Trek 8900 Composite Mountain bike frame. Bonded Carbon & Aluminium. Hard to show in the photos but the paint over the carbon has a purple glitter in which looks awesome in the sun. 17 1/4 centre to top. 21 1/2 top tube. There are quite a few age related marks as expected from a used mountain bike. Thank you for looking at my item. Please check out my other car and bike parts. Please ask for a quote if you live in the highlands or Islands.