They can, as some Prius trims are factory-specified with this size, but you should always confirm using the tyre placard or handbook. Match the recommended load index and speed rating, and replace tyres in pairs on the same axle to keep handling consistent.
Only if your vehicle manufacturer lists 195/50 R19 as an approved alternative size. The smaller sidewall changes the overall rolling diameter, which can affect speedometer accuracy, gearing and ground clearance, so check fitment guidance and inform your insurer if required.
Use the exact specification shown on your current tyre sidewall or your vehicle placard, then match it across the axle. You can generally move to a higher load index or speed rating, but never lower, and some vehicles require reinforced (XL) versions in this size.
Yes, several manufacturers offer efficiency-focused patterns in this size to help reduce energy use, which is especially relevant for hybrids and EVs. Compare the EU tyre label for fuel efficiency, wet grip and noise, and prioritise wet grip if you drive frequently in heavy rain.
Summer tyres are usually best for grip and braking in warmer conditions, while all-season tyres can be a good year-round choice if you regularly face cold mornings and occasional light snow. If you drive in severe winter conditions, a dedicated winter tyre in the correct size is the safer option, and you should avoid mixing different seasonal types on the same axle.
