Dunwich Dynamo
Plus 2025

What the Dunwich Dynamo Is

The Dunwich Dynamo is one of Britain's most distinctive overnight cycling events. Roughly 1,000 riders leave Hackney in East London each July, riding through the night across Suffolk to the shingle beach at Dunwich on the North Sea coast. No timing. No medals. No infrastructure. Just the road, the dark, and however many miles you've agreed to put yourself through.

The standard route is approximately 115 miles. I started at Kings Cross and finished in Norwich. 148.25 miles. The Dynamo was the middle section.

The Numbers Before the Start Line

I had slept zero hours the night before. The best I managed was a four-hour nap earlier in the day. By the time I clipped in, the data had already delivered its verdict.

Every conventional metric said the same thing: don't do this ride. Conventional metrics have never been written for bodies like mine.

Into the Night

London faded behind me as the riders spread out along the road. Headlights flickered through the darkness like a slow-moving constellation. Some rode in groups. Some rode in pairs. I rode alone. No peloton. No drafting. No support vehicle. Just me, the road, and a body that has spent decades learning how to function despite itself.

The first pedal stroke

Pain arrived immediately. With each revolution of the pedals my right knee shifted partially out of place. Subluxation. Again. And again. Every pedal stroke produced the same sharp instability, the muscles around the joint firing desperately to stabilise something that refused to stay stable. Then the spasms started.

Pain rose quickly, settling into familiar territory where most people would stop entirely. Stopping was never part of the plan. Breathing first: slow, controlled breaths to keep the autonomic nervous system from tipping into full fight-or-flight. Then pacing. Never think about the full distance. Just the next stretch of road. The next junction. The next mile.

The Sonic Shield

I wear Shokz OpenRun Pro 2 bone conduction earphones when I ride. They sit against the cheekbones, leaving the ears fully open so I can still hear traffic and everything happening around me. Situational awareness matters when you're riding through the night.

The music is not entertainment. It is a deliberate pain management tool. When pain spikes hard enough, the brain becomes obsessed with it — every nerve signal amplified, attention collapsing inward until pain becomes the only thing the mind can hear. Aggressive rhythm fills the sensory field and interrupts that process. The beat gives the brain something else to hold onto.

Three drum loops. That is all I need to get through. Then three more. Then three more. When joints are slipping and nerves are screaming, rhythm becomes survival.

Mile 64 — the GI shutdown

At mile 64 my digestive system shut down completely. Anyone who rides long distances knows how critical fuelling is. My gastrointestinal tract does not behave normally. Gastroparesis means food can simply stop moving. At mile 64, it did.

I had prepared for this through fasted Zone 2 training — teaching the body to rely more on fat metabolism when carbohydrates are unavailable. But preparation and reality are different things. The last 33 miles would be ridden completely fasted, in full metabolic shutdown.

The Impossible Zone

When I left Dunwich, most of the riders were finished. They were standing on the beach watching the sunrise, drinking tea, waiting for trains back to London. My route turned north. Toward Norwich.

That stretch became what I now call the Impossible Zone. Extreme fatigue. Joint instability. Pain spreading through hips and spine. My legs continued turning the pedals almost automatically, muscle memory carrying most of the load. My joints were not simply sore. They were shifting. Pain stopped rising and falling. It stabilised into something constant. Burning. Relentless.

But stopping was never an option. Because for me, stopping often means something worse than pain. It means surrendering the system I've spent decades building.

The sleep deprivation

An overnight ride on a zero-sleep baseline is a cognitive challenge as much as a physical one. The Cognitive Prosthesis carries more weight in those conditions: objective data replaces subjective judgement entirely because judgement, when sleep-deprived, cannot be trusted. Every 10 miles, the bone conduction headphones delivered the numbers. Heart rate, power, pace, cross-referenced against the 80% ceiling. The data was the pilot. I was the engineer keeping the systems running.

Norwich

148.25 miles. 12 hours 28 minutes. 5,748 feet of elevation. Average heart rate 141 bpm. Maximum heart rate 185 bpm. Solo. Unsupported. Done.

The Recovery

The day after the ride, my HRV had dropped to 26ms. My system was in overload. But recovery for me is never passive. It is engineered.

Steam. Sauna. Steam again. Sauna again. Heat exposure, cooling cycles, and constant HRV monitoring. Slowly the nervous system began to rebound: 40ms, then 65ms before sleep on day three. Within 72 hours my parasympathetic system had surged back into strong recovery territory — despite the sleep debt, despite the metabolic shutdown, despite the pain.

This is what recovery looks like when you've built the right systems. It is not rest and hope. It is intervention, protocol, and physiological reinforcement.

What This Ride Proved

Dunwich Dynamo Plus 2025 is not my longest ride. It is not my fastest. What it represents is consistent execution of Prosthetic Physiology under a simultaneous convergence of maximum stressors: zero sleep, HRV of 17ms, Body Battery of 37, Stress score of 98, right knee subluxation from the first pedal stroke, GI shutdown at mile 64, 33 fasted miles, and adverse weather across the Suffolk coastal stretch.

Every one of those variables would justify not starting. Together they form the actual conditions under which the framework was tested and verified. The system held.

I don't get to choose my conditions. I get to choose how I manage them.