The MR 20307 LLB - ABEC 3 bearing by Enduro Bearings is the entry standard for high-quality bearings. These ABEC 3 bearings are an upgrade from the ABEC 1 bearings that are commonly found on original equipment (OE) bicycles. Enduro Bearings is known for providing only the finest cycling components, and their ABEC 3 bearings are no exception. Featuring hardened chromium steel races, balls, and tough riveted steel retainers, these bearings are built to last. They offer improved quality and performance, making them the perfect low-cost performance upgrade for your bicycle. The MR 20307 bearing has dimensions of 20x30x7mm, with an ABEC grade of 3 and a seal type of LLB. It is lubricated with Mobile HP 222 grease, and is suitable for use in hubs and bottom brackets. Weighing only 14.10g, this bearing is lightweight and will not add unnecessary weight to your bike. Upgrade your bike's performance and durability with the MR 20307 LLB - ABEC 3 bearing by Enduro Bearings.