Here's a ride taking in at least 4 tough climbs and you can probably squeeze some more in on the way: Warm up from York to Pateley Bridge. Climb Greenhow Hill with its multiple ramps then descend to Grassington, head north up Wharfedale to Buckden then up Langstrothsdale Chase. Climb Fleet Moss from the south side and descend to Hawes (WATCH OUT ON THAT DESCENT!). Have lunch there, then turn round and go back over Fleet Moss from the harder north face. Wipe your lunch off you and your bike after the 25% section at the summit and head back down the way you rode out, as far as Kettlewell. Turn left there and climb the mighty Park Rash, bringing up any residual lunch as you grovel up ... Refuel at the top and find a scenic route back to York!