205/40R17 (205 40 17) Nankang AR-1 AR1 84W XL Semi Slick Track Day Tyres – Road Legal R-Compound Motorsport/Time Attack/Hillclimb – W Rated Extra Load (Sold Individually)

Sticky 205/40 R17 circuit rubber for serious lap time hunters

Chasing PBs on track and still want to drive home? This 205 40 17 semi slick is the go-to choice for frequent track day drivers who demand mega grip, razor sharp steering feel and dependable heat management. Street approved and competition proven, it delivers the pace and consistency you need for sprints, time attack and club racing while remaining perfectly usable on the road.

Engineered with a single compound and a 5.5 mm tread depth, this R-comp radial is all about outright performance and predictable handling. In 17 inch and above it features a kevlar reinforcement that improves stability at speed and keeps the contact patch composed during long hot sessions at demanding venues like the Nürburgring and Spa.

Trusted in control-tyre championships and on podium-winning builds, it is a favourite with our own team and our customers. We run these on our track cars and the feedback is the same every time: huge grip, repeatable performance and confidence on the limit.

Why enthusiasts choose this 205 40 17 semi slick

• High grip R-compound for rapid warm-up and consistent lap after lap pace
• Street approved with EU tyre labelling and MSA List 1B recognition
• Kevlar lining on 17 inch and larger for rock-solid high speed stability
• Single compound for predictable balance and easy setup
• Extra Load construction, 84 load index, W speed rating for confidence on powerful builds
• Proven in M3 Cup, 330 Challenge, Classic VW Cup, plus silverware in CSCC New Millennium and 750MC Club Enduro

Ideal for

• Track days, sprints, hill climbs, time attack and club motorsport
• Fast road use between events
• Hot hatches, coupes and lightweight track builds needing 205-section 17 inch tyres

Tech and setup guidance

• Operating window: approximately 71 to 104 degrees Celsius
• Camber: aim for negative 1.0 to negative 3.0 degrees depending on chassis
• Hot pressures as a starting point:
  • 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 for the best balance on alloy or steel wheels
• EU grip, efficiency and noise figures available on request

Fitment, support and setup

Sold individually so you can order exactly what you need. For professional installation, geometry and track-focused alignment, book in with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting and setup quote.

Search-friendly terms customers use: 205 40 17 semi slick, 205-40-17 track day tyre, 17 inch circuit tyre UK, road approved R compound, XL extra load performance tyre, W rated motorsport tyre, high grip street legal track tyre, fast road and track tyres.