Funny, I was always under the impression that it was 20, and the front 25. The speed has a 27 front
I've seen several references to this, and this one is from the Spec sheet from Mazda's USA site that I saved on my PC years ago. A Protege ES, and P5 have 19's don't they?
<TABLE cellSpacing=0 cellPadding=2 width=515 border=0><TBODY><TR vAlign=top><TD width="50%">[font=verdana,arial,helvetica][size=-2]Front Suspension[/size][/font]</TD><TD align=middle width="25%" bgColor=#ffffff colSpan=2>[font=verdana,arial,helvetica][size=-2]Independent, MacPherson-Strut, coil springs & stabilizer bar (25 mm front stabilizer bar, 16% stiffer spring)[/size][/font]</TD></TR><TR vAlign=top bgColor=#cccc99><TD width="50%">[font=verdana,arial,helvetica][size=-2]Rear Suspension[/size][/font]</TD><TD align=middle width="25%" bgColor=#fffce4 colSpan=2>[font=verdana,arial,helvetica][size=-2]Independent, strut w/ TTL(Twin-Trapezoidal Link), coil springs & stabilizer bar (20 mm rear stabilizer bar, 19% stiffer spring)[/size][/font]</TD></TR></TBODY></TABLE>