Why Upgrade
Why Upgrade from OEM Porsche Wheels
Factory Porsche wheels are better than most OEM fitment. That is the honest starting point. But they are built around constraints you do not share.
| Issue | What It Means |
|---|---|
| Weight | Cast and flow-formed construction needs more material to hit strength targets. On a 992 running a 21-inch rear, that adds up quickly, and every gram is both unsprung and rotating. |
| Fixed Geometry | Porsche picks one offset per wheel package. If you have run PCCB brakes, fitted rear-axle steering, lowered the car, or moved to a wider tyre, the factory offset is a compromise rather than an optimum. |
| Cost of Replacement | A damaged OEM 21-inch rear is expensive, and the finish options are limited to what Porsche offered that model year. |
What you gain going forged: quicker direction changes, better damper control over broken surfaces, more brake clearance headroom, and the ability to specify width and offset around your actual setup rather than accepting a catalogue compromise.
Construction
Why Forged Wheels Are Ideal for Porsche
Forging compresses a solid billet under enormous pressure, keeping the aluminium grain tight and continuous. Serious forged blanks start heavy and get machined down; some manufacturers press blanks near 120 lb before machining under presses rated around 10,000 metric tons. That is the difference between a wheel shaped by pouring and a wheel shaped by force.
OEM cast vs Flow-formed vs Forged
| Comparison | Cast | Flow-Formed | Forged |
|---|---|---|---|
| Grain Structure | Porous, loose | Denser barrel | Tight, continuous |
| Strength-to-Weight | Baseline | Better | Best |
| Failure Mode | Can crack | Mixed | Tends to bend |
| Load Rating per kg | Lowest | Mid | Highest |
| Custom Width & Offset | No | Limited | Fully custom |
| Price | Lowest | Mid | Premium |
Track use
For track use the durability case is straightforward. A 911 puts high lateral load through the outside rear wheel under sustained cornering, and heat from a hard-worked brake package soaks into the barrel. Forged construction handles that thermal and mechanical cycling better than cast, and it is why serious track cars have run forged for decades.
For a Taycan
For a Taycan the argument shifts but does not weaken. At roughly 2,300 kg, the car needs a higher load rating per wheel, and the extra mass makes damper control over rough surfaces more valuable, not less. Lighter wheels also reduce the energy spent accelerating rotating mass, which matters on a car where efficiency is measured
Fitment
Porsche Fitment Guide
Almost the entire modern range shares one specification. The 911, 718 Cayman and Boxster, Taycan, Panamera, and Cayenne all use a 5x130 bolt pattern with a 71.6mm centre bore and M14x1.5 lug bolts torqued to 160 Nm (118 lb-ft). The Macan is the outlier at 5x112 with a 66.6mm bore.
| Fitment Detail | What You Need to Know |
|---|---|
| The Ball Seat | Porsche uses an R14 ball (spherical) seat. Many aftermarket wheels, particularly those designed around BMW or other German fitment, use a 60-degree conical seat. The two are not interchangeable. Fitting conical-seat wheels with Porsche's ball-seat bolts leaves the wheel improperly clamped and creates a wheel-detachment risk. Either the wheel is machined for ball seats or the hardware is changed to match. Confirm this before anything else. |
| Bolts, Not Studs | Water-cooled Porsches thread bolts directly into the hub, so there is nothing to hang the wheel on while you start the threads. Many owners fit a stud conversion to make wheel changes easier. |
| Centre-Lock | GT3, GT3 RS, Turbo S, and some GTS models use Porsche's proprietary centre-lock hub. These cars cannot take 5-lug wheels. The wheel must be built for centre-lock architecture from the start, so identify your hub type before specifying anything. |
CRITICAL: The Macan uses 5x130 — except 5x112 with 66.6mm bore. All other models are 5x130 with 71.6mm centre bore.
