Do 26 x 1.75 tires fit bikes that originally had 2.00 tires?

In most cases, yes, a 26 x 1.75 tire can fit a bike that originally had 2.00 tires. However, there are a few factors to consider to ensure a proper fit:

1. Rim Width: The width of the bike's rim plays a crucial role in determining tire compatibility. Wider rims are designed to accommodate wider tires, while narrower rims are meant for narrower tires. If the rim is too narrow for the tire, it may not provide adequate support and could cause the tire to roll off the rim. On the other hand, if the rim is too wide, the tire may be stretched excessively, which can affect its performance and safety.

2. Clearance: It's important to check the clearance between the tire and the bike frame, fork, and brakes. A tire that is too wide may rub against these components, causing interference and affecting the bike's handling and braking. Make sure there is enough clearance to avoid any potential issues.

3. Overall Diameter: Consider the overall diameter of the 26 x 1.75 tire compared to the original 2.00 tire. While both tires have the same rim diameter (26 inches), the 1.75 tire will have a slightly smaller overall diameter due to its narrower width. This difference in diameter could affect the bike's geometry, such as the seat height and bottom bracket height. If the difference is significant, it might impact the handling and comfort of the bike.

It's always recommended to check with the bike manufacturer or a professional bike mechanic to confirm tire compatibility and ensure a safe and proper fit before installing the 26 x 1.75 tires on your bike.