According to different models, road wheels are divided into these categories

According to the model, the wheels of road bikes are mainly divided into three categories: road bikes, time trial/triathlon and all-terrain road bike/CX road bike. Let's talk about the difference between the three types of wheels.

Excluding the shape and structure of the wheel set, the width of the rim is also different due to the different tire widths used in the three models.

Nowadays, road vehicles generally use 25-28c tires, so general wheel manufacturers will optimize the wheels for these two specifications. Due to weight control, aluminum alloy wheels are generally not too wide. Nowadays, the mainstream inner width is 17mm and the outer width is about 22mm; the disc brake aluminum alloy wheels will be slightly wider by about 2mm because there is no brake edge.
Because carbon fiber wheels are lighter, manufacturers can use some radical designs, such as widening the rim to improve stability in crosswinds. Starting from HED, manufacturers have begun to widen their rims. Among them, Roval is the most exaggerated. CL/CLX50's 20.7mm inner width and 29.4mm outer width wheels directly achieve the upper limit of rim brakes.
Since the disc brake rims are no longer limited by the brake side, manufacturers once again let themselves go. For example, ROVAL’s Rapide front wheels directly achieved an outer width of 35mm...but the inner width remained at 21mm, which is basically the upper limit of road rims.
Because all-terrain road vehicles will be fitted with wider tires or gear tires, the wheel rims they use will become wider. 700c specifications generally use 28-42c tires; if mountain tires are required, 650B specifications will be used. The inner width of the rim is generally about 25mm, and the outer width is about 30mm. All terrain road wheels are basically vacuum specifications.
Compared with all-terrain road bikes that tend to have fun attributes, CX has the characteristics of short-distance racing, so CX wheels attach great importance to performance. The rims will be narrower than all-terrain road wheels, and a tube tire version will be launched to pursue lightweight Advantage.
The biggest difference from road wheels is that in order to reduce wind resistance, the time car basically uses all-carbon closed wheels for the rear wheels. The front wheels also have special three-lobe or four-lobe cutters for the driver to choose (of course, there are also drivers who prefer to use traditional front wheels. Spoke wheel). The time trial/triathlon pursues speed and aerodynamic efficiency, and basically does not use wide tires. 25c is the top. It is said that many professional drivers are still using 23c tires...so the wheels of the time trial are basically not too wide.
Triathlon wheels cannot be directly applied to the timing car routines, because the triathlon track is long and the environment is changeable, and the wheels need to be selected according to the actual environment. For example, the windy KONA World Championships prohibits the use of closed wheels. Therefore, the general tricycles use ultra-high-frame carbon fiber wheels. If the road conditions are not good, 28c tires may be used.

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