Enduro Bearings 2437 LLB (BB90) ABEC 3 Bearing - 24x37.1x7mm

ABEC 3 radial bearing with 24 mm inner diameter, 37 mm outer diameter, 7 mm thickness and double-lip type sealing with light contact, making a labyrinth seal.

OS bearing for some Trek BB90/95

Features

LLB Type Seals -Enduro'smost popular seal type, this is a Nitrile material rubber with a steel insert. Rather than the standard 2RS type seal, Endurogo a step further by machining a groove into the inner race where the seal can rotate with better efficiency and less rolling resistance. Rather than one thick seal lip rubbing on a blunt surface, LLB type utilizes two razor thin sealing lips riding in the groove with light contact. The outside lip keeps the water and contaminates out, while the inner seal retains the grease for smooth function and long intervals between servicing.

ABEC 3 -Thesebearings use grade 10 Chromium Steel Balls and 52100 High Carbon Chromium Alloy Races,The high precision balls are within 10/1.000.000? round, twice as round as the industry standard, at it's highest level. The alloy races are made from a vacuum de-gassed process for the purest chromium alloy steel, hardened to R-62, extremely tough and very durable.Polished to a mirror finish for ABEC-3 precision and noiseless movement.The riveted Steel Retainer stands for toughness, ABEC-3 tolerances and noise tested.

C-3 Clearance, this specification describes the internal clearance between the bearing and its race. For example, in a 10-18 I.D. bearing, Enduro's standard is 11-21 micrometers where as others use 11-25 micrometers.