CAST ALLOY WHEELS ON OLDER BIKES – even BMWS – are prone to corrosion, especially where rim meets tyre and clip-on balance weights or frequent levering has damaged the surfaces. Which explains why pressure within my K75’s rear rubber had been steadily diminishing during late autumn. Solution? Whip off the wheel, pump up the tyre then wet and check for air bubbles. Next up, remove the tyre, inspect for mutilation then clean and gently abrade the rim as necessary with a wire brush, ideally of the electric rotating variety. I could, of course, have done this in my own workshop but my local Presteigne Tyre Services (01544 267240) are biker friendly and Dave let me watch as he expertly did it, replacing a knackered-looking valve stem for good measure. And when
the rim was refreshed, he applied a nonsetting rim sealant and replaced the tyre. Job done and my 32psi is now predictable and secure.