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Hi Ian.
Diameter is what you measure.Here's an example http://www.mathopenref.com/diameter.html
Measured across the face of the wheel not the back.
Coach wheels are usually 14mm.Hornby & Bachmann make them.
Diameter is what you measure.Here's an example http://www.mathopenref.com/diameter.html
Measured across the face of the wheel not the back.
Coach wheels are usually 14mm.Hornby & Bachmann make them.