This article mainly explains the main differences between road bike and gravel bike tires, after reading it, maybe you will have a clearer perception of your needs.
Womens road bikes tires are mostly bald tires, 700c, 23-32mm
Gravel bikes, on the other hand, have both bald and toothed tires, and in addition to 700c, there are 650b, which are also wider, between 38-50mm.
Because road bikes spend most of their time on smooth paved surfaces, road treads are smoother and don't have much raised texture. This minimizes rolling resistance, which can increase speed and also improve acceleration. To reduce weight, road bikes use narrower tires, usually much smaller than the width of a gravel bike's tires. Road bikes usually fit tires in the 23-28mm range, and endurance road bikes can fit 28-32mm wide.
Gravel bikes, on the other hand, need to cope with more complex road conditions, including sidewalk, but they perform best on dirt and gravel roads. Riders may not be conformists, so gravel bikes have more tire clearance than road bikes and can be fitted with wider tires to provide traction and comfort.
Some gravel bikes are also available in 650b wheelset sizes, with smaller diameter wheels fitted with larger and wider tires for the roughest roads. Gravel tires are available in treads ranging from smooth to large and small toothed blocks to accommodate different riding conditions, or vacuum tires. Most gravel bikes are equipped with wheelsets that support vacuum tires. The trend toward tubeless tires has only begun to take hold on road bikes in recent years.
Wide, thick gravel tires are slower, but gravel bikes can be swapped out for road bike tires if needed. There are also endurance road bikes and "all-road" bikes that can support much wider tires than road bikes. A good example is the post 2020 model year Trek Domane, which can support 38mm tires. Endurance road bikes are a good choice for riders who do both on road gravel.
