Our complete stock of hubs, rims and spokes allow us to build and ship your wheelset in just 2 days.
Bikeonline's custom wheels are handbuilt by experienced hands following your needs. Every single step of wheelbuilding is supported by the best tools available, as P&K Lie wheel stand with decimal precision, Pillar spoke tension metre and special handtools, often built by our own to reach our needs for precision.
The use of the best parts on the market, the highly skilled labor force and years of experience has meant that Bikeonline become the reference for wheelbuilding service for prestigious Italian brands that refer to us to have a high level service, effective, fast and precise.
|DIMENSIONS||15 x 21 x 4 mm|
|BALL GRADE||3 US Made Silicon Nitride ceramic|
|RACES||Cryogenically Treated Chromium Steel|
|SEALS||"VV" Dual-lip non-contact|
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The ZERØ Ceramic ABEC 5 bearings have ceramic balls and steel races.
Silicon Nitride Ceramic Si3N4 balls are made from pure Silicon Nitride material with extreme high density from uniform compaction, the micro-structural development of this material during manufacturing is second to none. These high precision grade 5, Si3n4 pure ceramic balls are 5/1,000,000″ from exactly round in sphericity, 60% lighter weight, and 7 times harder than steel.
The balls are Grade 3, Silicon Nitride (Si3n4). These are the roundest balls you can buy without a military license.
52100 High carbon Chromium Alloy Races with Cryogenic Treatment:
Cryogenic treatment takes the races down to minus three hundred degree Fahrenheit to normalize the crystalline structure of the material so the races will resist the hardness of the ceramic balls and get the maximum wear potential.
The races are treated with a black oxide coating, which helps prevent rusting in the bearing. The races are then reground to a mirror finish after this treatment. Finally, they are cryogenically treated for strength before assembly.
We use Silicone VV seals, which is the lightest drag seal available on the market. VV Seals: two NBR 70 rubber seals with non-contact type seal, which rides in a matching groove machined into the bearing.