Motorcycle Drive Chain | 25 to 530H Series – Standard, Heavy & O-Ring

Motorcycle Drive Chain (1)

Korea Ever-Power motorcycle chains cover every grade from lightweight 420-series commuter chains (1,850 kgf breaking load) to heavy-duty 530H units rated at 3,300 kgf — giving your drivetrain exactly the strength it actually needs, nothing more, nothing less. Standard roller, O-ring, and X-ring sealed variants are stocked, with full dimensional compliance to JIS B 1801 motorcycle chain standards.

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Motorcycle Drive Chain — Series 25 to 530H

A motorcycle drive chain is the mechanical link between the engine output sprocket and the rear wheel sprocket, converting engine torque into forward motion with minimal power loss. Unlike belt or shaft final drives, a well-maintained roller chain delivers near-zero drivetrain friction — which is why it remains the standard choice for sport bikes, motocross machines, and the majority of street motorcycles produced today.

Korea Ever-Power Chain and Sprocket Co., Ltd. manufactures the complete motorcycle chain range — from light 25-series chains for small-displacement engines to 530H reinforced units for high-torque liter-class bikes and enduro competition. All chains are dimensionally manufactured to JIS B 1801 standards, making them direct-fit replacements for Tsubaki, DID, RK, and EK equivalent grades.

 

  • ⚙Pitch range: 6.35 mm (25-series) — 15.875 mm (530-series)
  • ⚙Breaking load: 450 kgf (25 standard) up to 3,300 kgf (530H)
  • ⚙Types: standard, heavy-duty (H), super heavy-duty (SH), O-ring, X-ring
  • ⚙Suitable for motorcycles from 50 cc scooters to 1,400 cc superbikes

Motorcycle Drive Chain (1)

Full Dimensional Specifications

The table below lists complete dimensional data for all standard and heavy-duty motorcycle chain grades. Key columns include pitch, roller diameter (R), inner-link plate heights (H1/H2), plate thickness (T/T2), pin diameter (D), pin assembly lengths (F/G), average ultimate tensile strength (kgf), and approximate weight per metre. Confirm all dimensions against your motorcycle's service manual before ordering — pin diameter and inner width are the two measurements most commonly mismatched during chain substitution.

Motorcycle Drive Chain Demension

Chain No. Pitch × Width R
(mm)		 H1
(mm)		 H2
(mm)		 T
(mm)		 T2
(mm)		 Pin D
(mm)		 F
(mm)		 G
(mm)		 Breaking
Load (kgf)		 Weight
(kg/m)
inch mm
25 1/4″×1/8″ 6.35×3.18 3.30 5.00 5.80 0.75 0.75 2.30 3.80 4.80 450 0.14
25-2 1/4″×1/8″ 6.35×3.18 3.30 5.00 5.80 0.75 0.75 2.30 7.03 8.02 900 0.26
25H 1/4″×1/8″ 6.35×3.18 3.30 5.00 5.80 1.00 1.00 2.30 4.50 5.10 560 0.16
415S 1/2″×5/16″ 12.70×7.76 7.77 8.55 9.70 1.00 1.00 3.62 5.50 6.70 920 0.33
415H 1/2″×5/16″ 12.70×7.76 7.77 10.20 11.80 1.50 1.50 3.96 6.40 7.80 1850 0.50
420 1/2″×1/4″ 12.70×6.35 7.77 10.20 11.80 1.50 1.50 3.96 7.50 8.40 1850 0.58
420H 1/2″×1/4″ 12.70×6.35 7.77 10.20 11.80 1.50 1.50 3.96 8.10 8.95 1900 0.65
425 1/2″×5/16″ 12.70×7.94 7.92 10.20 11.80 1.80 1.80 3.96 8.20 9.35 1850 0.58
428 1/2″×5/16″ 12.70×7.94 8.50 11.20 11.90 1.50 1.50 4.44 8.25 9.40 1900 0.68
428H 1/2″×5/16″ 12.70×7.94 8.50 11.20 12.20 1.80 1.80 4.44 8.90 10.20 2300 0.79
428SH 1/2″×5/16″ 12.70×7.94 8.50 11.20 12.20 2.00 2.00 4.44 9.30 10.70 2400 0.85
520 5/8″×1/4″ 15.875×6.35 10.16 13.00 14.80 2.00 2.00 5.06 8.50 10.10 3100 0.90
520H 5/8″×1/4″ 15.875×6.35 10.16 13.00 14.80 2.40 2.40 5.06 9.30 10.90 3300 1.00
525 5/8″×5/16″ 15.875×7.94 10.16 13.00 14.80 2.00 2.00 5.06 9.30 10.90 3100 0.97
525H 5/8″×5/16″ 15.875×7.94 10.16 13.00 14.80 2.40 2.40 5.06 10.00 11.60 3100 1.05
530 5/8″×3/8″ 15.875×9.53 10.16 13.00 14.80 2.00 2.00 5.06 10.10 11.60 3100 1.01
530H 5/8″×3/8″ 15.875×9.53 10.16 13.00 14.80 2.40 2.40 5.06 10.90 12.40 3300 1.12

