Mallorca 312 training with ChatGPT or Claude.

One entry, three distances: choosing on the road

You don’t enter a distance. Everyone starts together and chooses on the road: the 167 turns for home after the first block of mountains, near 97 km, and the 226 leaves the 312 near 193 km. You can change your mind without telling anyone, provided you’re inside the cut-offs.

The finish limits change how that choice works. The 167 and 226 both close at 5pm, but the 226 is 59 km longer. From a 7am start, the averages you need, stops included, look like this.

So the 226 isn’t a gentler 312. It asks for almost the same speed, for three and a half hours less. The real decision comes at the first split: if you can’t hold about 23 km/h through the mountains, the 167 is the ride. The second split is about whether you have those extra hours in you.

Where the climbing is

The organiser’s 2026 profile puts 5,050 m of climbing into the 312, and nearly all of it falls before about 160 km. Every route crosses the Serra de Tramuntana first: up the Coll de Femenia, then on to the highest point at Puig Major, 899 m, which the road reaches at 55 km. The stretch from the Gorg Blau feed at 50 km to the top was a timed segment.

After the long descent from Puig Major to Sóller, the 312 and 226 climb again through the west of the island. Beyond Sa Granja at 158 km, the 312 crosses the flatter interior and the east, through Lloseta, Ariany and Artà. That last 150 km is about rhythm, wind and riding in a group, not climbing.

The cut-offs, and the pace they really ask for

The 2027 rules fix the finish limits and say intermediate cut-offs appear in the route schedule, with a minimum average speed for each. Riders behind the minimum pace, or passed by the end-of-event vehicle, are out of the ride. In 2026 the 312 schedule looked like this.

The first one is the hardest to make. From a 7am start you have four hours and twenty minutes for 97 km with Femenia and Puig Major in it. Ask ChatGPT or Claude to work out your climbing speed at a sustainable power from your FTP and weight, then check whether it leaves room for a stop at Gorg Blau.

If you withdraw within the time limit, the organiser’s bus and support vehicle take you and your bike to the finish.

FTP, W/kg and pacing a 10 to 14 hour day

On the climbs, your speed depends on watts per kilogram; on the flat second half of the 312, it depends far more on your group and your aerodynamics. A rider at 3.5 W/kg and one at 2.8 W/kg can finish together if the lighter, stronger climber spends the afternoon alone in the wind.

A common approach is to hold the long climbs well below threshold, often around three-quarters of FTP, so the legs still work at 250 km. That only means something if the FTP is current. Keep it in Athmex with the date you tested it, and a stale or estimated FTP stops quietly rescaling every number in the plan.

Bikes must be conventional road bikes with two brakes. Time trial and triathlon bikes with extensions, fixed gears and e-bikes aren’t allowed, and a helmet is compulsory.

Building towards a late-April mountain day

A late-April date means the build sits in winter. Long outdoor rides are hard to come by in January, so the plan has to use indoor sessions for climbing-specific work and save the weekend for duration.

Hours matter more than any single session. Tell ChatGPT or Claude what you can actually train each week and it can shape the months around that, rather than a template written for someone with twice the time.

Feeding a day of up to 14 hours

In 2026 the solid-food stops on the 312 were at Gorg Blau (50 km), Sa Bastida (101 km), Coll des Pi (114 km), Es Capdellà (137 km), Sa Granja (158 km), Lloseta (194 km) and Ariany (244 km), with mechanical help at the aid stations. On the 167, the stops were at Gorg Blau, around 99 km and at Lloseta (135 km).

Carbohydrate is what runs out. Many endurance riders aim for somewhere around 60 to 90 grams an hour once they have trained their gut to take it. Practise the amount, the food and the timing on long winter rides, and keep your plan in the event’s notes in Athmex so every conversation starts from it.

Entry, the waiting list and race weekend

General entry for 2027 has opened, and the organiser now runs a waiting list. It also sells entries with accommodation, and opens an official marketplace for resold entries from 1 December to 31 March. Athmex doesn’t sell or manage entries.

Bibs are collected at the event expo on Avenida s’Albufera in Platja de Muro on Thursday 22 and Friday 23 April, from 9am to 9pm, in person only. Plan to arrive by Thursday, build the bike and ride an easy hour before the day.

Questions to bring back during the build

A Mallorca build runs from midwinter to late April. These are the moments to come back, with the question you might ask.