At a recent rear tyre change, I was told they had to remove the RDC sensor to get the tyre off - the factory fit Anakee 3 on my new GS. First time I'd ever heard that in 2 years of GS ownership and perhaps 8 rear tyre removal/replacements (new tyres and puncture fixes). Why does it matter? The pin retaining the RDC sensor to the rim sheared as the "operative" tried to remove the sensor. Why was he removing the sensor? Because he couldn't get the tyre off - "It's the wrong size tyre on here mate. It's only a 170, should be a 180. It's too tight". Was I being fed a line? I rather suspect so.