There's no set answer to that. 700C AKA 28" AKA 622 mm ETRTO tell you the diameter where the tire will fit, but it doesn't say anything about where the spokes will go.
Things that influence spoke length:
If you just need to replace a single one, remove another spoke (from the same side of the wheel). Measure from inside of bend to the tip(in mm) and you'll know what to get.
If you want to build a wheel, well better do your homework first. I'll post a link below.
When choosing a bike wheel set in the 700c size, consider features like weight, material, rim depth, spoke count, and hub quality. These factors can affect the performance, durability, and overall ride quality of the wheels.
Bike rim tape 700c is a protective strip that covers the spoke holes on the rim of a bicycle wheel. Its purpose is to prevent the inner tube from getting punctured by the sharp edges of the spoke holes. By providing a smooth surface, the rim tape helps maintain proper tire pressure and reduces the risk of flats, ultimately improving the overall performance and durability of the bicycle wheel.
When choosing 700c bicycle wheels, consider features like durability, weight, rim width, spoke count, and compatibility with your bike's brakes and tires. These factors can affect the performance and handling of your bike.
The recommended 700c rim width for optimal performance on a road bike is typically between 19mm to 25mm.
When selecting a 700c bike rim for optimal performance and durability, key features to consider include the material of the rim (aluminum or carbon), the rim profile (depth and width), the number of spokes, the type of braking surface, and the weight of the rim. These factors can impact the overall performance and durability of the rim on your bike.
A bike tire size chart for 700c wheels typically includes information on tire width, recommended tire pressure, and compatible rim sizes. It can help you choose the right tire for your bike based on your riding preferences and needs.
To replace a bicycle spoke, first remove the damaged spoke by loosening the nipple at the rim and hub. Measure the length of the spoke and purchase a replacement of the same size. Thread the new spoke through the hub and rim, then tighten the nipple to secure it in place. Finally, true the wheel to ensure it spins smoothly.
A bicycle rim strip is a protective strip that covers the spoke holes on the rim. Its purpose is to prevent the inner tube from getting punctured or damaged by the sharp edges of the spoke holes. The rim strip acts as a barrier between the inner tube and the rim, reducing the risk of flats caused by the spoke holes.
It gos dead center behind the rim each line most not pass the fattest edge of the rim ...
between the hub and the rim.
Any rim that can take one 700C tire will take any other 700C tire, after a fashion. But just because the tire will fit the rim doesn't guarantee that the tire will fit in the frame or fork. 23C to 28C isn't much of a difference, but if you go crazy wide there's a risk that the wider tire won't sit that well on a narrow rim.
42/2pi is 6.68inches