Myself and buddy STer have just completed RaceTech upgrades, we both went for custom G3 rear shocks, our stats are similar, 180lbs , we tour panniers full with pillions around 150lbs, both our shocks arrived with the same configuration and 21.4 kg/mm springs which appears to be on the light side for two up with luggage. I've not ridden my bike yet but did call RaceTech to query the spring rate , the reply was as we have custom built shocks the RaceTech website spring calculator does not apply! Anyone else have a custom G3 shock and had a similar experience? I did measure the rear sag on my bike which is 55mm with just rider and no preload, thats more than I expected.