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Representative image of an RCScrewZ metal-shielded bearing kit for Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089); exact bearing sizes and quantities vary by RC model.
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Infographic reminder: Refer to the item description for more detailed information about the product - kyo090b
Notice: Check the product description for detailed information on the specific bearing sizes included in this bearing kit - kyo090b

Why Choose This Kit

Key features and intended use for this kit.

Shield type

Metal-Shielded (On-Road)

Performance focus

Low-drag, not sealed

Best suited for

Clean operating conditions

Metal-Shielded Bearings

RCScrewZ Metal Shielded Bearing Kit kyo090b for Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089) | SET

RCScrewZSKU: kyo090b

Model-specific metal-shielded bearings for smooth, low-drag rotation in this RC helicopter, intended for clean operating conditions.

Fits: Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089)
OEM / model: 4089

US
Regular price
$69.88
Sale price
$69.88
Regular price
$79.95

In stock

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Confirm this kit fits your RCMatch the RC model and OEM/model number shown above to your vehicle.

Exact model check

Confirm This Fits Your RC

Match the RC model and OEM/model number below before ordering.

RC model
Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089)
OEM / model number
4089
Kit type
Metal-Shielded Bearing Kit — Low-Drag for Cleaner Running
Scale
30-size
Power
Nitro & Glow Fuel
View all verified kits for this model →
More compatibility details
RC brand
Kyosho
Terrain
Aerial
Vehicle class
Helicopter
Kit SKU
kyo090b
Model series
Concept, Concept 30, Concept 30 DX/SE
Product information

Everything You Need Before Ordering

Review what is included, installation notes, shipping details, and complete kit information.

Kit Contents & Installation

What’s Included Model-specific bearing kit; review the listed sizes and quantities.
  • Bearing sizes listed below for this model-specific kit
  • Quantities and any spare bearings are included only when specifically confirmed in the product details.
  • Review the product-specific bearing sizes and styles below or in the full description.

Included bearing sizes for this kit:

    • 3x6x2.5mm Bearings (9)

    • 3x6x2.5mm Thrust Bearings (2)

    • 5x10x4mm Bearings (3)

    • 5x13x4mm Bearings (6)

    • 5x16x5mm Bearings (2)

    • 6x10x3mm Bearings (3)

    • 6x12x4mm Bearings (3)

    • 8x14x4mm Bearings (3)

    • 8x16x5mm Bearings (2)

    • 10x15x4mm Bearings (3)

    • 12x21x5mm Bearings (2)

Installation & Model NotesImportant instructions and model-specific guidance.

Seat bearings fully and squarely. Do not force them into the housing or overtighten the hardware that retains them.

Keep metal-shielded bearings clean and dry.

After cleaning and drying, apply a small amount of light bearing oil.

Details & Support

Kit Details Lower-drag metal shields for clean, dry running conditions.
Shield Type
Metal-Shielded Bearings
Performance Priority
Lower drag
Protection
Not sealed; best kept clean and dry
Best For
Cleaner on-road or prepared surfaces when lower drag is the priority
Not Ideal For
Dust, dirt, sand, mud, water, or frequent wet-condition use
Shipping & Returns Handling time, current delivery estimate, and return policy.
Free shipping on all U.S. orders (USPS Priority Mail).
Ships within 1–2 business days (Mon–Fri); some Saturday shipments by 12:00 PM ET.
Most orders ship from Canton, MI 48187. APO/FPO/DPO & PO Boxes welcome.
Priority Mail typically delivers in 2–3 business days (estimates; not guaranteed).
Easy 30-day returns with prepaid USPS label; refunds issued within 3 business days after the return is received.

Over 99% positive over ~14,000 orders on eBay (last 12 months) — as of October 2025. View on eBay

Full Product Description Read the complete product specifications and details.

Exact RC Model Fitment

Confirm the exact RC model and RC vehicle OEM/model number below before ordering.

Compatible RC Model
Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089)
Compatible RC Brand
Kyosho
RC Vehicle OEM / Model Number(s)
4089
RCScrewZ Kit Part Number
kyo090b

Vehicle Compatibility Details

Review these vehicle details to help confirm compatibility with your RC model.

