Yes, small straight bevel gears can handle high speed, but there is a limit. Because the gears are small, they have less mass. Less mass means less inertia. Less inertia means they can accelerate and decelerate quickly without damaging themselves. This is good for high-speed operation. However, the noise problem of straight bevel gears still exists. At high speeds, the impact from tooth to tooth happens more often. At 500 RPM, the impact happens about 8 times per second. At 5000 RPM, it happens about 80 times per second. That is a buzzing sound. Some applications tolerate this buzzing. Power tools, for example, are already noisy from the motor and the cutting action. The gear noise is not noticeable. Other applications, like laboratory instruments, cannot tolerate this noise. The practical speed limit for small straight bevel gears in most applications is about 5000 to 8000 RPM. Above that, other gear types like spiral bevel gears or planetary gears become a better choice. For applications between 1000 and 5000 RPM, small straight bevel gears work well. They are used in many power tools, small robots, and automotive accessories at these speeds. The key is to test the gears in your actual application. Noise is subjective. What is too noisy for one user may be fine for another. If your application is not noise-sensitive, small straight bevel gears can run at surprisingly high speeds without failure.