Phil,
Masis follow the "traditional" Italian formula regarding seat stay diameter. Up to 58cm frames use 14mm seat stays. 59cm and over use 16mm seat stays.
Brian Baylis
La Mesa, CA
USA
Some years ago I obtained from a friend the pieces to build an homage to Masi. I have am a 99th percentile body type and in 35 years have never found a Masi to fit me. But I've forgotten-welcome to old age-an important detail. 14mm or 16mm seat stays. Could an obliging Masi owner measure the stays below the scallop? Many thanks in advance. Phil Brown What was my name again in Oakland, Calif.