RC Vehicle OEM / Model Number(s)
4089
RC Chassis Compatibility
Kyosho Concept 30 DX/SE Helicopter (4089)
Compatible Vehicle Type
Class 30 Nitro RC Helicopter
Terrain Compatibility
Aerial
Compatible Scale
30-size
Compatible Fuel Type
Nitro & Glow Fuel

What Is Included

Included bearing sizes for this Metal-Shielded Bearing Kit:

    • 3x6x2.5mm Bearings (9)

    • 3x6x2.5mm Thrust Bearings (2)

    • 5x10x4mm Bearings (3)

    • 5x13x4mm Bearings (6)

    • 5x16x5mm Bearings (2)

    • 6x10x3mm Bearings (3)

    • 6x12x4mm Bearings (3)

    • 8x14x4mm Bearings (3)

    • 8x16x5mm Bearings (2)

    • 10x15x4mm Bearings (3)

    • 12x21x5mm Bearings (2)

What Is Not Included

Only the bearings identified in the included-bearing-size list are part of this kit. 

The RC vehicle and separately sold parts are not included unless specifically listed.

Installation & Model Notes

Metal Shielded Bearing Kit Compatibility:

Quick Fit Summary:

  • Compatible Brand: Kyosho

  • Fit: Model-specific fitment for Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter, OEM/model code 4089.

  • Compatible RC Model/OEM Numbers: 4089

  • Scale: Class 30

  • Power Source / Fuel Type: Nitro & Glow Fuel

  • Battery / Cell Count: Not applicable - nitro powered.

  • Drive Type: Rotor-driven helicopter

  • Vehicle Type: Class 30 Nitro RC Helicopter

  • Chassis: Kyosho Concept 30 DX/SE Helicopter (4089)

  • Era: Early Classics (1980-1989)

  • OEM / Models: 4089

  • RC Model Terrain: Aerial Use

This Kit Details:

  • SKU: kyo090b

  • MPN: kyo090b

  • Kit Type: Metal Shielded Bearing Kit

  • Bearing Type: Metal-Shielded Bearings (Low-Drag)

  • Sealed Bearings: No

  • Water/Dust Protection: Low-drag, not sealed

  • Product Material: Carbon Chrome Steel Bearings

  • Product Color: Silver

Bearing Size Details:

  • 3x6x2.5mm Bearings (9)
  • 3x6x2.5mm Thrust Bearings (2)
  • 5x10x4mm Bearings (3)
  • 5x13x4mm Bearings (6)
  • 5x16x5mm Bearings (2)
  • 6x10x3mm Bearings (3)
  • 6x12x4mm Bearings (3)
  • 8x14x4mm Bearings (3)
  • 8x16x5mm Bearings (2)
  • 10x15x4mm Bearings (3)
  • 12x21x5mm Bearings (2)

OEM / Model Code / Alias Coverage:

  • Verified OEM / Model Codes: 4089

  • Model Series: Concept, Concept 30, Concept 30 DX/SE

Model Family Coverage:

  • Designed for the Kyosho Concept 30 DX/SE family shown in this listing. Do not assume fitment with other Kyosho helicopter variants unless your OEM/model code matches.

Product Benefits:

  • Metal shielded bearings are a low-drag choice for cleaner running, display builds, and smooth drivetrain feel.

  • Best for buyers who prefer reduced rolling resistance over maximum contamination protection.

  • Installation tip: seat bearings fully and avoid over-tightening surrounding hardware.

Fitment Note:

  • Confirm your Kyosho model and OEM/model code before ordering. This kit is intended for Kyosho Concept 30 DX/SE fitment with OEM/model code(s) 4089.

Search-Friendly Notes:

  • Useful for Kyosho helicopter owners searching for Concept 30 DX/SE stainless screws, metal shielded bearings, and model-specific RC maintenance parts.

Metal-Shielded Bearing Kit Details

Review the bearing-kit details below before ordering.

RCScrewZ Kit Part Number
kyo090b
Product Brand
RCScrewZ
Shielding Type
Metal-Shielded (On-Road)
Sealed Bearing Status
No
Bearing Material
Carbon Chrome Bearings
Approximate Piece Count
Color
Silver

Before Ordering

  • Confirm your exact RC model, RC brand, and OEM/model number whenever possible.
  • Review the included-bearing-size list before purchase.
  • Read the installation and model notes before disassembly or installation.

Vehicle versions, chassis revisions, and model-year configurations can differ. 

Confirm fitment before purchase when your RC vehicle differs from the details shown above.

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Fits: Kyosho Concept 30 DX/SE Class 30 Nitro RC Helicopter (4089)
$69.88