I think they come with too thick grease from the factory, which when teamed with heavy trials use can cause damage if the pawls don't engage properly and they slip, if you bed them in by riding around a fair bit or thinning the grease out then it's not a problem. I'm not sure if polo would put quite as much through the freewheel as trials so shouldn't be a problem, maybe on the charge but I doubt it due the the massively high gear we use.
I think they come with too thick grease from the factory, which when teamed with heavy trials use can cause damage if the pawls don't engage properly and they slip, if you bed them in by riding around a fair bit or thinning the grease out then it's not a problem. I'm not sure if polo would put quite as much through the freewheel as trials so shouldn't be a problem, maybe on the charge but I doubt it due the the massively high gear we use.