| Model | Bolt Pattern | Bore | OEM Front | OEM Rear | Hardware |
|---|---|---|---|---|---|
| 992.1 Carrera / Carrera 4 | 5x130 | 71.6mm | 8.5Jx19 ET52 | 11Jx20 ET66 | M14x1.5 ball seat |
| 992.1 Carrera S / 4S / Targa 4S | 5x130 | 71.6mm | 8.5Jx20 ET53 | 11.5Jx21 ET67 | M14x1.5 ball seat |
| 991 narrow body (C2 / C2S) | 5x130 | 71.6mm | 8.5J ET49–51 | 11.5J ET68–78 | M14x1.5 ball seat |
| 991 wide body (C4S / GTS) | 5x130 | 71.6mm | 8.5–9J ET49–51 | 11.5J ET48–56 | M14x1.5 ball seat |
| 718 Cayman base | 5x130 | 71.6mm | 8Jx18 ET57 | 9.5Jx18 ET49 | M14x1.5 ball seat |
| Taycan 4S (20") | 5x130 | 71.6mm | 9Jx20 ET54 | 11Jx20 ET60 | M14x1.5 ball seat |
| Taycan (19") | 5x130 | 71.6mm | 8Jx19 ET50 | 10Jx19 ET47 | M14x1.5 ball seat |
| Macan | 5x112 | 66.6mm | Varies, approx. ET19–21 | Varies | M14x1.5 |
CRITICAL: The Macan uses 5x130 — except 5x112 with 66.6mm bore. All other models are 5x130 with 71.6mm centre bore.
Sizes
Setups by intent across the 19" to 21" range:
| Goal | Front | Rear | Tyre Pairing |
|---|---|---|---|
| 992 OEM+ Street | 20x8.5 ET42 | 21x11.5 ET62 | 245/35R20, 305/30R21 |
| 992 Wider Stance | 20x9 ET41 | 21x11.5 ET58 | 245/35R20, 305/30R21 |
| 718 Flush Street | 20x9 | 20x11 | 245/30R20, 295/30R20 |
| 718 Balanced | 19x8.5 | 19x10.5 | 235/35R19, 285/30R19 |
| 718 Track | 18x9 | 18x10 | 245/40R18, 285/35R18 |
Models
Popular Porsche Models
| Model | Build | Notes |
|---|---|---|
| 911 (992 / 991) | 20 or 21 inch staggered | Most requested Porsche fitment. 5x130, 71.6mm bore. Rear-engine layout is fitment-sensitive |
| 718 Cayman / Boxster | 19 or 20 inch | Mid-engine balance. Lighter builds welcome 18s on track |
| Taycan | 20 or 21 inch | Electric weight makes forged essential. 5x130, 71.6mm bore |
Two more practical notes. Porsche offsets look strangely high compared to other brands (ET50 to ET67 is normal, not a typo), so do not "correct" them toward numbers that look familiar from BMW or Japanese fitment. And Porsche runs direct TPMS sensors, so those physically live inside each wheel and must be transferred or replaced when you change sets.
Finishes
Popular Porsche Models
Every RRT finish is powder coated for heat cycle durability.
Porsche 911
The most fitment-sensitive car in the range. Narrow body and wide body variants take different rear offsets, PCCB and rear-axle steering both change clearance, and centre-lock cars are a separate architecture entirely. Porsche 911 rims are also where the biggest weight savings live, because the 21-inch rear is the heaviest corner on the car. Specify around your exact variant, not "992."
Porsche 718 Cayman
Factory offsets are conservative, in the ET45 to ET57 range, which leaves genuine room for a more aggressive setup without touching the bodywork. Watch spoke design for brake clearance on S and GTS cars if you go down in diameter.
Porsche Taycan
Heavy, quick, and sensitive to unsprung mass. Load rating matters more here than on the sports cars. One practical note: the lug bolt socket size changed from 19mm to 17mm on build dates from late October 2022, so confirm which your car uses before ordering hardware.
