It's aluminium pal. Lucky you don't teach materials engineering or something similar...
Sorry. Small screen. Sure I saw a Columbus sticker on the downtube and automatically thought steel... Should have checked. I say squeeze it any way. It is only 2.5mm pr chainstay
@Hulsroy started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
It's aluminium pal.
Lucky you don't teach materials engineering or something similar...