1 in 20

The Basin, Australia

The 1 in 20 is a col with a length of 6.7 kilometer. This is a category 3 col. It is located in The Basin, VIC, Australia. The average grade of this col is 4.2% with a maximum of 5.5%. The 1 in 20 ascents from 192 meter at the start, to 469 meter at the top, with a total of 277 ascending meters.


1 in 20 Profile


Distance 6.7 km
Elevation gain 277 m
Average grade 4.2 %
Maximum grade 5.5 %
Climb category 3
Minimum elevation 192 m
Maximum elevation 469 m

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The 1 in 20 is Melbourne’s most popular cycling climb. Winding its way up Mountain Highway from The Basin to Sassafras this gentle climb provides a fantastic way for cyclists of all abilities to test themselves.

The climb gets its name from the average gradient with which it climbs up into the Dandenong Ranges National Park. Like so many of the roads running through the Dandenongs, this section of Mountain Highway is truly breathtaking with its wide variety of native flora and fauna.