Marin frame number..

[Hector8]

My new project, I think it's a 1994 model year built at the Marvel factory.Have measured from the bb to the top of the seat tube and it's 20". But I know Marin measured them from the bb to the center of the top tube.So the c in the frame number refers to what size?

 

[Rotorhead]

It looks like a 17.5”. Very nice! It’ll be c-c measured as you know https://www.retrobike.co.uk/archive/1994-marin-catalogue.530/download

 

[Hector8]

It looks like a 17.5”. Very nice! It’ll be c-c measured as you know https://www.retrobike.co.uk/archive/1994-marin-catalogue.530/download

Thanks,I thought that the c might be 17.5..