Standard vs. Heavy-Duty vs. O-Ring: Which Grade Do You Need?

Not all motorcycle chains are equal. The three core grades differ in plate thickness, pin size, and whether a sealing element retains grease between the link plates. Choosing the wrong grade is the single most common source of premature chain wear — a 420-standard on a 600 cc sport bike, or an O-ring chain on a muddy enduro course, are both mismatches with predictable consequences.

◆ Standard Grade

420, 428, 520, 525, 530. Thinner side plates (T: 1.50–2.00 mm), standard pin diameters. Light weight, low rolling resistance. Suited to street bikes 50–250 cc and entry-level machines. Requires lubrication every 400–600 km.

420 → 1,850 kgf breaking load

◆ Heavy-Duty (H / SH Grade)

415H, 428H, 428SH, 520H, 525H, 530H. Thicker plates (T2 up to 2.40 mm), larger induction-hardened pins. The 530H delivers 3,300 kgf — 26% above a standard 530. Recommended for 400 cc and above, touring bikes, and motocross.

530H → 3,300 kgf breaking load

◆ O-Ring / X-Ring Sealed

Elastomer seals pre-packed with grease extend lubrication intervals to 3,000–5,000 km. X-ring profiles reduce seal contact area, lowering heat at sustained highway speeds. Ideal for touring; not recommended for aggressive off-road use where sand abrades rubber seals.

Lube interval: up to 5,000 km

Motorcycle Drive Chain 1

Inside a Motorcycle Drive Chain — Component Breakdown

Understanding each component helps you identify wear early and match the replacement grade to your operating conditions. A standard motorcycle chain consists of six elements, each with a defined role in the roller chain power transmission cycle.

roller chain structure 2

🔗 Outer Link Plates

The two flat steel plates on the outside of each link unit carry the tensile load when the chain wraps around the drive sprocket under engine torque. In H-series chains, outer plates are made from higher carbon-content steel and are measurably thicker. A cracked outer plate — visible as a hairline fracture along the plate face — means immediate replacement: the chain is within one stress cycle of a snap-failure.

🔩 Inner Link Plates and Bushings

The inner plates are press-fitted around a cylindrical bushing — the primary wear surface contacting the pin during articulation. In a standard open chain, the bushing is directly exposed to road grit and moisture. In an O-ring or X-ring chain, an elastomer seal sits in a machined groove between inner and outer plates, retaining factory-packed grease and blocking debris ingress. This is exactly why sealed chains outlast unsealed units by a factor of two or more under typical street conditions.

⚙ Rollers

Each bushing carries a free-spinning roller. When the chain engages a motorcycle chain sprocket, the roller converts sliding friction into rolling friction, substantially reducing tooth wear on both components. Roller diameter must match the sprocket tooth profile precisely — a mismatch produces a characteristic clicking under load and asymmetric tooth wear that shortens the life of both parts simultaneously.

📌 Pins

Hardened steel pins pass through the inner bushings and are peened or clip-retained by the outer plates. In SH-grade chains, pins are induction-hardened alloy steel. The pin diameter (D) listed in the specification table is held to ±0.01 mm on precision grades, ensuring correct bushing clearance for smooth articulation without excess lateral play.

