One Design · Keelboat

Micro Class parts, rigging and specifications

Also known as: Micro Cupper, Micro 5.50, Microtoner, Micro Cup

The Micro Class is a keelboat one-design class. MAURIPRO lists 16 parts for the Micro Class below, grouped by system, with live prices and stock.

Keelboat
16 parts
8 published figures

Your Micro Class at MAURIPRO

What you can do on this page.

01Shop parts by system16 parts for the Micro Class, matched by part number and grouped by system.Shop all parts →

02Check the specifications8 published figures, each with its source.See specifications →

03Get expert helpNot sure a part fits your Micro Class? Send us your sail number and year.Contact us →

Micro Class parts

Prices and stock are live from our catalogue.

Harken Block - 16mm Single - Forkhead
Harken · SKU HAR376 · On Harken layout: Mainsheet
Harken Cam Cleat - Cam-Matic (Micro) 468 - Line: 5/64 to 1/4 in (2 to 6 mm)
Harken · SKU HAR468 · On Harken layout: Mainsheet
Harken Block - Carbo 29mm Single - Cheek
Harken · SKU HAR350 · On Harken layout: Mainsheet
Harken Cam Cleat - Cam-Matic 150 - Line: 1/8 to 1/2 in (3 to 12 mm)
Harken · SKU HAR150 · On Harken layout: Mainsheet
Harken Block - Carbo 29mm Single - Stand-Up - Fixed Head
Harken · SKU HAR349 · On Harken layout: Mainsheet
Harken Swivel Cam Cleat - Base (Standard) w/ Cam-Matic 150 - Line: 1/8 to 1/2 in (3 to 12 mm)
Harken · SKU HAR144 · On Harken layout: Mainsheet
Harken Block - Carbo 29mm Single - Swivel
Harken · SKU HAR340 · On Harken layout: Mainsheet
Harken Block - Carbo 40mm Single - 90&deg Fixed Head
Harken · SKU HAR2659 · On Harken layout: Mainsheet
Harken Block - Carbo 40mm Single - Fiddle
Harken · SKU HAR2655 · On Harken layout: Mainsheet
Harken Block - Carbo 40mm Single - Fiddle - Becket
Harken · SKU HAR2656 · On Harken layout: Mainsheet
Harken Block - Carbo 40mm Single - Fixed Head
Harken · SKU HAR2650 · On Harken layout: Mainsheet
Harken Block - Carbo 57mm Single - Swivel
Harken · SKU HAR2600 · On Harken layout: Mainsheet
Harken Block - Carbo T2 29mm Single
Harken · SKU HAR2146 · On Harken layout: Mainsheet
Harken Block - Carbo T2 40mm Single
Harken · SKU HAR2149 · On Harken layout: Mainsheet
Harken Block - Fly Block 18mm Single
Harken · SKU HAR2698 · On Harken layout: Mainsheet
Harken Low Friction Ring - 10mm
Harken · SKU HAR3270 · On Harken layout: Mainsheet

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

Micro Class specifications

Specification	Published figure	Source
Length overall (LOA)Box-rule maximum, hull length measured 0,70 m above waterline,…	The Hull Length measured at 0,70 metre above the waterline shall not exceed 5,50 metres	International Micro Cupper Class Association (IMCCA), Class Rules of the Micro Class, applicable from 22 May 2023, 4.2.1 Hull Dimensions
BeamBox-rule maximum	The Maximum Beam including plates, rubbing strakes or similar protections shall not exceed 2,45 metres. (8 ft)	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, 4.5.1 Maximum Beam
DraftBox-rule maximum	The Maximum Draft shall not exceed 1,10 metre in Measurement trim. (3 ft 7 in)	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, 4.5.4 Maximum Draft
Upwind sail areaBox-rule maximum, main + headsail	The Maximum Sail Area upwind (Mainsail and Headsail) shall not exceed 18,50 square metres. (199 sq ft)	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, Section 5 Sails
Spinnaker / gennaker areaMaximum spinnaker area	SMS shall not be greater than 19,60 square metres. (211 sq ft)	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, 5.4.7 Spinnaker
Mast lengthDivision maximums	Maximum Mast Length — Racer 8,20 metres / Cruiser 7,70 metres	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, Appendix A1.04 (Divisions table)
CrewRule 3.3 allows reduction to two members under conditions	Crew number is three.	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, 3.3.1 Crew number
RigRotating masts and double-luffed sails prohibited	Only single-masted Boats are allowed.	IMCCA, Class Rules of the Micro Class, applicable from 22 May 2023, Section 5

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

Micro Class class rules and references

Class rules: Class Rules of the Micro Class, applicable from 22 May 2023 (IMCCA; previous edition 2015-2018 applicable from 25.05.2016)
Class association: micro-class.org
Builder: windyacht.pl

References checked 2026-11-04.

Micro Class buying questions

What Micro Class parts does MAURIPRO carry?

16 products are listed for the Micro Class on this page: blocks & sheaves (13); cleats, clutches & fairleads (3). Prices and availability shown are live from our catalogue.

How do I know a part fits my Micro Class?

Each part here is linked to the Micro Class because its exact manufacturer part number appears on the Micro Class 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.

Which rules govern the Micro Class?

The class is governed by its class rules (Class Rules of the Micro Class, applicable from 22 May 2023 (IMCCA; previous edition 2015-2018 applicable from 25.05.2016)). Check the current edition with the class association before buying parts for racing.

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