There is no definitive answer to this question as it depends on a number of factors, including the type of fish you are targeting, the size of the fish, the type of bottom you are fishing on, and the type of bait you are using. However, a good starting point is to use a gear ratio of 1:1 for bottom fishing. This means that for every turn of the reel, the line will be pulled through the guides one complete turn. This ratio will give you good control over your line and allow you to feel the bite of the fish. If you are using live bait, you may want to use a slightly higher gear ratio, such as 1:2, to give the bait a little more action.