Did this ride at the weekend on my Langster, boy was it hard!
Think I will down gear to a 42 front ring if I do that ride profile again,48x16 is just too tough for some of those climbs, legs were dead. However held my own against the other guys on the geared, triple chainset bikes 
http://www.endomondo.com/workouts/t9gs43_NrQ8


http://www.endomondo.com/workouts/t9gs43_NrQ8