SKU: kingMB7776S

King Bearings BMW N55B30A/N53B30A/N52B30A Main Bearing Set MB7776S

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BMW STD Main Bearing Set - King MB7776SI

Improve your engine's performance and replace old worn out OEM bearings with these long-lasting, high-quality Main Crankshaft Bearings by King Engine Bearings. Main crankshaft bearings hold your crankshaft in place, preventing it from being dislodged by forces from the pistons, and instead converting the reciprocating movement into rotation. King Connecting Rod Bearing Sets are constructed from various high-quality alloys, crafted carefully by a highly qualified team of professionals who are highly experienced in the Industry.


  • Only superior materials are used in King's bearings

  • Innovative production technology ensures a perfect fit

  • Advanced R&D software and analysis expertise

  • Crafted by experienced engineers and an advanced technical team


  • Crankshaft - 0.000/0.000

  • Housing - 0.000/61.036 | 0.000/70.053

  • Max Wall - 2.499

  • Max Length - 18.801 | 19.799 | 22.400


King Engine Bearings was founded in 1960 with one objective: to supply the highest quality bearings available in the marketplace.

By specializing in engine bearings, King has built an extensive product offering that includes a wide range of engine bearings for automobiles, light-duty and heavy-duty trucks, marine, aviation, standby power and many other types of internal combustion engines. Every King bearing utilizes the highest quality materials and the most advanced designs to ensure complete customer satisfaction.

From concept to final product, everything is done under one roof. This allows King to produce bearings more efficiently and with more accuracy in order to keep up with the needs of our customers. During production, all bearings must pass rigorous quality control checkpoints throughout the entire process. This stringent system of multiple quality checks ensures that only the highest quality bearings ever make it into our customers’ hands.

We have a 20-day return policy, which means you have 20 days after receiving your item(s) to request a return. Please note we charge a 25% restocking fee on all returns. To be eligible for a return, your item must be in the same original/new condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. To start a return, you can contact us at Items sent back to us without first requesting a return will not be accepted. You can always contact us for any return question at Please inspect your order upon arrival, and contact us immediately if the item is defective, damaged or if you received the wrong item, so that we can evaluate the issue and make it right.

Exceptions/non-returnable items:

Certain items cannot be returned, like sale items, perishable goods, custom products (such as special orders or personalized items), hazardous materials, flammable liquids, and/or gases. Please get in touch if you have questions or concerns about your specific item. Unfortunately, we cannot accept returns on sale items or gift cards.


The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.


We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember, it can take some time for your bank or credit card company to process and post the refund.