Pres­sure drop


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.

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