DESCRIPTION

CYCLINGCERAMIC ball bearing 6903 | 61903 Founded in 2012 by French cyclist Héloise Proust, Cyclingceramic is committed to ensuring that every watt you put on the pedals is converted into propulsion. At their company headquarters in France, they manufacture high-quality ceramic ball bearings for a wide range of bike components by hand. The company relies on sourcing all compfrom European suppliers. In addition to individual ball bearings, the French also produce a large selection of oversized derailleur cages, derailleur pulleys and bottom brackets to help you improve your performance on the bike. Convinced of the high quality of their products, Cyclingceramic gives you a 4-year guarantee on their bearings.

The ceramic balls used by Cyclingceramic are made from high-quality grade 3 silicon nitride. Compared to conventional steel balls, they are 58% lighter, 12% harder and 68% stiffer. In addition, the roundness is 75% higher. The outstanding properties of the ceramic balls not only reduce frictional resistance to a minimum, they also make the bearings more durable. At Cyclingceramic, each ball is precisely inserted by hand into the hardened steel raceways manufactured in Switzerland. The balls are held in place by lightweight, corrosion-resistant polyamide cages. The non-contact seals reduce frictional resistance and still protect the bearings against the ingress of dirt and moisture. During the production process, each bearing is checked several times to ensure that all components fit perfectly.

TECHNICAL DATA

Material: Steel bearing rings with ceramic balls
Bearing type: Deep groove ball bearing 61903/6903
Dimension IØxAØxW: 17x30x7 mm
Seal: double-sided contactless seal
Design: handmade Grade 3 ceramic bearing
Color: silver

Weight according to manufacturer: 13.8g
Weight self-weighed: 14g