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Windows 98 SE, 2000, ME, or XP (Compatibility mode may be needed for Windows 10/11)

Intel Pentium III 1.0 GHz (Minimum) / Pentium 4 2.0 GHz (Recommended) RAM: 256 MB (Minimum) / 512 MB (Recommended) Storage: 3 GB available space GPU: 64 MB VRAM, DirectX 9.0c compatible Common Issues & Fixes Sonic Riders - PCGamingWiki

If you install the original 2006 PC version, it has very low requirements by modern standards:

Many players prefer emulating the GameCube version using the Dolphin Emulator , as it is often more stable on modern hardware and supports high-definition resolution patches. PC Technical Specifications