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piston size and bore size

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Theres different letters for pistons actually. On modern bikes theres a marking on the cylinder. The service manual will tell u where the markings are, then u order according to that.  If you really must have a serious answer.

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If your bore is 54.5mm, then it's either been sleeved and bored, or it's beyond worn out, or someone doesn't know how to measure a cylinder.

 

The CR125 has had a 54mm bore since 1985.

 

If you go OEM, Honda only offers one size for replacements. The same goes for any aftermarket pistons, Vertex, Pro-X...

 

Wiseco offers a 54, 54.5, 55, and 56mm piston for the CR125.

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