--- product_id: 65684652 title: "Wolf Tooth Components 25mm long B-Screw for adapting old deraileurs when using a by Wolf Tooth Components" brand: "wolf tooth" price: "5399 som" currency: KGS in_stock: true reviews_count: 6 category: "Wolf Tooth" url: https://www.desertcart.kg/products/65684652-wolf-tooth-components-25mm-long-b-screw-for-adapting-old store_origin: KG region: Kyrgyzstan --- # 25mm precision length 18-8 stainless steel durability Optimized for Shimano MTB derailleurs Wolf Tooth Components 25mm long B-Screw for adapting old deraileurs when using a by Wolf Tooth Components **Brand:** wolf tooth **Price:** 5399 som **Availability:** ✅ In Stock ## Summary > 🔧 Small Screw, Huge Shift: Unlock your drivetrain’s true potential! ## Quick Answers - **What is this?** Wolf Tooth Components 25mm long B-Screw for adapting old deraileurs when using a by Wolf Tooth Components by wolf tooth - **How much does it cost?** 5399 som with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/65684652-wolf-tooth-components-25mm-long-b-screw-for-adapting-old) ## Best For - wolf tooth enthusiasts ## Why This Product - Trusted wolf tooth brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Lightweight Yet Tough:** At just 0.01 pounds, this screw adds zero bulk while delivering maximum shear strength (550 MPa) for reliable durability. - • **Precision Adjustment Screw:** 25mm length provides the exact derailleur cage positioning needed for smooth, crisp shifting performance. - • **Premium Stainless Steel Build:** Crafted from high-grade 18-8 stainless steel ensuring corrosion resistance and long-lasting strength under all riding conditions. - • **Upgrade Your Shimano MTB Setup:** Replaces the stock B-limit screw to unlock the full potential of your mountain bike’s drivetrain with minimal effort. - • **Perfect Fit for Wide-Range Cogs:** Specifically engineered to work seamlessly with Wolf Tooth GC 42 and GC 40 large cogs for flawless drivetrain alignment. ## Overview The Wolf Tooth Components 25mm B-Screw is a precision-engineered stainless steel replacement screw designed to optimize Shimano mountain bike derailleurs when paired with Wolf Tooth’s GC 42 or GC 40 large cogs. This durable, corrosion-resistant screw ensures perfect derailleur cage positioning for cleaner shifts and improved chain management, making it an essential upgrade for serious MTB riders seeking flawless drivetrain performance. ## Description When using the Wolf Tooth GC 42 (50-3898) or GC 40 (50-3899) replacement cogs with a Shimano rear derailleur, a longer B-screw will be needed for proper adjustment. High quality 18-8 stainless steel screw is compatible with most Shimano mountain bike derailleurs. Replaces stock B-limit screw on Shimano MTB derailleurs Use if you are using Wolf Tooth GC 42 or GC 40 large cogs High quality stainless steel Review: It does the job - It is a good screw Review: The Wolf Tooth 25mm B-Screw might seem like a tiny, unassuming component, but it makes a huge difference in your bike's drivetrain setup. If you’ve got a Shimano derailleur and are looking to ensure proper derailleur alignment, this B-screw is a must-have. Made from durable materials, it’s designed to provide precision adjustment for your derailleur cage, giving you cleaner shifts and better chain management. It’s especially helpful if you’ve recently swapped to a wide-range cassette or if your original B-screw has worn down. Final Verdict: 9/10 – Simple, effective, and well-made. A small upgrade that improves your bike's performance. 🚴‍♂️🔩 ## Features - Replaces stock B-limit ************************************************************* on Shimano MTB derailleurs - Use if you are using Wolf Tooth GC 42 or GC 40 large cogs - High quality stainless steel ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00LMY7BA0 | | Best Sellers Rank | 119,313 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 435 in Bike Derailleurs & Parts 436 in Screws (Sports & Outdoors) | | Brand Name | Wolf Tooth | | Colour | Silver | | Compatible Groove Diameter | 4 Millimeters | | Customer Reviews | 4.3 4.3 out of 5 stars (237) | | Drive System | Bicycle Derailleur Drive System | | Exterior Finish | Stainless Steel | | Fastener Size | M4 x 25mm | | Fastener Type | Screw (M4 thread size) | | Finish Types | Uncoated | | Global Trade Identification Number | 00812719020152 | | Grade Rating | Premium | | Head Type | Phillips | | Included Components | Miscellaneous Rear Derailleur Part | | Item Diameter | 4 Millimetres | | Item Dimensions | 10.2 x 5.1 x 0.6 centimetres | | Item Weight | 0.01 Pounds | | Manufacturer Part Number | BSCREW25 | | Material Type | Stainless Steel | | Maximum Shear Strength | 550 MPa | | Metal | Stainless Steel | | Model Number | BSCREW25 | | Number of Pieces | 1 | | Screw Head Style | Phillips | | Screw Point Style | cylindrical | | Set Name | Single Screw Set (M4 x 25mm) | | Set Screw Thread Type | M4 x 0.7mm | | Size | M4 x 25mm | | Thread Class | standard | | Thread Coverage | Fully Threaded | | Thread Size | 4mm | | Thread Style | M4 | | Thread Type | Metric | | UPC | 812719020152 | ## Product Details - **Exterior finish:** Stainless Steel - **Head style:** Phillips - **Item dimensions L x W x H:** 10.2 x 5.1 x 0.6 centimetres - **Material:** Stainless Steel - **Thread size:** 4mm ## Images ![Wolf Tooth Components 25mm long B-Screw for adapting old deraileurs when using a by Wolf Tooth Components - Image 1](https://m.media-amazon.com/images/I/61DD++TmylL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ It does the job *by S***S on 4 September 2022* It is a good screw ### ⭐⭐⭐⭐⭐ Review *by N***9 on 2 February 2025* The Wolf Tooth 25mm B-Screw might seem like a tiny, unassuming component, but it makes a huge difference in your bike's drivetrain setup. If you’ve got a Shimano derailleur and are looking to ensure proper derailleur alignment, this B-screw is a must-have. Made from durable materials, it’s designed to provide precision adjustment for your derailleur cage, giving you cleaner shifts and better chain management. It’s especially helpful if you’ve recently swapped to a wide-range cassette or if your original B-screw has worn down. Final Verdict: 9/10 – Simple, effective, and well-made. A small upgrade that improves your bike's performance. 🚴‍♂️🔩 ### ⭐⭐⭐⭐⭐ Review *by D***C on 5 July 2024* I used this to replace the B limit screw on my Shimano derailleur after it was bent in a particularly muddy mountain bike race. It works perfectly! ## Frequently Bought Together - Wolf Tooth Components 25mm B-Screw - Wolf Tooth Components Roadlink - Wolf Tooth GoatLink for Shimano --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kg/products/65684652-wolf-tooth-components-25mm-long-b-screw-for-adapting-old](https://www.desertcart.kg/products/65684652-wolf-tooth-components-25mm-long-b-screw-for-adapting-old) --- *Product available on Desertcart Kyrgyzstan* *Store origin: KG* *Last updated: 2026-04-28*