Maintenance, Lubrication, and Wear Inspection

A well-maintained standard chain on a 250 cc commuter will outlast a neglected heavy-duty chain on a sport bike by a considerable margin. The following schedule is a practical framework — adjust intervals based on riding environment. Wet roads, coastal salt air, and off-road mud all demand more frequent attention.

🛢 Lubrication Schedule

For unsealed standard chains: apply chain lubricant every 400–600 km of road riding, or after any off-road session. Use a spray lubricant specifically formulated for motorcycle drive chains — penetrating oils evaporate quickly and leave insufficient residual film. Apply to the inner side of the chain near the sprocket so centrifugal force carries lubricant into the pin-bushing interface.

For O-ring and X-ring chains: re-lubrication intervals extend to 2,000–4,000 km under normal conditions. Avoid high-pressure jet washing — it can strip external lubricant and damage seal lips. Use a low-pressure rinse or chain cleaning brush with mild degreaser, then reapply lube once dry.

⚖ Tension Adjustment

Correct chain tension is often overlooked. An overly tight chain places excess radial load on the output shaft bearing and rear axle bearing. A loose chain risks skipping teeth or derailing under hard deceleration. Standard free-play for most street motorcycles is 20–30 mm of vertical slack at the midpoint of the lower chain run, measured with the bike on its side stand at static ride height. Verify against your model's service manual — swingarm geometry affects the correct value.

📏 The 3% Elongation Rule — When to Replace

A motorcycle chain stretched more than 3% beyond nominal length needs replacing. To check: lay a ruler against the outer plates and measure 20 complete pitches (40 link pins). For a 428-series chain (12.70 mm pitch), 20 pitches = 254 mm nominal. A reading of 262 mm or above means the threshold is crossed. Continued use accelerates sprocket tooth wear disproportionately. A worn chain destroys a new sprocket within a few thousand kilometres — always inspect front and rear sprockets simultaneously when replacing the chain.

Where These Chains Are Used

🏍 Street & Commuter Bikes

Standard 420, 428, and 520-series chains serve the majority of street motorcycles from 125 cc to 650 cc. For Korean delivery fleets racking up 10,000+ km per year, the cost advantage versus premium Japanese brands makes Korea Ever-Power chains a practical choice without sacrificing dimensional accuracy or link integrity.

🏁 Sport & Superbike

The 520H and 530H grades — with breaking loads of 3,100–3,300 kgf — are sized for high-output engines where rapid acceleration and hard deceleration cycle the chain near its load limits. Many 600 cc and 1,000 cc bikes are converted from 530 to 520-series to shed rotational inertia, noticeably sharpening throttle response.

🏔 Off-Road & Motocross

MX and enduro riding subjects chains to lateral shock loads from jumps and terrain impacts. H-grade thicker plates resist side-flex fatigue that leads to plate cracking off-road. Most competitive motocross riders prefer unsealed H-grade chains — they can be cleaned fully and re-lubricated after each session, whereas O-ring seals are abraded by sand and fine grit.

🗺 Touring & Long-Distance

Touring riders covering 500+ km per day benefit most from sealed X-ring chains. On Korean expressways where sustained highway speed generates significant chain operating temperature, X-ring's reduced seal contact area produces measurably lower heat than a standard O-ring sealed chain, extending service life between stops.

sprocket and chain 2

Korea Ever-Power vs. Premium Brand Motorcycle Chains

The following comparison covers the practical purchasing considerations that matter to fleet managers, dealers, and riders sourcing chains for the Korean market.

Criteria Korea Ever-Power Premium Brand (DID / RK / Tsubaki)
Dimensional standard JIS B 1801 compliant JIS / ISO base standard
Material Carbon / alloy steel, induction-hardened pins Carbon / alloy steel, proprietary heat treatment
Price point 20–40% below premium retail pricing Higher retail price; brand premium included
MOQ to Korea Flexible, low minimum order quantities Typically through distributors; higher thresholds
Lead time 7–15 business days for stocked grades Depends on distributor stock levels
Custom lengths Cut-to-length and bulk reels available Standard retail lengths only, typically
Test documentation CoC and material test reports on request Brand warranty; limited technical documentation

This comparison is provided for customer reference and selection purposes only. Korea Ever-Power Chain and Sprocket Co., Ltd. is an independent manufacturer. We do not produce or sell counterfeit products and claim no affiliation with any brand referenced above. All trademarks belong to their respective owners.

