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Hi everyone!
I want to buy wheels for my ST150, so I found these, but I don't know if the wheel size is correct.
They are 17x7 ET45.
Thank you all
Wheel Automotive tire Hubcap Alloy wheel Bicycle part
 

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2007 Ford Fiesta V ST150 Tires and Wheels Size


Wheels and Tires Specs:
Stock tire size:175/65 R14 185/60 R14
Alternatives:185/55 R15 195/50 R15 195/45 R16
For tuning:205/40 R17
Pitch circle diameter (PCD):4*108
Center Bore Diameter (DIA):63,3 mm
Bolt size:12*1,5
Width of rim (J), Wheel Size, Offest (ET):5,5 x 14 ET47,5 6 x 14 ET40
Alternatives:6 x 15 ET52,5 6,5 x 15 ET45 6,5 x 16 ET45
For Tuning Wheels:6,5 x 17 ET45
 

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They are 17x7 ET45.
You have the diameter and width, along with the offset. You also need to know the bolt pattern.
R.S. added all the specs for your current / factory wheels. If you go down in diameter or have too high an positive offset, you may have interference with the brakes. A much lower offset and you will push the wheels out farther from the hubs. Either way a big change can prematurely wear suspension components.

I made a spreadsheet that allows you to type in the specs (except the bolt pattern) of your factory wheels and tires, and then you can type in other setups. It'll give you the changes in inches (it converts all the mm measurements) to amount of wheel in, wheel out, tire in, tire out, overall diameter, and difference to your speedo. It's an Excel spreadsheet but it'll open in OpenOffice, LibreOffice, etc. Just fill in the yellow sections.

The link here includes a decryption key:

or, if you feel not sure about clicking that, it's

and the decryption key is
9nY-wovXxQ6mQu5mpzO6QIlIknXZeH-bv2rdoiuoLJU

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