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One Design · Keelboat

Ultimate 20 parts, rigging and specifications

Also known as: U20

The Ultimate 20 is a keelboat one-design class, with a published length overall of 20 ft 10 in (6.35 m). MAURIPRO lists 29 parts for the Ultimate 20 below, grouped by system, with live prices and stock.

  • Keelboat
  • 29 parts
  • 15 published figures

Your Ultimate 20 at MAURIPRO

What you can do on this page.

01Shop parts by system29 parts for the Ultimate 20, matched by part number and grouped by system.Shop all parts →
02Check the specifications15 published figures, each with its source.See specifications →
03Halyards & sheets made for it20 lines made up to this boat's lengths.Shop halyards & sheets →
04Get expert helpNot sure a part fits your Ultimate 20? Send us your sail number and year.Contact us →

Shop Ultimate 20 by system

Ultimate 20 parts

Prices and stock are live from our catalogue.

Harken part numbers cross-checked against Harken's published one-design deck layout for the Ultimate 20 (checked 2026-11-04).

Ultimate 20 specifications

SpecificationPublished figureSource
Length overall (LOA)LOA: 20 feet, 10 inchesUltimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section (fetched 2026-11-10)
Waterline length (LWL)LWL: 18 feet (5.49 m)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section; matches Harken one-design deck layout page, Compiled from published sources (newportbeach.ullmansails.com, irp.cdn-website.com, doyleboston.com), MAURIPRO Sailboat Data
BeamBeam: 8 feet, 6 inchesUltimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section; matches MAURIPRO Sailboat Data
Draft, board/keel downDraft - keel down: 5 feet (1.52 m)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section
Draft, board/keel upKeel upDraft - keel up: 9 inches (0.23 m)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section
Hull weightClass minimum dry boat weight inclThe dry weight of the boat shall not be less than 1100 lbs. (499 kg)Rules of the Ultimate 20 Class Association, effective October 19, 2025, One-Design rules, 2. Weight
Sailing weight (all up)Class minimum ready-to-race weight inclThe total weight of the boat, ready to race, shall not be less than 1210 lbs. (549 kg)Rules of the Ultimate 20 Class Association, effective October 19, 2025, One-Design rules, 2. Weight
DisplacementNominal displacementDisplacement: 1,260 pounds (572 kg)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section
BallastBallast: 450 pounds (204 kg)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section; matches Harken one-design deck layout page, Compiled from published sources (newportbeach.ullmansails.com, irp.cdn-website.com, doyleboston.com), MAURIPRO Sailboat Data
Mainsail areaMainsail: 205 square feet (19.0 m²)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section; matches Harken one-design deck layout page, Compiled from published sources (newportbeach.ullmansails.com, irp.cdn-website.com, doyleboston.com)
Jib areaJib: 100 square feet (9.3 m²)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section; matches Harken one-design deck layout page, Compiled from published sources (newportbeach.ullmansails.com, irp.cdn-website.com, doyleboston.com)
Spinnaker / gennaker areaClass spinnakerClass Spinnaker: 452 square feet (42.0 m²)Ultimate 20 Class Association, u20class.org homepage 'SPECS: Ultimate 20' section
CrewThe minimum total persons on board during racing shall be two.Rules of the Ultimate 20 Class Association, effective October 19, 2025, OD rules - Crew 3
DesignerVerify exact wording on the pageDesign collaboration headed by Jeff Canepa, which included Jim Antrim of Antrim Associates-Naval Architects, sailmaker and Olympic medalist Jay Glaser, and 505 builder…Ultimate 20 Class Association, u20class.org homepage (fetched 2026-11-10)
BuilderNo active builder in North America (originally Ultimate Sailboats; later Abbott Boats, Columbia Yachts, Moore Sailboats, Santa Cruz Yachts, W. D. Schock Corp per Wikipedia)Compiled from published sources (newportbeach.ullmansails.com, irp.cdn-website.com, doyleboston.com); matches MAURIPRO Sailboat Data

Figures are shown as each source publishes them, with the other unit converted. Class rules set the measurements that count for racing.

More for the Ultimate 20

Ultimate 20 tuning guides

  • Ullman Sails: Ultimate 20 Tuning GuideVersion 2024 · 1 page
  • Doyle Boston Sailmakers: Ultimate 20 Tuning Guide6 pages

Tuning guides belong to the sailmakers that publish them. MAURIPRO does not host or reproduce them; ask the sailmaker or your class association for a copy.

Ultimate 20 class rules and references

  • Class rules: Rules of the Ultimate 20 Class Association, effective October 19, 2025 (document dated October 15, 2025)
  • Class association: u20class.org

References checked 2026-11-04.

Ultimate 20 buying questions

What Ultimate 20 parts does MAURIPRO carry?

29 products are listed for the Ultimate 20 on this page: halyards, sheets & control lines (16); blocks & sheaves (8); cleats, clutches & fairleads (2); travelers, tracks & cars (1); covers & bags (1); other parts (1). Prices and availability shown are live from our catalogue.

How do I know a part fits my Ultimate 20?

Each part here is linked to the Ultimate 20 because its exact manufacturer part number appears on the Ultimate 20 parts lists we reviewed (including Harken's published one-design deck layout for this class). Fit can still depend on your boat's year, builder and rig, so check the product details and your class rules, or ask our technical team before you order.

Where can I find the Ultimate 20 rig dimensions?

Our Ultimate 20 Sailboat Data page lists the rig dimensions (I, J, P, E) and other published data we hold for this boat. Figures there come from a sailboat database and may differ from class measurement rules.

Can I order halyards and sheets made for the Ultimate 20?

Yes. Our Ultimate 20 - Halyards & Sheets page lists 20 halyard and sheet options made up for this boat.

Are there tuning guides for the Ultimate 20?

Sailmakers have published tuning guides for this class, including Ullman Sails (Ultimate 20 Tuning Guide, PDF dated 07/16/2024 (by class specialist Steve Shaw; same numbers as the '2022 Forward' guide hosted by the class association)); Doyle Boston Sailmakers (Ultimate 20 Tuning Guide, Undated PDF by Brad Boston (written after winning the two preceding North American Championships); linked from the class association site). These guides belong to their publishers; MAURIPRO does not host or reproduce them, so please get them from the sailmaker or your class association.

Which rules govern the Ultimate 20?

The class is governed by its class rules (Rules of the Ultimate 20 Class Association, effective October 19, 2025 (document dated October 15, 2025)). Check the current edition with the class association before buying parts for racing.

Not sure which part fits your Ultimate 20?Send us your sail number, year and builder and our team will check it.
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