Home mechanics and workshops replacing a worn 6003 bearing with a quality, bike-specific part.
The Enduro 6003 LLB is a standard radial cartridge bearing measuring 17 x 35 x 10 mm. Enduro lists it as a bottom bracket bearing for older square-taper bottom brackets, and it's also used as a suspension pivot bearing, though Enduro's MAX version is better suited to pivots.
It pairs 52100 high-carbon chromium steel races with Grade 10 steel balls, made to ABEC-3 precision with C3 clearance. LLB dual-lip labyrinth seals and a 90% grease fill keep it running smoothly through rain and grime.
It's sold as one bearing. Check how many your part uses and replace them together for the best result.
Standard 6003 size
17 x 35 x 10 mm radial cartridge bearing.
Common BB size
Used in many older square-taper bottom brackets.
Labyrinth sealed
LLB dual-lip seals keep grit and water out.
Packed with grease
90% fill of high-pressure waterproof grease.
Bearing
In the box
LLB seals
Dual-lip seals ride in a micro-groove in the race to form a full labyrinth, keeping water and grit out and grease in.
Deep-groove races
Enduro cuts its races as deep as possible to fit the largest balls, which spreads load and helps the bearing last.
Great for
Maybe not for
Fits anything that takes a 6003 bearing: 17 mm bore, 35 mm outside diameter, 10 mm wide. Check the number on your old bearing's seal. Sold individually.
Press, don't hammer
Use a bearing press or a drift that pushes on the race you're pressing into the part, never on the seal. A hammer can damage a new bearing before it's turned a single kilometre. If you don't have the tools, bring it in and we'll fit it.
Match the number, not just the look
Bearings of similar size can look identical. Read the code on the old seal or measure bore, outside diameter and width before ordering, and bring the old one in if you're unsure.
Enduro makes bicycle bearings in high-carbon chromium steel, 440C stainless steel, ceramic hybrid and XD15, and engineers them with the deepest possible grooved races and dual-lip labyrinth seals for protection against the elements.
