I have been using the same set of answer shoes on my speed motor for 3 gallons now. They perform the same as new. Just installed the 3rd set of springs and changed the clutch pins once. 2 gold and 2 silver springs have worked the best for me with the 8t 2.0. Just keep an eye on the end of the spring so it doesn't score the bell. I started snipping a little off the end of the spring even when new to prevent the clutch bell from being scored. Springs seem to be a little longer than stock losi's. I haven't thrown away any shoes since switching to answer. And for the price they are one of the best bargains in rc.