Men's: US size minus 1 = UK size (US 9 = UK 8). Women's: US size minus 2.5 = UK size (US 7 = UK 4.5).
The Ride is available in standard, wide (2E), and extra wide (4E) in men's. If you typically need a wide fitting, check availability for the specific colourway before ordering.
If you usually wear Nike: Ride fits similarly — standard size is the right starting point. If you usually wear Brooks Ghost: the Ride fits slightly narrower at standard width. If you usually wear ASICS: most runners find standard Ride sizing consistent with ASICS.
With the shoe on and laced: press down at the toe end of the shoe. A thumb's width of space between your longest toe and the end of the shoe is correct. No space means size up. More than a thumb's width means consider sizing down.
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Source: Saucony size guidance from saucony.com.