225/40R18 Nankang AR-1 92Y XL Semi-Slick Track Day/Trackday Tyre/Tire - Road/Street Legal Motorsport UHP Racing | 225/40/18 225-40-18 225 40 18 225/40ZR18 | AR1 MSA List 1B (Sold Individually)

225/40R18 92Y XL semi slick performance tyre for circuit and street use

Chase quicker laps and confident road manners with this 225/40R18 92Y XL AR-1 style competition radial. This ultra high performance, semi-slick trackday tyre is street-use approved and trusted by serious drivers who want relentless grip, sharp steering feel and stable heat management. Ideal for fast road, time attack, sprints and club-level racing.

Size and spec highlights: 225/40R18, 225 40 18, 225-40-18 with 92Y extra load rating for heavyweight stability, precise turn-in and predictable balance.

Why enthusiasts choose it

• Sticky compound and 5.5 mm new tread depth for outstanding dry grip and repeatable lap-after-lap performance.
• Single compound philosophy delivers consistent behaviour and easy setup from cold to hot.
• Proven in competition as a control tyre in series like M3 Cup, 330 Challenge and Classic VW Cup, and a podium winner in open-tyre championships including CSCC New Millennium and 750MC Club Enduro.
• EU tyre labelled and MSA List 1B approved for UK motorsport eligibility.
• From 2019 production in 17 inch and above, a Kevlar lining enhances stability and consistency on high-energy circuits such as Nürburgring and Spa.
• Available across 13 inch to 20 inch fitments, making it a go-to choice for a huge range of performance builds.

Real-world results

We run these on our own cars and our customers keep coming back for the same reason: huge mechanical grip, fast warm-up and excellent stability under hard braking and high lateral load. If you are hunting PBs without sacrificing on-road usability, this is the tyre that delivers.

Setup guidance for best results

• Operating temperature window: 71 to 104 degrees Celsius.
• Suggested static camber: between -1.0 and -3.0 degrees depending on chassis and driving style.
• Recommended hot pressures:
  • Under 800 kg: 23 to 27.5 psi
  • 800 to 1000 kg: 24 to 32 psi
  • 1000 to 1400 kg: 27.5 to 37 psi
  • Over 1400 kg: 34 to 42 psi
• Balancing tip: align the yellow dot with the valve stem to minimise weights and ensure a smooth, true rotation.
• EU grip, efficiency and noise information available on request.

Fitting and alignment

For professional installation, geometry and corner weighting, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote and expert advice on pressures and camber specific to your vehicle.

Good to know

• Sold individually. Add two or four to your basket as needed.
• Perfect for track days, fast-road builds, club racing, hillclimb and time attack where List 1B rubber is permitted.

Ready to unlock lap-time and confidence from your 18 inch wheel setup? Get your 225/40R18 92Y XL semi-slick today and feel the difference on your next session.