Porsche Wheel Spacers - The Complete Buyers Guide
Porsche Wheel Spacers - Complete Buyer's Guide (996 to 992, 987 to 718)
I get a lot of messages from Porsche owners asking about wheel spacers.
Most of them want the same thing - a more aggressive stance, wheels sitting flush in the arches, and that purposeful look that Porsche engineering deserves but doesn't always deliver from the factory.
The good news is that Porsche is one of the most straightforward platforms to fit spacers to. The bolt pattern is consistent across most models, the fitment specs are well documented, and the results speak for themselves.
This guide covers everything you need to know before you buy.
Does My Porsche Need Wheel Spacers?
Stand back and look at your car from the front or rear.
If there's a noticeable gap between the tyre and the wheel arch lip, spacers will close that gap and transform the look of the car. It's one of those modifications that sounds subtle until you see it - and then you can't unsee it.
Beyond the look, a wider track improves cornering stability and reduces body roll. If you've driven a 911 on a track day, you'll already know how planted the car feels. Spacers make it better.
There's also a practical reason. If you've fitted aftermarket wheels with a different offset to OEM, spacers correct the position and bring the wheel into the right place relative to the arch.
Porsche Wheel Spacer Fitment - The Numbers You Need
Most Porsche models share the same core fitment spec. This is one of the reasons Porsche is such a clean platform to work with.
Bolt Pattern: 5×130 PCD Centre Bore: 71.6mm Wheel Bolt: M14 × 1.5, ball seat, 19mm hex
That covers the 911 from the 996 through to the current 992, and the Boxster and Cayman from the 986 through to the current 718.
Here's the quick reference by model:
| Model | Generation | Years | PCD | Centre Bore |
|---|---|---|---|---|
| 911 | 996 | 1997-2006 | 5×130 | 71.6mm |
| 911 | 997 | 2005-2012 | 5×130 | 71.6mm |
| 911 | 991 | 2012-2019 | 5×130 | 71.6mm |
| 911 | 992 | 2019-present | 5×130 | 71.6mm |
| Boxster | 986 | 1996-2004 | 5×130 | 71.6mm |
| Boxster / Cayman | 987 | 2005-2012 | 5×130 | 71.6mm |
| Boxster / Cayman | 981 | 2012-2016 | 5×130 | 71.6mm |
| 718 Boxster / Cayman | 718 | 2016-present | 5×130 | 71.6mm |
The Cayenne uses a different centre bore, so if you're fitting spacers to a Cayenne, contact us first and we'll confirm the exact spec.
Ball Seat Bolts - Why This Matters on a Porsche
This is the bit most people get wrong, so I'll be direct about it.
Porsche uses a ball seat (radius seat) wheel bolt. Most other European cars - BMW, Mercedes - use a conical (tapered) seat. The two are not interchangeable.
If you fit a conical bolt into a Porsche wheel, it won't seat correctly. The contact area is wrong and the clamping force is uneven. That's a safety issue, not a preference.
When you fit spacers, your standard OE bolts are no longer long enough. The spacer adds thickness between the hub and wheel, so you need extended bolts that account for that extra distance. The rule is simple: OE bolt length plus spacer thickness gives you the minimum extended bolt length you need.
Every Brightstone Engineering Porsche spacer kit includes the correct extended M14 × 1.5 ball seat bolts matched to your spacer thickness. You won't need to source anything separately.
Hubcentric Spacers - Not Optional
Every spacer we make is hubcentric. That means it's machined to exactly 71.6mm centre bore to match the Porsche hub.
A non-hubcentric spacer relies on the wheel bolts to centre the wheel. On a car with Porsche's power and handling precision, that creates vibration, uneven bolt loading, and - at worst - bolt failure.
The hub carries the vehicle's weight. The bolts clamp everything together. That's how Porsche designed it, and a quality spacer maintains that relationship. The centre lip locates the spacer on the hub, the spacer's outer lip locates the wheel, and everything stays centred exactly as it should.
When I machine Porsche spacers, the centre bore tolerance is held within 0.02mm. That's what keeps things running smooth at motorway speeds.
What Thickness Should You Choose?
