G01, G02 variants with 348x36 front brakes |
OEM rotor weight for reference: the GR Supra Mk5 3.0 OEM front rotor is 13.1 kg (28.8 lbs) per corner, so the Paragon assembly saves approximately 1.8 kg per corner on the Supra fitment. BMW Z4 G29 OEM front rotor weight is not published; the shared Paragon assembly is confirmed at 11.3 kg assembled.
Paragon 2-Piece Front Kit for the GR Supra Mk5 3.0
The Supra Mk5 3.0 package is aimed at A90/A91 owners who are already pushing the OEM brakes hard on track days or spirited back roads and want to fix the root cause rather than replace pads twice a season. The 2-piece floating design lets the rotor ring expand independently under heat, which reduces the thermal stress that warps one-piece rotors. The 48-directional-vane configuration moves heat out of the rotor faster than the OEM plain-face unit.
Drop in the R5 or R7 compound pads and the setup is genuinely competition-capable; choose P2 or P3 and you have a daily-driven car that still sheds heat properly on a Saturday morning canyon run. The honest trade-off: this kit keeps your OEM Brembo 4-piston calipers, which are already a capable unit, so the upgrade is entirely about rotor thermal management, weight reduction, and pad compound range rather than increased clamping force or a larger swept area. If you want more piston area or a bigger rotor diameter, you are looking at a full big-brake kit, not this package. The 18-inch wheel minimum also means anyone rolling smaller wheels will need to confirm fitment before ordering.
Who it is for: track-day regulars and spirited street drivers on the A90/A91 who have outgrown OEM pads and want a rotor that will not cook under repeated hard use. Also a strong choice for Supra owners who simply want the visual detail of a slotted 2-piece rotor visible through their spokes.
Paragon 2-Piece Front Kit for the BMW Z4 M Sport
The Z4 M Sport package is the same hardware under a fitment-verified Z4 G29 catalog entry, complete with the correct BMW OEM part-number cross-references so there is no ambiguity about what you are replacing. The rotor assembly and pad shape are identical to the Supra kit, which makes sense: Paragon and third-party fitment data confirm both cars use the same Brembo caliper family (caliper stamp: 4x40-44/348/36) and the same 348x36 mm rotor envelope.
One practical note for Z4 owners: the Z4 G29 sees more varied duty cycles than the track-focused Supra, covering everything from commuting to weekend spirited driving. For that pattern, the P2 or P3 compound is the more sensible daily choice because the R5 and R7 track compounds need heat cycling to reach their friction window and are not at their best when cold. Paragon's Z4 listing also notes broader Gxx platform fitment coverage (G20, G22, G01, G02 with the same 348x36 M Sport front brake specification), which matters if you own more than one BMW on that architecture.
The trade-off is the same as on the Supra side: you are upgrading the rotor and pad, not the caliper. Clamping force and swept area stay at OEM levels. If you are running the Z4 M40i hard on track and want a genuine step up in bite, confirm with Alconkits whether a big-brake kit is available for your variant before settling on this package.
Who it is for: Z4 M Sport owners who want better sustained braking on track days or spirited drives, Z4 30i M Sport owners looking to match the thermal resilience of the M40i setup, and anyone on the Gxx platform who wants to resolve heat fade without changing calipers.
How to Choose
The decision between these two listings is almost entirely about which chassis you own. The rotor and pads are the same part; the SKU distinction exists so that Paragon's fitment verification and correct OEM cross-references land on your car rather than requiring you to cross-check Toyota versus BMW part numbers yourself.
Once you have the right listing selected, the compound choice is where real decisions get made. P2 suits a car that lives on the street most of the time and sees occasional spirited driving. P3 bridges street and light track use without the cold-start compromise of the competition compounds. R5 is the compound to choose if your car attends organized track days regularly and you are prepared to heat-cycle the pads properly. R7 is maximum friction for competition use.
If you are still undecided on compound or want to confirm that your specific Z4 variant (30i versus M40i, M Sport versus standard) uses the 348x36 front brake configuration, reach out to Alconkits before ordering. The rotor and pad package is made to order, so getting the compound right the first time saves lead time.
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