As a warning to ALL the teams using plaction wheels: absolutely DO not trust sprockets on those wheels to anything less than 6 through-bolts. Do NOT thread those fasteners into the plastic - use the locknuts. Finally, and perhaps most important, do NOT use the fasteners you get from Home Depot to hold those sprockets on. Those are low grade (usually 2) garbage and will stretch under the strain.
We learned about the bolts this year. Last year we used 3 home depot grade in each wheel with no issue. This year, we were short on fasteners on the practice bot so we tried 3 per and quickly sheared them. We moved up the 6 per wheel, but those kept loosening up. On our comp bot, the 6 bolts were JUST starting to break at the end of West Michigan - we had to call a time out to replace some and tension all the rest. (We have 8 wheel drive traction and have spent some time pushing
).
It's worth the money to pick up some grade 8's and do it right the first time.