2006 Trek XO 1, 50 cm (centre-to-top - for sizing reference, current owner is 5'7"). This is a great entry-level cyclocross bike that would - and has - doubled as a commuter / hybrid. Current owner rode it as a CX bike for a few years before having it rebuilt as a commuter, which is how it was used (sparingly) the past 8 years. It was just rebuilt to its original cyclocross format and tuned by Velofix, anticipating this sale. Good condition. Detailed specs found here: https://archive.trekbikes.com/au/en/2006/trek/xo1#/au/en/2006/trek/xo1/details, noting that this bike has been modified from this original spec (e.g. different wheelset).