Often, a bicycle rim and a bicycle tire must be match correctly to the bicycle rim. A mismatch between the two will lead to poor handling of the bicycle. When mismatched, the bicycle will not feel stable when riding the bicycle, whether riding straight or turning.
To ensure good handling from the bicycle, the width of a bicycle rim should be matched with the width of the bicycle tire. If the bicycle rim and tire is of the correct match, the bicycle will have good grip on the ground, and will feel confidently when turning. Historically, many bicycle rider used narrow bicycle rims for cross-country riding.
How to Match Bike Rims and Tires
Using narrow bicycle rims caused the tires to have a squared-off profile, which emphasized the speed of the bicycle over the stability of the rider. As the trails became more difficult, however, riders began to use wider bicycle rims. These wider bicycle rims enabled the tires to have a more roundly shape, which allowed the tires to have more traction with the ground.
The increased use of these wider rims did not significantly increase the weight of the bicycle components in rotation, so they were a common choice for riders that performed more aggressive riding on the trails. Using narrow bicycle rims with wide bicycle tires will lead to the sidewall of the tire collapsing inward. This shape of the bicycle tire will lead to poor traction when turning.
Using wide bicycle rims with narrow bicycle tires will lead to the casing of the tire being stretched too thin. This thin casing will lead to pinch flats or bead blowouts if the bicycle tire pressure is too low. Using a bicycle tire whose width is approximately double the internal measurement of the bicycle rim will allow for a neutral profile for the tire.
This neutral profile allow for the treads of the tire to remain engaged with the ground. The riding discipline will help determine the best choice of bicycle rims and tires in width. Cross-country racing event use thin bicycle rims and tires to allow for the bicycles to quickly accelerate.
Mountain trail riding uses medium-sized rims and tires to allow the tires to smoothly roll over obstacles. Downhill and enduro events use wide bicycle rims and tires to better absorb the impacts with the ground and maintain stability. Fat bikes use extremely wide bicycle rims and extremely wide bicycle tires to provide flotation for snow or sand.
The diameter of the bicycle wheel also play a role in the performance of the bicycle. Bicycles with 26-inch wheels are often used for freeride bicycles because 26-inch wheels are easy to maneuver. Bicycles with 27.5-inch wheels are often used for trail bicycles because 27.5-inch wheels provide a good balance between rolling over obstacles and playfulness in the ride.
Bicycles with 29-inch wheels are often used for cross-country bicycles because 29-inch wheels easily roll over obstacles. Regardless of the diameter of the wheel, the size of the tire must be scaled to the width of the bicycle rim for the bicycle to feel correctly. Tubeless setups also impact the type of bicycle rims and tires that can be used with a bicycle.
Hookless bicycle rims are often made of carbon and are lightweight. However, you must only use hookless bicycle rims with a pressure limit of approximately 40 PSI. Any increase in the pressure of the bicycle tire above 40 PSI can cause the bead of the bicycle tire to unseat from the hookless bicycle rim.
Hooked bicycle rims are more flexible and can use either inner tubes or tubeless bicycle tires. Each of these rim types can be paired with tubeless-ready bicycle tires to allow for lower tire pressures. Using lower tire pressures with bicycles can increase the traction of the bicycle and provide a better ride feel.
The material of the bicycle rims can also impact the weight and durability of the bicycle. Carbon bicycle rims are often lighter and available in a wider diameter than aluminum rims. Carbon bicycle rims are a good choice for individuals who need to ride up a lot of hill.
Aluminum bicycle rims are more durable and can take more abuse on the road. However, they can be heavier than carbon bicycle rims. Because the wider the bicycle rims are, the more mass the rotating mass of the bike will be.
The greater the rotating mass of a bicycle, the more difficult it will be for the rider to accelerate the bicycle. Thus, there is a trade-off between the increased grip from the wider bicycle rims and the increased weight of those rims. Bicycle rims and tires are often specified when building or upgrading a bicycle.
The first specification to look at is the type of riding that you will do with your’n bicycle. Following that identification of the bicycle riding style, the bicycle rim and bicycle tire specifications to check are the frame clearance, spoke tension, and sidewall specifications of the bicycle tire. The wider the bicycle rims are, the thicker the rim tape and the taller the rim beds have to be to provide a proper seal between the rim and the tire.
Another check is to read the ETRTO code to ensure that the bicycle rims and tires are compatible. Finally, bicycle rims and tires must be tested at low tire pressures to test how the bicycle and it’s component perform.
