RK 525KRO O-RING Motorcycle Drive Chain
The RK 525KRO O-RING Chain is an economical, sealed motorcycle drive chain designed for everyday street riding. Manufactured by RK Japan, the KRO series combines durable high-carbon alloy steel construction with O-ring sealing technology to help retain lubrication, protect internal components and provide dependable performance for regular road use.
An excellent option for riders looking for a practical replacement motorcycle chain, the RK 525KRO balances durability, smooth power transmission and value for money.
O-Ring Sealing for Reduced Wear
The 525KRO uses nitrile butadiene rubber (NBR) O-rings between the chain plates to help retain lubricant around the pin and bush assemblies while limiting the entry of dirt and moisture. This sealed design helps reduce internal wear and supports longer service life compared with a conventional non-sealed chain, provided the chain is maintained correctly.
Durable High-Carbon Alloy Steel Construction
RK manufactures its O-ring chains using high-carbon alloy steel to provide strength and durability under normal riding loads. The chain is designed for consistent power transmission and everyday street use, making it suitable for compatible mid-capacity motorcycles within the manufacturer's specified application limits.
Designed for Everyday Street Riding
The RK KRO series is positioned as an economical O-ring chain range for general street riding and daily use. Its sealed construction helps protect the internal lubrication, while routine cleaning, lubrication and correct adjustment remain important for maximising service life.
RK 525KRO Chain Specifications
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Brand: RK Japan
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Series: KRO
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Chain size: 525
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Seal type: O-ring
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Tensile strength: 38.3 kN
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Manufacturer-listed application: 400cc–800cc
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Maximum power rating: Up to 130 HP, as listed by RK Europe
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Connecting link: Rivet-type master link
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Weight: Approximately 1.96 kg per 100 links
Important fitment information: Engine capacity alone does not determine chain compatibility. Before ordering, confirm the required chain size, link count, master-link type and application suitability against your motorcycle manufacturer's specifications. Rivet-type connecting links require the correct riveting tool and proper installation.
Choose the RK 525KRO for an affordable, sealed motorcycle drive chain from an established Japanese chain manufacturer.