I’m not sure on the newer ones but you can on my 2 hecklers (97&9 I cannot remember off the top of my head but I think it’s either the first or last 2 numbers the indicate the year. Also have a look on the sc website at the bottom of the page listing the current bikes is the archive this is quite useful as it has pretty much allthe different bikes and versions of that bike including distinguishing features and sizes and geometry. Also it seems that the hecklers where built to order and so can have rear swing arm from a different year to the front triangle as it just depended where on the rack it was picked from. HTH