Wolf Tooth
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Wolf Tooth Components 25mm Long B-Screw for Adapting Old deraileurs When | bike-drivetrain-components
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Wolf Tooth Components 25mm Long B-Screw for Adapting Old deraileurs When | bike-drivetrain-components
High quality stainless steel screw is compatible with most Shimano mountain bike derailleurs.
Wolf Tooth Components 25mm Long B-Screw for Adapting Old deraileurs When | bike-drivetrain-components
Item #: 4141946

Wolf Tooth Components 25mm Long B-Screw for Adapting Old deraileurs When | bike-drivetrain-components

Item #: 4141946

JOD 9

Price Details

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*All items will import from US

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Only 11 items left in stock.
Order now and get it around Friday, July 17
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High quality stainless steel screw is compatible with most Shimano mountain bike derailleurs.
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What Stands Out

Versatile Compatibility
Designed to adapt older derailleur systems, making it ideal for retrofitting or upgrading bikes with modern components and compatibility issues.
Durable Construction
Made from high-quality materials ensuring longevity and reliability, while handling the demands of varying riding conditions without compromising performance.
Easy Installation
User-friendly design allows for quick and hassle-free installation, enabling riders to make adjustments conveniently without requiring professional assistance.

Product Details

Shop for high quality stainless steel 25mm B-screws at Ubuy Jordan. Compatible with Shimano mountain bike derailleurs. Perfect for Wolf Tooth GC 42 and GC 40 cogs. Buy now!
  • Replaces stock B-limit screw on Shimano MTB derailleurs
  • Compatible with most Shimano mountain bike derailleurs
  • Used with Wolf Tooth GC 42 or GC 40 large cogs
  • Made of high quality stainless steel
  • Ensures proper adjustment when using replacement cogs
  • 18-8 stainless steel screw for durability
Item Dimensions4 x 2 x 0.25 inches (10.2 x 5.1 x 0.6 cm)
Thread Size4mm
Item Weight0.01 Pounds (0 grams)
Thread CoverageFully Threaded
Fastener SizeM4 x 25mm
Size Name4mm x 25mm
Item Diameter4 Millimeters
Compatible Groove Diameter4 Millimeters
Number of Pieces1
BrandWolf Tooth
ColorSilver
Fastener TypeScrew (M4 thread size)
UPC812719020152
Global Trade Identification Number00812719020152
Set NameSingle Screw Set (M4 x 25mm)
Number Of Items1
Part NumberBSCREW25
ModelBSCREW25
Unit Count1.0 Count
ManufacturerWolf Tooth
Included ComponentsMiscellaneous Rear Derailleur Part
Screw Head StylePhillips
Screw Point Stylecylindrical
Head TypePhillips
Thread TypeMetric
Set Screw Thread TypeM4 x 0.7mm
Thread StyleM4
Thread Class2B
Maximum Shear Strength550 MPa
Grade RatingPremium
Drive SystemBicycle Derailleur Drive System
Material TypeMulti
Exterior FinishStainless Steel
Metal TypeStainless Steel
Finish TypesStainless Steel
MaterialMulti
Head StylePhillips
Item dimensions L x W x H4 x 2 x 0.25 inches (10.2 x 5.1 x 0.6 cm)

What's in the box

Miscellaneous Rear Derailleur Part

Who Should Buy?

Suitable For
  • Older Derailleur Users

    Ideal for cyclists with older derailleur models needing adjustments for modern setups and ensuring proper shifting performance.

  • Bicycle Mechanics

    Great for bike mechanics who often work on vintage bikes, providing more flexibility in compatibility with various components.

  • Customization Enthusiasts

    Perfect for cyclists looking to customize their bike's shifting system, offering adaptability for different setups and efficiencies.

Not Suitable For
  • Modern Derailleur Users

    Not suitable for users with modern derailleur systems that do not require the adjustment facilitated by this longer screw.

  • Casual Riders

    Casual cyclists may not benefit from this product as they typically use standard components without needing adjustments.

  • Professional Racers

    Professional racers usually prefer specific, high-performance components and may not require the flexibility of this screw.

Product Description

Have any Query? Chat with us

Customer Questions & Answers

  • Question: Is this screw compatible with all Shimano derailleurs?

    Answer: It is compatible with most Shimano mountain bike derailleurs.
  • Question: Is it easy to install?

    Answer: Yes, it replaces the stock B-limit screw on Shimano MTB derailleurs.
  • Question: How durable is the stainless steel screw?

    Answer: It is made of high-quality stainless steel, ensuring durability and reliable performance.
  • Question: Is this product compatible with Shimano Derailleurs (specifically a 105 10sp)?

    Answer: It fit on a circa 2001 LX.
  • Question: Is this considered a Dropout screw for adjusting tire between stays?

    Answer: No it is for adjusting the rear derailleur jockey wheel further from the cog.
  • Question: Will this work on Suntour Honor derailleur?

    Answer: I believe all the B-screws are the same.
  • Question: Shimano Ultegra 6800 compatible?

    Answer: Worked in my Shimano setup.
  • Question: Will this work on a pure fix frame?

    Answer: This is a b limit screw designed to allow you to adjust the rear derailleur jockey wheel further away from the cogs to accommodate a larger cog. It may not be suitable for your application.
  • Question: What width or size is this M4? Thread type and length.

    Answer: Take the old one to the hardware store and match the threads and size. They are metric. 25mm is long enough to adjust body angle of derailleur for clearance between biggest cassette cog and upper jockey wheel when in lowest gear.

Wolf Tooth Front Derailleurs Editorial Review

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  • ubuy Jordan
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Customer Reviews & Ratings

4.5
243 customers ratings
  • 5 Star
    77%
  • 4 Star
    11%
  • 3 Star
    5%
  • 2 Star
    2%
  • 1 Star
    5%

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12 June 2026 · via Trustpilot
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Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
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JOD 9

Order now and get it around Friday, July 17

QTY:

Only 11 items left in stock.
Secured transactionsecured transaction

Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.

Our Top Logistics Partners
  • fedex
  • dhl
Fastest cross-border delivery

Features & Benefits

  • Compatible with most Shimano mountain bike derailleurs
  • Replaces stock B-limit screw on Shimano MTB derailleurs
  • Made of high-quality stainless steel
  • Specifically designed for use with Wolf Tooth GC 42 or GC 40 large cogs
  • Ensures proper adjustment when using the replacement cogs
  • Guarantees durability and reliable performance