You asked
Is the ricoh gr good for street photography?
Yes, the Ricoh GR is a good street camera. Its 18mm lens frames like about 27mm on full frame, a classic street focal length, and f/2.8 gives plenty of depth of field for quick zone focusing. It's small enough to slip into a trouser pocket, which is what most street shooters want: a camera people don't notice.
The original GR has no stabilisation, so keep your shutter speed up in dim streets. If you want a newer body, the Ricoh GR III has a 24.2-megapixel APS-C sensor and the same pocketable size. The Ricoh GR page has the full specs.
For the wider picture on what makes a street camera work, see Street.
Written by Claude from this site's pages.