The 1994 Porsche 928 sits at the end of Porsche’s front-engine V8 grand touring era, blending high-speed composure with a distinctly modern 1990s tire and wheel package. On this final-year 928, tire fitment is built around a staggered radial setup rather than a one-size arrangement. The GTS uses 225/45R17 at the front and 255/40R17 at the rear, both on 17-inch rims. That creates real choice within the correct sizes, including blackwall performance radials as well as select raised white letter and redline front-tire options. The key is keeping the front and rear sizes in their proper positions while matching the car’s intended appearance and road use.
Which Tire Size Is Right for The 1994 Porsche 928
The 1994 Porsche 928 uses two primary tire sizes, both in radial construction on 17-inch rims. Tire selection depends first on position, because the GTS front and rear fitments are different sizes in a staggered setup. Once that is confirmed, the decision becomes choosing the right tire line, sidewall presentation where available, and rim-width compatibility for the wheels actually on the car.
225/45R17 is a metric radial size with a 225-millimeter nominal section width, a 45-series profile, and fitment for a 17-inch wheel. On the 1994 Porsche 928, this size serves the GTS front position and is part of the car’s staggered radial layout. Available choices include BFGoodrich, Nitto, and Pro-Trac products, with blackwall options as well as select RWL and redline sidewall treatments. This size should be evaluated as a front fitment, with attention to wheel width and maintaining the intended balance of the front-to-rear tire pairing.
255/40R17 is a metric radial size with a 255-millimeter nominal section width, a 40-series profile, and fitment for a 17-inch wheel. On the 1994 Porsche 928, this is the GTS rear tire size, giving the car a wider rear fitment than the front. Product choices in this size include BFGoodrich, Nitto, and Vredestein, all in blackwall form across several performance-oriented tire series. This size should be chosen specifically for the rear position, with wheel-width compatibility and overall staggered setup preserved before any substitution is considered.
Sub-model fitment on the 1994 Porsche 928 is position-specific rather than shared front to rear. Checking whether you are replacing the GTS front or GTS rear tire matters first, because each end of the car uses a different size even though both fit 17-inch wheels.
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1994 Porsche 928 GTS Front
The 1994 Porsche 928 GTS Front uses a dedicated front tire size in radial construction on a 17-inch rim. That means the front tire should be selected as part of the staggered setup, with close attention to wheel width, sidewall style options, and maintaining the intended front fitment.
The 1994 Porsche 928 GTS Rear uses a different radial tire size than the front, also on a 17-inch rim. Rear tire selection should focus on preserving the correct staggered relationship, confirming wheel width, and choosing among the available blackwall performance tire lines in the proper size.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1994 Porsche 928 Tires for Sale
Available 1994 Porsche 928 tire choices center on the staggered 225/45R17 front and 255/40R17 rear setup, with BFGoodrich, Nitto, Pro-Trac, and Vredestein options. Buyers can compare tire series, blackwall versus select RWL or redline front-sidewall treatments, and rim-width specifications across the two sizes.
These FAQs focus on the 1994 Porsche 928’s staggered 17-inch tire fitment, including front-versus-rear sizing, rim compatibility, available brands and sidewall styles, and the checks worth making before road use on a grand touring car of this era.
Tire Size & Fitment
What tire size fits a 1994 Porsche 928?
The 1994 Porsche 928 uses a staggered tire setup rather than one size at all four corners. The GTS front fitment is 225/45R17, and the GTS rear fitment is 255/40R17. Both are radial tire sizes designed for 17-inch wheels, but they are not interchangeable front to rear as a standard replacement choice.
That makes position the first thing to confirm before choosing tires for a 1994 Porsche 928. Replacing one axle with the wrong size can disrupt the intended front-to-rear balance, so verify which end of the car you are servicing, then confirm the wheel width and actual wheel setup before selecting a tire line.
What size rim does a 1994 Porsche 928 use?
The 1994 Porsche 928 uses 17-inch rims with both of its primary tire sizes. The front 225/45R17 and rear 255/40R17 fitments share the same wheel diameter even though the rear tire is wider and uses a different profile than the front.
Wheel diameter is only part of the fitment picture on a staggered car like the 928 GTS. It is still important to confirm the wheel width at each end, especially if the car has aftermarket wheels or a replacement wheel set, because the correct 17-inch diameter alone does not guarantee that every tire in these sizes suits the wheel.
Why does the 1994 Porsche 928 have more than one tire size?
The 1994 Porsche 928 GTS uses two tire sizes because it has a staggered setup, with 225/45R17 in front and 255/40R17 in the rear. That arrangement pairs a narrower front tire with a wider rear tire while keeping both on 17-inch rims and in radial construction.
For tire replacement, that means the front and rear positions should be treated as separate fitment decisions, not as one universal size. Owners should confirm which axle needs tires, keep the front and rear sizes in their proper locations, and check that any wheel changes have not altered the width requirements for the intended tires.
