What is The Cobblemonster?

It’s London’s original and best Urbosportive! Or, in plainer terms, it’s a bike ride around a route marked out for you across some challenging terrain, right here in the capital, inspired by the iconic Paris-Roubaix.

We will start from 9am at Herne Hill Velodrome, SE24 9HE departing for cobbles and climbs aplenty before finishing back at the Velodrome for a victory lap, followed by food, drinks, men’s Paris-Roubaix and (fingers crossed) the traditional Cobblemonster raffle.

We can’t wait to see you all again on Sunday 7th April 2024 at Herne Hill Velodrome. 

Please register here so we know to expect you on the day!

Herne Hill Velodrome, 104 Burbage Road, London, SE24 9HE from 9am
Herne Hill Velodrome, 104 Burbage Road, London, SE24 9HE


More info on the route will appear in the days before the ride.

The route will depart from Herne Hill Velodrome and descend into the melee of the west end, blatting across some early secteurs of the Smokes’ Victorian pave before tucking into the east end and its myriad lanes of snaking cobbled nadgery.

We then cross the river to start a series of LBCs (Lung Bursting Climbs) which increase in frequency before the descent from Crystal Palace to the finish at Herne Hill Velodrome, where you can finish  a flying lap, in homage to Paris-Roubaix (helmets mandatory for the velodrome lap, sorry!).

The route is designed for riders of all abilities, all bikes welcome, and encompasses a number of London Overground-enabled bail out points for those that suffer with mechanical or physiological events. For some this will be the biggest bike ride they’ve ever taken on, for others it may seem like a gentle spin. We guarantee all riders will know they have ridden their bikes.


Registration for Cobblemonster 2024, Sunday 7th April is now open!

To sign-up, just fill in our entry form here.

Entry is free but we recommend a donation to our official charity Evelina London Children’s Hospital. Our guideline donation is £15 and this has remained the same since the very first event in 2009.

If you’re taking part it will help a lot if you donate upfront, although you can give us cash on the day too.

The generosity of our punters has meant over £35,000 has been raised since 2009. In the words of the immortal Brixton Cycles Workers Cooperative, we salute you.


As ever our target charity is Evelina London Children’s Hospital and all profits from the event go their way.

You can donate ahead of the ride by visiting our donation page hosted by JustGiving.

Donate online to Evelina London

Alternatively, you can donate directly here. Please do Gift Aid if you can.

The Evelina London Children’s Hospital’s neonatal unit cares for around 900 babies a year, and has some of the best survival rates in the UK. They provides around one in five of the UK’s kidney transplants in children and cared for over 55,000 young patients last year.