Pricing Guide
A custom forged set for a Porsche typically runs $4,000 to $12,000+. What moves the number:
| Cost Driver | Effect |
|---|---|
| Diameter and Staggered Width | A 21-inch 11.5J rear needs substantially more billet and machining than a 19-inch front. |
| Construction | Monoblock versus multi-piece changes material and assembly cost. |
| Hub Architecture | Centre-lock builds require different engineering than 5-lug. |
| Finish | Standard powder coat is base; custom colour, brushed, and two-tone finishes add cost. |
| Load Rating Target | Track and Turbo applications need higher targets, meaning more material and validation. |
| Bespoke Offset and Brake Clearance | Engineering time around PCCB, rear-axle steering, and big brake packages. |
Straight talk on value: if your car is standard and stays on the road, good OEM wheels are already decent and forged is a refinement rather than a fix. If you track the car, run PCCB, have changed ride height or tyre width, or own a centre-lock model where options are limited, forged is where the real gains are.
Our Process
THE ENGINEERING BEHIND RRT FORGED
Every wheel goes through a precision-engineered process from billet to finished product.
10,000 Ton Forging
Each wheel begins as a solid 6061-T6 aluminum billet, pressed under 10,000 tons of force. This aligns the grain structure to follow the wheel's load paths, creating maximum strength at minimum weight.
5-Axis CNC Precision
Every wheel is machined on 5-axis CNC to tolerances of ±0.5mm. The hub bore is cut to your exact vehicle specification for a hub-centric fit with no spacers or adapters.
Finite Element Analysis
Before any wheel reaches production, it undergoes FEA simulation to map stress concentrations and optimize spoke geometry. Material is removed where load doesn't travel, making the wheel lighter and stronger.
Inspection & Testing
Every wheel passes through dimensional inspection, surface quality checks, and load testing before dispatch. We maintain full traceability from billet to finished product.
6061-T6 Aircraft Grade
We use only 6061-T6 aluminum — the same alloy used in aircraft construction. No porosity, high fatigue resistance, and predictable strength under repeated load cycles.
Send us Your Requirements
Why Upgrade
Why Choose RRT Forged
Machined for one car
Model, variant, hub type, brake package, and target offset all feed the design, including correct 71.6mm bore and ball-seat machining. No spacers, no adapter rings.
Aerospace-grade 6061-T6 aluminium
monoblock forged with 5-axis CNC machining and load-path optimisation.
Load ratings engineered to the application
which matters on a Taycan's mass or a tracked 911's cornering loads.
Global shipping
with fitment confirmed before any billet is cut.
Car Lifetime structural warranty
on the wheel structure.
FAQ's
Are forged wheels worth it?
For track use, modified cars, and heavier models like the Taycan, yes. Forged wheels cut unsprung and rotating weight while raising strength and load rating, which improves turn-in, damper control, and durability under sustained cornering and brake heat. For a standard road car, factory Porsche wheels are already good, so treat forged as a refinement and a fitment solution rather than a fix for a problem.
What size wheels fit a Porsche 911?
Five-lug 911s use 5x130 with a 71.6mm bore and M14x1.5 ball-seat lug bolts. A 992.1 Carrera S runs 8.5Jx20 ET53 front and 11.5Jx21 ET67 rear on 245/35ZR20 and 305/30ZR21. The base Carrera runs 8.5Jx19 ET52 and 11Jx20 ET66. Offsets differ between narrow body and wide body cars, and GT3, GT3 RS, and Turbo S models use centre-lock hubs that will not accept 5-lug wheels at all.
Are forged wheels better for performance driving?
Yes. Lower rotating and unsprung mass improves acceleration, braking, and how well the suspension controls the tyre, and forged construction resists cracking under the thermal and mechanical cycling of track use. The gains are real but incremental, so they matter most when the rest of the car is already sorted.
Will BMW or Audi 5-lug wheels fit my Porsche?
Generally no. Audi and Mercedes use 5x112 and BMW commonly uses 5x120, neither of which matches Porsche's 5x130. Even where a bolt pattern coincidentally lines up, most German aftermarket wheels are machined for a 60-degree conical seat while Porsche requires an R14 ball seat. Match the seat type or the wheel is not properly clamped.
Build your set
The wheels are the last place on a Porsche where factory compromise is still worth removing. Lighter, stronger, machined to your exact hub type and brake package, with the right seat and the right bore, and no spacers doing work that engineering should have done. Send RRT your model, variant, hub type, and brake specification, and fitment gets confirmed before anything is machined.