3. Hardknott Pass, Cumbria
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Vale Street in Bristol is the UK's steepest residential road. Photo: Sam Saunders
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Clovelly's access road is a dream for cyclists. Photo: Graham Alton/Flickr
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The most famous and toughest of the Lake District climbs. Photo: Eifion / Flickr
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It may look pretty, but we don't recommend climbing in the frost! Photo: Phil Catterall
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"Um... I just meant a hair pin for my pony tail." Photo: SimonPix/Flickr
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Photo: Stephen McKay
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The gorgeous Rosedale Chimney climb provides beautiful views. Photo: Mike Dobson/Flickr
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Photo: Jenkin Road was central to the Tour de France festivities.
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Awk sure, it's barely even an incline. Photo: Stephen Elwyn Roddick
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Fancy a race with fellow cyclists? The Catford Hill Climb could be for you. Photo: Bareknuckleyellow/Flickr
3. Hardknott Pass, Cumbria
Even those of you not obsessed with climbing will have undoubtably heard of Hardknott Pass in the Lake District.
10 of the Toughest Bike Climbs in the World
An average gradient of 13 percent may not sound like much (in comparison to some of the other hills on this list), but when interspersed with gruelling 30 per cent inclines over the course of 2.2km, you’ll fairly be suffering by the time you reach the top.
Thank goodness the Lake District is so pretty, eh?