MR314357-2RS Bottom Bracket Bearing – 31 x 43.5 x 7 mm

The EasyBikeParts MR314357-2RS is a high-quality sealed chromium steel bearing, designed for smooth performance and durability. Built to the non-standard 31 x 43.5 x 7 mm bottom bracket size, this bearing delivers reliable operation and excellent protection against dirt, moisture, and wear — ideal for high-performance cycling applications.

Key Features:

• Sealed Design (2RS) – Double rubber seals provide superior protection against dust, dirt, and water, ensuring long-lasting performance.
• Durable Construction – GCR15 chromium steel races and balls give excellent hardness, strength, and resistance to wear under heavy pedalling loads.
• Smooth Rotation – Precision-engineered and packed with SINOPEC HTHS high-temperature, high-shear grease to reduce friction and extend component lifespan.
• Direct Replacement – A straight swap for worn bottom bracket bearings requiring the 31 x 43.5 x 7 mm size.

Specifications:

• Bearing Type: MR314357-2RS
• Dimensions: 31 x 43.5 x 7 mm (31 mm ID / 43.5 mm OD / 7 mm width)
• Material: Chromium Steel GCR15 (races and balls)
• Grease: SINOPEC HTHS bearing grease or equivalent
• Seals: 2RS (double rubber seals for added protection)
• Application: Bottom bracket

Two things you may want to add before publishing. First, the previous two listings both named a specific system (Praxis, Look BB65) — buyers searching this odd 31 mm bore will almost certainly be searching by frame or BB brand, so naming the systems it fits would help it get found. Second, if the 43.5 mm OD is a nominal figure rather than measured, worth confirming, since half-millimetre outer diameters are easy to mis-transcribe and the wrong OD is the one dimension that will not press in.