I've been using them on all grass and dusty, bumpy grass tracks and they seem to work really well. Didn't like them on really wet grass, the ballistic green is better in my opinion, but equally competitive on a damp grass track when compared to schumacher green mini spikes.
Haven't run them on astro, so can't comment there.
What are you guys running up front with them? The fronts give a serious amount of bite in my experience. Schumacher yellow or green spike seem a decent combination on a 2wd on grass but not sure about astro.
Biggest down side is how bad they smell!!!
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