Some Treks with bb90 bottom bracket have a 37.1mm bore, these are to take up the .1mm difference.
Grade 10 Chromium Steel Balls:
High precision balls are within 10/1,000,000″ round, twice as round as the industry standard, at it’s highest level.
52100 High Carbon Chromium Alloy Races:
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.
Riveted Steel Retainer for toughness, ABEC-3 tolerances and noise tested, C-3 or C-N Internal Clearance
Dimensions (IDxODxD): 24 x 37.1 x 7
Bearing Internal Dimension: 24
Bearing Outer (External) Dimension: 37.1
Bearing Depth: 7
Bearing Depth Including Extended Inner Race:
Races & Balls Material: Grade 10 Chromium Steel Balls, 52100 High Carbon Chromium Alloy Races
Cage Material: Graphite/Nylon Ball Retainers
Seals: LLB - Low Contact Seal
Grease: Mobil XHP-222
ABEC Rating: 3
Used on: Trek BB90 with the fractionally bigger Bottom Bracket 37.1mm
If you would like to return an item you have purchased from us please contact us on 0113 256 5676 or firstname.lastname@example.org or Aire Bearings Ltd, 34 Bradford Road, Stanningley, Leeds, LS28 6DD.