Do all modern bikes look like a Session? If that's what you believe then you may have a difficult time with this quiz. We stripped off all branding, colours and decals from these bikes and left you just one way to identify them - the shape of their frames. Some of them are very distinctive whereas others you'll have to look beyond the Horst link and try and find some other details to separate them. We've picked 20 bikes from the current day and then 10 wildcards from the past 25 years for those that want some extra nerd kudos. Let us know how you got on in the poll at the bottom.