I have 16" rims on my 2000 4x4 and was wondering if 15" rims would fit. I don't have to change but am trying to keep all options open.

I do believe so

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Truck: 2000 Ford Ranger XLT 4.0 4x4 ext cab
My Build Thread
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Mods: Brush guard|Front Hitch|Expo Roof Rack|Train Horn|Door/Dash/step/Hood Leds|2" lift|Rear Tow Points|On-Board Air System| 22" & 40" LED bar|and More!

Yes 4x4 Rangers came stock with 15" wheels

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2000 Ranger XLT 4x4 Flareside
3.0 Auto 3.73 gears
31x10.5r15 Mastercraft Courser AXTs
Manual mirrors, door locks and windows

Of course they will fit.

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2004 Ranger XLT
4.0 V6 4x4 Automatic
49K miles and 4.10 Gears

Bone stock as of right now, with the exception of plastidipped XLT emblems and wheels, a diamond plated Ultima toolbox, and the throttle cable mod