The B100 Cursa dels Nassos will be held on December 31, 2025. It is organized by the Barcelona City Council together with La Sansi / Sportlife and is part of the FCA calendar. The start will take place on Selva de Mar Street with different waves, the first at 5:15 p.m. The official race website is www.cursadenassos.barcelona.
The minimum age to participate is 16 years old. Participants aged 16 and 17 must provide signed authorization from a parent or legal guardian during registration. Failure to comply will be the participant’s sole responsibility, and the organization will not accept any claims on this matter.
The race distance is 10 kilometers, officially measured and certified by the Catalan Athletics Federation (FCA) and the RFEA. The route is properly marked and signposted every 500 meters. Participants are responsible for knowing the route and race information, as well as any last-minute changes.
The organization guarantees gender equality as a fundamental principle. Generic masculine terms used in this regulation also apply to the feminine, unless explicitly stated otherwise.
Sustainable water stations provided by Aigües de Barcelona will be located at kilometer 6 and after the finish line. Drinks will be served in compostable cups, which must be disposed of in the designated bins. The post-race refreshment area will have two segments: hydration with compostable cups (water and Aquarius) and fruit from Ametller Origen. Participants’ collaboration is requested to ensure proper waste sorting and minimize environmental impact.
The race will close at 7:05 p.m., meaning participants will have at least one hour and thirty minutes to complete it.
A timing chip is mandatory. Incorrect use or failure to attach it to the shoe will result in exclusion from the official results with no right to appeal. Participants without a personal chip (yellow chip) must purchase a single-use white chip for €2, provided with the bib and to be returned at the finish line.
If a participant cannot attend, the registration fee will not be refunded for reasons beyond the organization’s control. Registrations will close when reaching 13,000 participants. The organization reserves the right to extend the number of entries or the registration period for any participant group.
The organization may modify the schedule or route due to external causes or force majeure, with no right to claim.
Starting corrals are divided by color according to the participant’s best official 10 km time within the last two years in chipgroc races. Access to each corral is restricted to participants wearing the corresponding bib or wristband color. Those without an accredited time from an official race may provide proof at bib collection (from the last 24 months). Downhill races or similar are not valid. Participants without an accredited time will start from the white corral (last wave).
The wheelchair category will start at 5:14 p.m. The rest of the starts will be staggered in four waves: 1st at 5:15 p.m., 2nd at 5:21 p.m., 3rd at 5:28 p.m., and 4th at 5:35 p.m. Category results will be based on net time.
Only vehicles accredited and expressly authorized by the organization may follow the race.
Bib and chip collection must be done on the dates and times set by the organization. More information is available on the website.
Failure to collect the bib, T-shirt, and gift bag during the assigned days implies the participant’s withdrawal from the race, with no refund of the fee or materials. The organization reserves the right to request the original ID or passport if it suspects fraudulent documentation. False documents will result in disqualification. Bib and chip collection times must be chosen during registration and respected.
Running with the bib visibly attached to the front of the chest is mandatory. Bibs worn on the back or legs are not valid. Staff will prevent the start or finish of participants without a bib.
Registration is personal and non-transferable and implies acceptance of these regulations. Participation cannot be transferred to another person. Runners using another’s bib and/or chip will have their results annulled and may be banned from future editions.
A cloakroom service will be available at two points depending on the bib number: one at Escola Grèvol and another nearby. The organization is not responsible for deposited items. Bags must be used, and the service must be reserved during registration.
Participation is under each athlete’s responsibility and risk. The organization is not liable for any damages caused by participants to themselves or others. Wheelchairs and athletic carts are allowed, but not handbikes, skates, bicycles, tricycles, or electric wheelchairs.
Visually impaired participants must be properly identified, as well as their guide. To be included in the results and awards, a copy of the disability certificate must be sent to nassos@lasansi.com. Guides must also provide their full name, ID, date of birth, phone, and email.
Trophies will be awarded to the top three male and female finishers at 6:15 p.m. in the podium area. Category trophies (overall, visual impairment, wheelchair, etc.) will also be awarded. For visual impairment and wheelchair categories, a minimum of three finishers is required. Awards not collected will be considered forfeited. Categories are exclusive: a participant cannot win in two categories.
Participants explicitly authorize the publication of their name, surname, gender, and year of birth in the registration and results lists, in accordance with data protection regulations.
Only clubs or associations authorized via email at nassos@lasansi.com may set up tents or similar structures in the start/finish area. Unauthorized setups may be fined by the local police.
By participating, athletes consent to the organization and its partners (including FCA) using images and personal data for promotional or sporting purposes, in compliance with Spain’s data protection law (Organic Law 15/1999). Participants may request correction or deletion of their data by writing to nassos@lasansi.com.
Claims must be submitted within 30 minutes of finishing the race along with a €60 deposit. If the claim is upheld, the deposit will be refunded; otherwise, it will be donated to the race’s charity cause. The organization’s decision is final.
T-shirt size selected during registration cannot be changed. If your preferred size is unavailable, the chosen one will be delivered. Participants may wear any shirt as long as it does not display symbols inciting violence.
Medical assistance will be available at the start, finish, and along the route, including a field hospital and ambulances. Participants authorize medical staff or organization members to provide necessary care. If deemed unfit to continue, participants may be withdrawn by the organization.
Age categories (classification only, no trophies): M/F Absolute, Sub23 (born 2003 or later), Senior (1985–2002), Master 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90+.
There will be no cash prizes.
The organization will not register Spanish athletes with a federation grant or foreign athletes who have achieved a score of 950 WA points or higher in the last two years. The organization is not responsible for any resulting disqualification or appeal.
The Cursa dels Nassos is a charity event. Participants may donate during registration to the A. Bosch Foundation for pediatric cancer research at Vall d’Hebron Hospital in Barcelona.
Refund policy: Registration fees are non-refundable except in the event of race cancellation. Errors in purchase or failure to attend do not justify refunds or modifications.
Registration implies full acceptance of these regulations. Any unforeseen issues will be resolved by the organization, whose decision is final.
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