Whats the correct/acceptable size of center bore diameter for a Ranger?

70.3

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98 Ranger some stuff done

PNW Crew

And whats a good size for backspacing?

stock is 4.5 inches

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1990 Ranger Extended Cab
2.9L V6 5 Speed Transmission
Planning to put a 347 and a T-5 in it eventually

So a rim with the center bore of 80.77mm would be too big?

Yep. Not a good idea to let the lugs do all the work. The wheels are designed to center on the hub so you don't get any wobble from an off centered wheel and it takes most of the side load off the lugs as well.

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap

well i mean really all center bore is is the size of the hole in the center so it would still be centered but just larger so it would be closer to the lug holes

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1990 Ranger Extended Cab
2.9L V6 5 Speed Transmission
Planning to put a 347 and a T-5 in it eventually

No, wheels are designed to be hub-centric, meaning it should fit exactly. The lugs aren't designed to take the stress of a non-hubcentric wheel. If they arent touching, the wheel is pretty much impossible to be centred.

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-Alex
'10 Ranger XL 2.3L Manual
Mods: Stereo, Tint, Weatherguard rain shields, Intake silencer removal, LED brake, turn signal, reverse, license plate, and dome lights, DDM HID's (currently removed), lowered, 17" wheels with spacers, Explorer autodim mirror with Autolamps, Magnaflow exhaust, Buggman LED 3rd Brake Light...

Oh, you can center then if you really want to. I know a couple people who did. They issues with their lug breaking and such though and finally saw the light.

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Sgtsandman's Work in Progress
2011 Ranger XLT, 4X4, 4 door Super Cab. 4.0L, 5 Speed M50D-R1HD, 3.73:1, 8.8" open differential, Jason Pace cap
2019 Ford Ranger STX FX4, Super Crew, 2.3L Ecoboost, 10 speed automatic, 3.73:1 with rear locker, Leer 100XR cap

I can't find any black rims with the 70.3mm center bore