15mm is the most popular choice. It closes the gap between tyre and arch noticeably without pushing the wheel too close to the lip or affecting clearances for most setups. For a daily driven car or one that's not been lowered, 15mm is the right starting point.
20mm is for a more aggressive result. On a lowered car or one where you want the wheel genuinely flush in the arch, 20mm delivers a dramatic transformation - particularly at the rear of the 911, where the wide haunches really come alive with the wheel sitting flush.
If you're not sure, start with 15mm. Measure your current gap, work out where you want the wheel to sit, and contact us if you want a second opinion. We reply within 24 hours.
Are Porsche Wheel Spacers Legal in the UK?
Yes.
Wheel spacers are legal in the UK as long as the tyre doesn't protrude beyond the wheel arch. That's an MOT requirement under the Road Vehicles (Construction and Use) Regulations - it's not a blanket ban on spacers.
For most Porsche applications with 15-20mm spacers, the tyre stays well inside the arch. If you've significantly lowered the car, check your clearances before ordering.
Tell your insurer you've fitted spacers. They're a simple declared modification that most insurers accept without issue. Don't skip this step.
Porsche Wheel Spacers by Model
Porsche 996 (1997-2006)
The 996 divides opinion among Porsche purists, but nobody argues with how it looks with the arches filled. A 15mm or 20mm spacer makes a real difference to a car that can look a little conservative from the factory. Fitment: 5×130, 71.6mm centre bore.
Porsche 997 (2005-2012)
The 997 is widely regarded as one of the finest driving 911s. It also happens to respond brilliantly to spacers. The wider track improves an already excellent handling balance, and the visual change is immediate. Fitment: 5×130, 71.6mm centre bore.
Porsche 991 (2012-2019)
The 991 brought a wider body and electric power steering. Factory wheel fitment still leaves room for improvement - the 991.2 in particular responds well to a 20mm rear spacer. Fitment: 5×130, 71.6mm centre bore.
Porsche 992 (2019-present)
The current 992 looks best with the rear wheels sitting flush in those wide haunches. Factory fitment is conservative. A 15-20mm rear spacer sorts that immediately. Fitment: 5×130, 71.6mm centre bore.
Porsche 987 Boxster / Cayman (2005-2012)
The 987 is a fantastic mid-engined sports car that looks even better with a wider stance. 15mm all round is the most popular choice. Fitment: 5×130, 71.6mm centre bore.
Porsche 981 Boxster / Cayman (2012-2016)
One of our most popular Porsche applications. The 981 GT4 in particular looks stunning with a flush fitment. If you own one of these and haven't looked at spacers yet, have a look at what a 15mm or 20mm does to the stance. Fitment: 5×130, 71.6mm centre bore.
Porsche 718 Boxster / Cayman (2016-present)
The 718 platform shares the same 5×130 bolt pattern and 71.6mm centre bore as the models before it. Both the standard 718 and the GT4 RS benefit from spacers - the GT4 RS in particular looks purposeful with the wheels sitting flush. Fitment: 5×130, 71.6mm centre bore.
Fitting and Aftercare
Fitting is straightforward. Clean the hub face before you start - wire brush and brake cleaner, two minutes of effort. Any corrosion or debris between the hub and spacer will affect how it seats.
Torque the extended bolts to 130Nm. Use a calibrated torque wrench, not an impact gun. Re-check torque after the first 50-100 miles - this is a step most people skip and shouldn't.
After that, check bolt torque every six months as part of routine maintenance. If you drive through winter, clean the spacers and hub faces thoroughly afterwards. Road salt causes corrosion buildup that can lead to seizure over time.
Why Brightstone Engineering
We design and machine every spacer in-house at our UK workshop on Haas CNC equipment.
We don't import spacers and rebadge them. Everything is machined from aerospace-grade 6082-T6 billet aluminium, inspected before dispatch, and backed by a lifetime warranty against manufacturing defects.
Every kit includes the correct extended ball seat bolts matched to your spacer thickness, so you have everything you need for a safe fit.
If you're not sure which spacers suit your Porsche, contact us. We know this platform well and we'll give you a straight answer.
