17×9″ and 18×14″ Center-Lock Speedline Wheels for Jaguar XJ220

Speedline center-lock wheels for the Jaguar XJ220 is an exercise in extreme rarity. These magnesium-alloy wheels are staggered not just in diameter (17″ front / 18″ rear) but massively in width to accommodate the car’s unique transaxle and mid-engine proportions.

Listing Details

• Four Speedline Corse Wheels
• Designed for Jaguar XJ220
• Silver-Finished Alloy Construction
• 17×9″ Fronts w/33.4mm Offset
• 2x Part #SL720
• 18×14″ Rears w/19.2mm Offset
• 2x Part #SL721

1. Technical Specifications

The XJ220 was fitted with these specific dimensions to handle its 210+ mph top speed:

• Front: 17 × 9.5J (often referred to as 9″)

• Rear: 18 × 14J

• Bolt Pattern: Single Center-Lock (Splined hub with a large conical nut).

• Material: Cast Magnesium Alloy (manufactured by Speedline in Italy).

• Design: Five-spoke “Star” pattern with the “Jaguar Sport” logo usually embossed on the center cap or spokes.

2. The Magnesium Factor (Safety Warning)

Because these wheels are magnesium, they are subject to “intergranular corrosion.” Over 30+ years, the magnesium can become brittle or develop microscopic cracks, especially if the protective paint/powder coat has been chipped.

• X-Ray/NDT Testing: If you are buying a used set, it is highly recommended to have them X-rayed or Zyglo-tested (dye penetrant) before mounting tires.

• Refurbishment: Standard powder coating can be dangerous for magnesium wheels because the high oven temperatures can outgas the metal. They require specialized “chromating” or low-temp wet painting.

3. Tire Availability (The 18×14″ Struggle)

The biggest challenge with the 18 × 14″ rear wheels is finding rubber. For years, the XJ220 was “grounded” because no one made the 345/35 ZR18 rear tires.

• Bridgestone: In recent years, Bridgestone (in partnership with Don Law Racing) re-engineered the Expedia S-01 specifically for the XJ220.

• Michelin: Some owners use Michelin Pilot Sport alternatives, but the 14″ width makes fitment extremely specific.

4. Market Value (2026 Estimates)

As XJ220 values have climbed past the $600k–$800k mark, spare parts have followed suit.

5. Where to Find Them

• Don Law Racing (UK): The world’s foremost XJ220 specialist. They often have the only remaining stock of original or certified refurbished Speedlines.

• Specialist Auctions: Occasionally appear on Bring a Trailer or Sotheby’s Sealed as “Garage Art” or spare sets from liquidated collections