Our 6" plaction wheels started to exhibit cracking in the spokes almost immediately after we started going over bumps at competition weight.
Mistakenly, I ignored the crack in our competition robot wheel, as it was only on one half of one spoke. In semifinal match 1 at the Seattle regional, the wheel shattered into three pieces, splitting at each of the three bolts we were using to attach the drive sprocket.
We were able to swap in a wheel after using our time out and run semifinal 2, though because it was our front wheel, we couldn't make it over the bumps. We ran chain again before the finals and were back in full working order.
As mentioned earlier in this thread, we'd now recommend that all teams use all 6 bolt holes on these wheels.