How to Select the Right Motorcycle Chain

A few specific data points are all that is needed to narrow down the correct chain for any motorcycle. The following five-step process is used by experienced workshop mechanics and fleet procurement managers alike:

sprocket and chain 1

  1. Identify the chain number from markings stamped on the outer plate of the existing chain (e.g., 428, 520, 530). If the chain is too worn to read, check your motorcycle's service manual under "Drive Chain Specifications."
  2. Count the links. Count total inner link assemblies or measure the overall chain length and divide by pitch. Standard lengths are 100, 110, or 120 links; cut-to-length and joining links are available for non-standard requirements.
  3. Select the appropriate grade. For engines above 400 cc or any off-road application, use H-grade minimum. For touring above 25,000 km per year, choose O-ring or X-ring to reduce maintenance frequency.
  4. Confirm sprocket condition. A new chain should always be checked against existing sprockets. Hooked or thinned tooth profiles on either sprocket mean both should be replaced alongside the chain.
  5. Check width compatibility if doing a series conversion (e.g., 530 to 520). Sprocket groove width must match the new chain's inner width — a mismatch causes lateral misalignment wear from the first ride.

Matching Sprockets for Your Motorcycle Chain Series

motorcycle chain sprocket front and rear drive sprocket

A drive chain is only as reliable as the sprockets it meshes with. Korea Ever-Power stocks a full range of motorcycle chain sprockets — front countershaft and rear wheel sprockets — machined to match the 420, 428, 520, 525, and 530 chain series listed in the specification table above.

Our sprockets are manufactured from C45 carbon steel with induction-hardened tooth profiles, achieving surface hardness of HRC 50–55. Standard bore and custom-bore options are available. When ordering a complete chain and sprocket system, specify your motorcycle make, model, and whether you want OEM tooth count or a modified gear ratio — our team can calculate the effect on acceleration, top speed, and cruising RPM.

Why Choose Korea Ever-Power Chain and Sprocket

Korea Ever-Power Chain and Sprocket Co., Ltd. combines manufacturing experience with a supply chain positioned specifically for the Korean and Asia-Pacific market. Here is what sets us apart from generic importers:

✦
ISO 9001-certified production — quality management system audited annually; every batch traceable to raw material test certificates
✦
Pre-shipment tensile testing — breaking load verified on each production lot; test reports available on request at no additional charge
✦
Complete series coverage — 25-series through 530H plus O-ring and X-ring sealed variants; no need to source from multiple suppliers
✦
Korean-market proximity — shorter logistics lead times than direct China sourcing; documentation aligned to Korean import requirements
✦
Bulk and custom packaging — 25 m and 50 m reels, pre-cut retail lengths, dealer packs for workshop and fleet maintenance programmes
✦
Technical support in Korean and English — chain selection confirmation, gear ratio calculations, and OEM cross-referencing before your order is placed
Korea Ever-Power chain manufacturing workshop

