Quick answer: JWL, VIA and AS1638 are markings that show an alloy wheel has been designed and tested to recognised strength standards. JWL is the Japanese light alloy wheel standard, VIA is an independent registration mark showing a wheel has been tested against JWL, and AS1638 is the Australian Standard for light alloy wheels. Every SpeedWorks SW passenger wheel is certified JWL, VIA and AS1638 and rated to 690 kg per wheel.
Why wheel certification matters
A wheel carries the weight of the car, takes the twisting load of cornering, and absorbs every pothole and kerb. Two wheels can look the same and behave very differently once they're under load. Certification markings give you a basic assurance that the design has been checked against a published test standard and isn't just a good-looking casting.
For Australian buyers, certification also helps when you're dealing with roadworthy inspectors, modification rules and insurers. All three are more comfortable with wheels that carry recognised markings and a stated load rating.
JWL: the Japanese light alloy wheel standard
JWL stands for Japan Light Alloy Wheel. It's a technical standard for alloy passenger car wheels, set by Japan's Ministry of Land, Infrastructure, Transport and Tourism. The standard sets out tests a wheel design has to pass. These generally cover fatigue under repeated cornering and radial loads, and resistance to impact.
A JWL mark on a wheel is the manufacturer's declaration that the design meets the standard. There's a related mark, JWL-T, used for wheels intended for trucks and buses.
VIA: independent registration
VIA is the mark of an independent Japanese testing body that tests wheels against the JWL standard and registers the designs that pass. JWL tells you the manufacturer says the wheel meets the standard. VIA adds third-party testing on top. That's why the two marks usually appear together, and why buyers look for both.
AS1638: the Australian Standard
AS1638 is the Australian Standard covering light alloy wheels for road vehicles. Like JWL, it sets out performance tests a wheel design should meet. It's the standard Australian authorities and inspectors are most likely to recognise by name.
A wheel carrying all three markings has been checked against both the Japanese and the Australian standards.
Where to find the markings
Certification markings are usually cast or stamped into the wheel. Common places are the back of a spoke, the inner barrel, or the area around the mounting face, so they're hidden once the wheel is on the car. You'll often find the size, offset, PCD and load rating nearby. If you're buying a used wheel and can't find any markings, treat that as a reason to ask more questions.
SpeedWorks wheels at a glance
| Range | Certification | Load rating per wheel | Centre bore |
|---|---|---|---|
| SW passenger wheels (SW01 to SW10, SW12 to SW20, SW22, SW23) | JWL, VIA, AS1638 | 690 kg | 73.1 mm |
| SW 4x4 wheels (SW11, SW21) | See product page | 800 kg | 110.1 mm |
Our forged wheels are made to order from 6061-T6 aluminium and come with a limited lifetime structural warranty. Ask us about certification for a specific forged order.
Load rating: the number to check
Certification tells you a design passed a standard. The load rating tells you how much weight each wheel is designed to carry. As a general rule, a wheel's load rating should at least cover the heaviest load that wheel will see. Work that out from your vehicle's maximum axle loads (front and rear), divided between the two wheels on each axle. Your vehicle's compliance or tyre placard and owner's manual are the places to start.
For most passenger cars, sports cars and sedans in our customer gallery, a 690 kg rating per wheel is the figure to compare. For utes and 4x4s that carry loads or tow, our 4x4 wheels are rated to 800 kg each. If you're close to the limit, or you're running a heavy vehicle, message us before ordering.
Certification and modification rules in Australia
Wheel and tyre changes are covered by state and territory vehicle rules. These typically set limits on things like overall diameter, track width and how far the tyre may extend past the guards. Certified wheels make compliance easier to show, but certification on its own doesn't make every size or offset legal on every car. Check the rules in your state, tell your insurer about modifications, and use our offset calculator to compare a new setup with your current one.
Frequently asked questions
Are SpeedWorks wheels JWL and VIA certified?
Yes. All SW passenger wheels are certified JWL, VIA and AS1638, with a 690 kg load rating per wheel.
What's the difference between JWL and VIA?
JWL is the standard. VIA is an independent body that tests wheels against that standard and registers the ones that pass. Seeing both marks means the design has been tested by a third party, not just declared compliant by the maker.
Is AS1638 required in Australia?
Requirements depend on your state and the type of modification. AS1638 is the Australian Standard most often referred to for alloy wheels, and it's a sensible marking to look for.
Does certification mean a wheel will fit my car?
No. Certification is about strength. Fitment depends on stud pattern, offset, width, centre bore and brake clearance. Check our FAQ or message us with your car.
What warranty do SW wheels have?
SW wheels carry a 12-month warranty against defects in materials and finish.