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996 Posts
If the rims are the same width/depth the CF would not be any "faster", but most CF rims are wide or deep and are made to be more aero. More aero=faster if you got the engine.
 

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Boyd Cycling owner
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377 Posts
There are three forces that slow you down when you are riding. Resistance, aero, and gravity.
Resistance forces are things like tires hitting the ground, bearings, and chain. Rolling resistance is the biggest of these items (tire contact with pavement) and it's consistent wattage no matter what speed you are going, usually a very small percentage of your overall wattage.

Gravity forces is what slows you down when you go uphill. Here is where weight matters. When you are going uphill a lot of your wattage is used to overcome gravity, when you are going downhill there is negative forces for gravity.

Aero forces are used to cut through the air. The wattage used to overcome this exponentially rises with speed. So the faster you are going, the more being aero will help you. Wheels are a very small amount of being aero, but when you have worked on position or to get that extra couple of percent, aero wheels can definitely help. Even though they are slightly heavier than lightweight low profile wheels the majority of forces you are trying to overcome (unless you are purely climbing) will be to cut through the air. When you are climbing the speeds are low enough that you are not overcoming aero forces, and that is where having a lightweight wheel is an advantage.
 

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wut?
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507 Posts
There are three forces that slow you down when you are riding. Resistance, aero, and gravity.
Resistance forces are things like tires hitting the ground, bearings, and chain. Rolling resistance is the biggest of these items (tire contact with pavement) and it's consistent wattage no matter what speed you are going, usually a very small percentage of your overall wattage.

Gravity forces is what slows you down when you go uphill. Here is where weight matters. When you are going uphill a lot of your wattage is used to overcome gravity, when you are going downhill there is negative forces for gravity.

Aero forces are used to cut through the air. The wattage used to overcome this exponentially rises with speed. So the faster you are going, the more being aero will help you. Wheels are a very small amount of being aero, but when you have worked on position or to get that extra couple of percent, aero wheels can definitely help. Even though they are slightly heavier than lightweight low profile wheels the majority of forces you are trying to overcome (unless you are purely climbing) will be to cut through the air. When you are climbing the speeds are low enough that you are not overcoming aero forces, and that is where having a lightweight wheel is an advantage.
Nice post!:thumbsup:
 
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