Shimano Infinity drive Explain (what is infinity drive and does it serve a purpose) 

In any fishing reel the less friction there is between moving parts will always increase the reels performance. In spinning reels I find that to be more important when it comes to the main shaft and pinion gear. If there is a part that separates the two from making contact with each other during use will always increase the reel performance and feel. Thats the idea of Shimano infinity drive and the main purpose it serves. It helps to keep the main shaft centered and eliminates friction between the main shaft and pinion gear when retrieving under heavy loads. Other brands does it differently which serves the same purpose.
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