Good evening everybody,
this week I had new tires mounted and used a set of Turbo wheels I had sourced many years ago and that had been lying about over the same time. They are clearly not immaculate - but after all it is a driver’s car and with some spots and pickles the chromed wheels are lining up with the rest of the car.
First point: initially, it looked like the Turbo wheels had a larger inset than the stock wheels. However, the Turbo wheels carry the same data as the original stock steel wheels: 6JK x 15 x 35. The original wheels sport the Dunlop logo and “921A”. The Turbo wheels likewise say “LP921A”.
Second point: I had the tire shop check the “new” wheels prior to installation. They found considerable flaws both lateral run out and concentric run out. However they tested two of the original Dunlop wheels which were found to be just as flawed. So we installed the chrome wheels. No ill effect so far.
Now, the one thing that got me curious was that on the Dunlop steel wheels there were codes hit into the wheels after production, namely “J4E”, “K4E”, “K4E” and “K4D”. Could it be that Dunlop checked their own wheels post-production and bundled them in pairs of four that were found to be matching somehow? What else would be the purpose of these codes?
75 XJ6L 4.2 auto (UK spec)