Frequently Asked Questions

What is the difference between a 520 and a 530 motorcycle chain?
Both share the same pitch of 15.875 mm (5/8 inch), but the 530 has a wider inner width of 9.53 mm versus the 520's 6.35 mm. The wider 530 uses heavier plates and larger pins — hence the higher breaking loads — but also weighs more per metre. Converting a liter-class bike from 530 to 520-series requires matching sprocket replacements but noticeably reduces unsprung rotational inertia.
How often should I lubricate my motorcycle chain?
Unsealed standard chains: every 400–600 km under normal road conditions, or after any rain or off-road riding. O-ring and X-ring sealed chains: every 2,000–4,000 km, but always re-lube after washing the bike. Use a motorcycle-specific chain lubricant — engine oil and WD-40 are not adequate substitutes.
How do I know when my motorcycle chain needs replacing?
Apply the 3% elongation check: measure 20 complete pitches with a ruler. For 428-series (12.70 mm pitch), the nominal 20-pitch length is 254 mm. If your measurement reaches 262 mm or above, replacement is due. Visual signs include stiff links, visible rust, cracked side plates, or rollers that no longer spin freely.
Can I replace just the chain without replacing the sprockets?
Only if the sprockets still show symmetric tooth profiles with no hooked or thinned teeth. If you have been running a worn chain for extended use, the sprocket teeth will have worn to match the elongated chain pitch — fitting a new chain to those sprockets typically halves the new chain's service life. Replacing chain and both sprockets together is the more economical decision.
What chain grade for a 600 cc sport bike used on track days?
A 520H or 525H unsealed heavy-duty chain is the typical track choice. Sealed O-ring chains are not recommended for sustained track use — elevated operating temperatures accelerate O-ring seal degradation. Many track riders also convert from 530 to 520-series to reduce drivetrain rotational weight.
What is the correct chain slack for most motorcycles?
The accepted free-play range is 20–30 mm of vertical movement at the midpoint of the lower chain run, measured with the bike on the side stand. Sport bikes and dual-sport models may specify 15–25 mm. Always confirm against your model's service manual — incorrect tension is a common cause of output shaft bearing failure.
Does Korea Ever-Power supply chains in bulk for dealers and fleet operators?
Yes. We supply in 25 m and 50 m bulk reels as well as pre-cut retail lengths. Motorcycle dealerships and fleet maintenance companies operating in Korea can access volume pricing. Minimum order quantities are flexible — contact our sales team to discuss your annual volume and required chain series.
Are Korea Ever-Power chains compatible with DID, RK, or Tsubaki sprockets?
Yes. All Korea Ever-Power motorcycle chains are manufactured to JIS B 1801 dimensional standards — the same base standard used by DID, RK, Tsubaki, and EK. Roller diameter, pin diameter, inner width, and pitch are all held to JIS tolerances, meaning our chains are direct-fit replacements on any sprocket designed for the same chain number, regardless of brand.

Customer Reviews

Verified feedback from customers in Korea and surrounding markets.

Kim Tae-hyun, Motorcycle Workshop Owner, Busan (early 2025)

"We switched our workshop to Korea Ever-Power 428H chains for mid-size bike services about eight months ago. Customers have not returned with complaints. The chains are fitting cleanly on all the OEM sprockets we stock, and the price difference versus Japanese brands lets us offer a more competitive service rate."

Park Ji-yeon, Delivery Fleet Manager, Seoul (late 2024)

"We run 38 125 cc delivery bikes across Gangnam. Bulk 420-series reels save us roughly 30% per chain versus retail. Mechanics say quality is consistent batch to batch — that predictability is exactly what we need managing this many machines. Lead time has been 10 days to our warehouse."

Choi Min-jun, Track Day Enthusiast, Gyeonggi-do (2024)

"I converted my 600 cc supersport from 530 to 520H and ordered the chain and front sprocket from Korea Ever-Power. The connecting link fitted first time with no filing required. About 3,500 km on the setup now — road and two track days — and there is no visible roller wear yet."

Lee Soo-jin, Adventure Touring Rider, Jeju Island (March 2025)

"Fitted the 525H O-ring chain to my adventure tourer. Put 8,000 km on it across Jeju coastal roads and gravel tracks. Lubed it twice in that entire period, which genuinely surprised me. Previous sealed chain from a Japanese brand needed attention every 3,000 km."

Yoon Dong-hyun, Motocross Competitor, North Gyeongsang Province (2024)

"I go through chains fast in training so cost matters. I use 428H unsealed from Ever-Power for practice and save the premium Japanese sealed chains for race day. In training where I clean the chain after every session, the performance difference is undetectable. No bent or cracked plates in eight months."

Han Byung-chul, Motorcycle Parts Distributor, Incheon (Q1 2025)

"We import roughly 400 units per quarter across the 420, 428, 520, and 530 series. Incoming quality checks — measuring pin diameter and roller diameter against JIS spec — have been consistently within tolerance. No rejection batches in the past 12 months. Documentation is accurate, which keeps customs clearance clean."

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