I have a new to me 2008 GL1800 Honda with California Side Car trike. My front tire is a Michelin Pilot Activ 130/70R18 rear motorcycle tire mounted backwards. I have had several 2 wheel Goldwings and am a fanatic about tire pressures. I always kept the pressures at 41#s with good results. Research here suggests the best pressure for that tire should be about 38#s. For those of you running 38, have you had any unusual wear or cupping problems? I know that underinflation will result in cupping issues, but looking for advice from those with experience. Thanks..... Jim