Choosing the Right Tire
What should I consider when choosing a 225/45R17 and 255/40R17 tire setup for a 1994 Porsche 928?
Start with the correct position-specific sizes: 225/45R17 for the front and 255/40R17 for the rear on the 1994 Porsche 928 GTS. From there, compare radial tire lines by brand, sidewall appearance where offered, and wheel-width compatibility. This car’s setup depends on maintaining the staggered relationship between the two sizes.
A practical choice comes down to how the car is used and how closely the appearance should match your goals. Some owners want a straightforward blackwall performance look, while others may prefer a more distinctive sidewall treatment at the front. Wheel width, tire series, and overall consistency between front and rear all deserve attention before final selection.
What sidewall styles are available for 1994 Porsche 928 tires?
Blackwall is the main sidewall style available for the 1994 Porsche 928 tire sizes, and it appears across both front and rear fitments. In the 225/45R17 front size, there are also select RWL and redline options. The 255/40R17 rear choices shown here are blackwall.
That means sidewall appearance can become part of the decision, especially if the car is being tailored toward a more custom or era-specific presentation. It is worth thinking about how the front and rear sidewalls will look together, since a staggered car can appear visually uneven if the tire style chosen for one end does not suit the other.
What brands offer tires for the 1994 Porsche 928?
Tires for the 1994 Porsche 928 are available from BFGoodrich, Nitto, Pro-Trac, and Vredestein across the two primary sizes. The 225/45R17 front size includes BFGoodrich, Nitto, and Pro-Trac options, while the 255/40R17 rear size includes BFGoodrich, Nitto, and Vredestein options.
Brand choice should be considered alongside the exact tire series, sidewall treatment, and the wheel-width range that suits the tire. Since the front and rear sizes do not share the same full product mix, some owners may need to balance appearance and specification differences carefully to keep the complete set cohesive on the car.
Restoration & Appearance
Which tire should I choose for a period-style 1994 Porsche 928?
A period-style approach for a 1994 Porsche 928 starts with preserving the proper staggered radial sizes: 225/45R17 in front and 255/40R17 in the rear. Because this is a 1990s grand touring Porsche, the correct modern radial sizing and 17-inch fitment are central to keeping the overall look and stance in character.
Appearance then comes down to tire line and sidewall presentation rather than changing the basic fitment. Blackwall tires will usually deliver the most understated presentation, while select front-size RWL or redline options create a more customized look. For strict originality concerns, marque-specific references remain the best way to verify the most appropriate visual details.
How does tire construction affect the appearance of a restored 1994 Porsche 928?
On a 1994 Porsche 928, construction is straightforward because the primary fitment is radial. That suits the car’s late-production design and keeps the tire profile, wheel relationship, and overall presentation aligned with the 17-inch staggered setup used on the GTS front and rear positions.
The bigger appearance differences come from sidewall style and the proportions of the correct front and rear sizes rather than from switching between bias-ply and radial types. Keeping the intended 225/45R17 front and 255/40R17 rear arrangement matters for stance, while blackwall, RWL, or redline details shape whether the finished look feels restrained or more expressive.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1994 Porsche 928?
Yes, modifications can affect tire fitment on a 1994 Porsche 928 even when the replacement tires match the original size format. Aftermarket wheels, changes in wheel width or offset, suspension alterations, and ride-height changes can all influence how 225/45R17 front and 255/40R17 rear tires sit within the car.
A staggered setup leaves less room for assumptions, so it is smart to check the actual wheel dimensions and inspect clearance at steering lock and through suspension travel. Cars that have been lowered or fitted with non-original wheels deserve extra attention before installing new tires, especially at the wider rear position.
What should I inspect before driving a 1994 Porsche 928 on new tires?
Before driving a 1994 Porsche 928 on new tires, inspect the wheel condition, confirm that the front and rear tires are mounted in the correct positions, and check inflation pressure carefully. It is also worth looking over the valve stems, wheel hardware, and the general condition of suspension and steering components.
A short initial road test should include listening for rubbing, confirming straight tracking, and rechecking pressures after the tires have settled. Since the car uses different front and rear sizes, a final visual check of clearances and sidewall-to-wheel fit is a sensible step before extended highway use.
What should I check before a longer drive in a 1994 Porsche 928?
Before a longer drive in a 1994 Porsche 928, check tire pressure, tread and sidewall condition, and verify that the correct 225/45R17 front and 255/40R17 rear tires remain in their intended positions. Inspect for cracking, bulges, cuts, uneven wear, or slow air loss, especially on a car that may spend time parked between outings.
Longer trips are also a good reason to look over wheel condition and confirm that nothing in the suspension or alignment is causing unusual wear. A staggered grand touring car benefits from a careful pre-drive walkaround, because catching a mounting, clearance, or inflation issue early is far easier than dealing with it on the road.
