Enduro Bearings MR 21531 2RS – 21.5x31x7

Identification Key:

MAX – Max suspension pivot bearing. Designed specifically for suspension pivots.

2RS – 2 Rubber Seals.
LLB – Medium Contact Seal. Well suited for Hubs
LLU – Full Contact Seal. Better for suspension pivots
VV – Light Contact Seal
SRS – Snap Ring Seal
LLU/LLB – Dual Seal Bearing (One seal type per bearing side)

BO – Black Oxide Treatment. Corrosion resistant coating

(6)801 – 6 Single Row Bearing
6(3)801 – 3 Wide Single Row Bearing
(3)801 – 3 Double Row Bearing
6(1)801 – 1 ABEC-5 Bearing
(7)1801 – 7 Angular Contact Bearing. Specifically designed for hubs
(S)6801 – S Stainless steel bearing

MR – Metric Roller
MRA – Metric Roller Angular Contact. Specifically designed for hubs
SMR – Stainless Steel Metric Roller
SMRA – Stainless Steel Metric Roller Angular Contact

DR – Double Row

A5 – ABEC-5 Bearing

CH – Ceramic Hybrid. ABEC-5 tolerance, LLB Seals, Graphite Nylon retainer.
CO – Ceramic Zero. Comes close to magic ″zero″ rolling resistance number.
CXD – XD-15 Ceramic. Longest lasting, speediest ceramic bearing available

E – Extended Inner Race
EE – Double Extended Inner Race (extends on both sides)
F – Flanged Bearing
FE – Flanged Extended Inner Race
FO – Flanged Offset Bearing

1Z – Singe-side Grease Shield
ZZ – Dual Side Grease Shield