I am trying to order a set of rings for my 81.5mm us itr pistons and they only have domestic size by inches.
Also is a 81.5mm a .20 over piston? I am getting confused on this build. I hate rare pistons. No one stocks a ring for this piston.

 

81mm = 3.1889in
81.5mm = 3.2086in

Yes 81.5 is a .20 oversized piston.

 

yeah, thats semi correct. the bore sizes you gave are correct.

.010" = .25mm
therefore 81.5mm is a .020" oversize piston.

 

Alight guys thanks for the confirmation, now I just gotta find someone who stocks them.

 

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Americans and they're darn stubborness to never go metric so instead we have to confuse the hell out of oneanother. Who you ordering from?

 

I had good luck with hastings in the past. I may buy from the dealer since I get a discount.

 

well Honda only sells .25mm oversize so you will not be able to buy the OEM rings. try hastings again