In 1952 with the introduction of the Abu Ambassadeur 5000 (red reel), the modern baitcasting reel was using a 3.8:1 gear ratio. It had bushings and I have some from the 1950s and 1960s that I collect that can still launch a bait but are very slow in retrieve by modern standards. In about 1966, Abu released the 5000C (black reel) that just featured bearings instead of bushings. In 1972, Abu launched the high speed 5500C in at 4.7:1 with the circular right plate sticker that said "High Speed" and it was the quickest reel at the time. Even the first Lew's made by Shimano in the late 70s had a 3.8:1 gear ratio until Lew Childre moved production to Ryobi in the early 1980s and they upped the gears to 4.7:1. They made BB1, then BB1N, then BB1NG (gold), then BB1NGH (gold high which came in 5.3:1). With the narrow "V" spool of the Lew's, the IPT increased even though the gear ratio didn't. Throughout the 1980s, Daiwa, Shimano, and then later Abu used 5.3:1 reels in their lineup as their speedier models. One exception was made in 1987/88. Daiwa introduced the PT33SH which was 7.1:1 and stayed in production until 2015/2016. It was fast but didn't have alot of power in the gearing. 6.3:1 became a mainstay in the early 1990s with Daiwa's TD1Hi and TD1Hi Tournament reels. Abu had the Pro Max, Black Max, SM round reels in 1600, 3600, 5600, and 6600 that all "caught up" with 6.3:1. Shimano had the Chronarch, Curado, Coriolis, etc. In the early 2000s, 7:1 reels were the new hot thing until they became "average speed in the early 2010s with 8, 9, and now 10:1 reels. Sorry for the history lesson but anything in the 5.3:1 - 8:1 will cover all most all bases for all baits. Best wishes on the water!