Donut Spare Tire

Welcome to PriusChat. Your question has been discussed at length in previous threads.

New wheel (dealer) is pricey, $120, w/o a tire.

Depending on where you live in California, you can probably find one at a junkyard.

Or... go to car.part.com. (CORRECTION: car-part.com) They have a nationwide database. There might be a source near you. (there's a wheel available in a Houston auto recovery dealer, called Almeda, shipping probably isn't cheap)

 

It doesn't matter. The Toyota "donut" spare is 15-inches, whether your car comes with 15- or 17-inch original wheels.

 

The following numbers are for 2016-2019 Prii. I'm not sure if they apply to the 2020 AWD version. You'll have to cross-reference them on a Toyota parts site.
You'll need all of these parts to complete the mod, putting the spare tire under the floor.

Spare Tire Donut; T125/70D17 98M - (tire size, on the OEM 17" spare tire rim)
Carrier (Spare Tire Retainer) Toyota P/N 51931-47010 (hold-down bolt, bracket is already welded to the trunk floor)
Box, deck floor LH Toyota P/N 64997-47050
Box, deck floor RH Toyota P/N 64995-47040
Box, deck floor (Center) Toyota P/N 64993-47090

 

Well, the temp spare is either 16" (3rd gen) or 17" (4th gen), and either will do. The 16" 3rd gen option is more-or-less identical in outside diameter to 195/65R15 stock tire, while the 17" is oddly smaller, at least 2~3% IIRC. Bit of a puzzle why they changed.

I would go with 3rd gen:

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Gen 3 temp spare info:

rim p/n: 42611-20841
tire spec: T135/80D16 101M
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I stand corrected, and I apologize for the error. The donut spare in my '16 Three Touring is in fact 125/70D17

 

Will these parts work for a 2019 eAWD Two? I read elsewhere here that the rear electric motor takes up the wheel well space. Thanks!

 

Unfortunately no; Toyota engineers didn't break-a-sweat locating the AWD rear wheel components: