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  3. PAUL COMPONENTS BOXCAR

PAUL COMPONENTS Boxcar Stem Clamp Area 810107830567 7/8 22.2MM 0D 35MM

Paul Components 810107830567 Boxcar Stem 7/8 Inch 22.2mm Clamp Area - 0d X 35mm Green

( Brand: Paul Components ), ( Manufacturer Part Number: BOXCAR ), ( Part Type: Boxcar Stem Clamp ), ( Color: Green ), ( Custom Bundle: No ), ( Stem Type: Threadless ), ( Item Length: 35mm ), ( Steerer Tube Diameter: 1 1/8 In ), ( Clamp Diameter: 22.2 Mm ), ( UPC: 810107830567 )

Review PAUL COMPONENTS Stem 7/8 Inch 22.2mm Clamp Area 0d 35mm Green

The **Paul 810107830567 Boxcar STEM 7/8" (22.2mm) Clamp Area 0D 35mm** is a precision-engineered, high-performance optical clamp designed to meet the rigorous demands of modern scientific, industrial, and educational applications. Part of Paul s renowned **Boxcar** series, this clamp combines durability, versatility, and advanced functionality to ensure stable, repeatable, and secure mounting of optical components, lenses, filters, or other precision instruments. Its **7/8" (22.2mm) clamp area** provides ample surface space for accommodating a wide range of 35mm optical elements, including lenses, beam splitters, and sensor mounts, while the **0D (zero-degree) design** eliminates any tilt or angular misalignment, guaranteeing perfect axial alignment for critical optical setups. The robust construction features a **high-grade aluminum body**, offering exceptional resistance to warping, corrosion, and thermal fluctuations, making it ideal for both laboratory and field environments. Engineered with **fine-threaded adjustment mechanisms**, this clamp allows for precise, incremental positioning with minimal backlash, ensuring consistent and reproducible results in optical experiments, microscopy, or laser systems. The **35mm optical thread** compatibility further enhances its utility, enabling seamless integration with standard optical mounts, adapters, and accessories. Whether used in educational STEM programs to teach principles of optics, in industrial automation for precision alignment tasks, or in research laboratories for high-precision optical experiments, the Paul Boxcar STEM clamp delivers reliability and performance that aligns with the most demanding applications. Its thoughtful design, combined with Paul s reputation for quality engineering, makes it an indispensable tool for professionals and enthusiasts alike who require both stability and adaptability in their optical setups.

The **Paul 810107830567 Boxcar Stem** (7/8" clamp area, 22.2mm, 0D, 35mm) is a popular choice for cyclists upgrading their bike s bottom bracket system, particularly for those using square-taper cranks or transitioning to modern standards. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Compatibility with Square-Taper Cranks**

The stem is designed for **square-taper bottom brackets**, making it ideal for older bikes or those using **Shimano Hollowtech II, SRAM DUB, or other square-taper systems**. This is useful for riders who want to retain their existing cranks while upgrading other components.

2. **Standardized 35mm Clamp Width**

The **35mm clamp area** is a common width for many road and gravel bikes, ensuring a snug fit with most frame dropouts. This reduces the need for custom spacers or adapters in most cases.

3. **Durability and Load Capacity**

Paul components are known for their **robust construction**, often using **steel or high-grade aluminum** to handle the stresses of pedaling. The **7/8" clamp area** (a legacy standard) is still widely used in older bikes and some modern builds, offering a secure fit.

4. **Easy Installation**

The **0D (zero-degree) design** means the stem is straight, simplifying installation without requiring additional spacers for alignment. This is particularly helpful for riders who prefer a clean, minimalist setup.

5. **Budget-Friendly Option**

Compared to modern **BB30, BB86, or Hollowtech II** stems, this option is often **more affordable**, making it a practical choice for riders on a budget or those retrofitting older bikes.

6. **Wide Availability**

As a legacy part, this stem is **easily found in most bike shops and online retailers**, reducing lead times and ensuring quick replacements if needed.

7. **Backward Compatibility**

If you re upgrading a bike with a **square-taper bottom bracket**, this stem avoids the need for a full rebuild. It can be paired with **modern wheels and drivetrains** while keeping the existing crankset.

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### **Cons**

1. **Limited to Square-Taper Systems**

The stem is **not compatible with modern hollowtech cranks** (e.g., Shimano s latest Hollowtech II or SRAM s XX1/X01). If you plan to upgrade to a **one-piece crankset**, you ll need a different stem (e.g., BB30 or BB86).

2. **Potential for Looseness Over Time**

Square-taper bottom brackets can develop **play or looseness** if not maintained properly. Unlike modern sealed cartridge bearings, these require **regular greasing and inspection**, which may be inconvenient for some riders.

3. **Less Common in New Bikes**

Most **modern bikes (2010s and later)** come with **hollowtech or cartridge bottom brackets**, making this stem **less relevant for new builds**. It may not fit seamlessly with newer frame designs.

4. **Weight Consideration**

While not excessively heavy, **square-taper stems and cranks are generally heavier** than modern hollowtech or BB30 setups. This may be noticeable in climbs or time trials.

5. **Limited Aftermarket Support**

Some **modern wheels and drivetrains** are optimized for **hollowtech or cartridge bottom brackets**, meaning compatibility with this stem may require additional adapters or spacers.

6. **Potential for Misalignment**

If the frame s dropout spacing doesn t match the stem s **35mm clamp width exactly**, slight misalignment can occur, leading to **uneven wear on the chain or drivetrain**.

7. **Resale Value Concerns**

If you ever sell the bike, a **square-taper bottom bracket** may deter buyers looking for modern, low-maintenance setups.

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### **Conclusion**

The **Paul 810107830567 Boxcar Stem** is a **practical and durable choice** for riders who:

- Have an **older bike with square-taper cranks** and want to keep them.

- Prefer a **simple, no-frills upgrade** without investing in a full bottom bracket overhaul.

- Are on a **tight budget** or need a quick replacement.

- Don t plan to switch to **modern hollowtech or cartridge cranks** in the near future.

However, if you re building a **new bike, upgrading to a one-piece crankset, or prioritizing modern standards**, this stem may be **outdated or limiting**. In such cases, investing in a **BB30, BB86, or Hollowtech II-compatible stem** would be more future-proof.

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### **Recommendation**

- **Buy this stem if:**

- You have a **square-taper bottom bracket** and want to retain your existing cranks.

- You re **retrofitting an older bike** and need a reliable, affordable solution.

- You don t mind **regular maintenance** (greasing, checking for looseness).

- **Avoid this stem if:**

- You re **building a new bike** or upgrading to **modern cranks** (hollowtech, BB30, etc.).

- You want **sealed, low-maintenance bearings** (cartridge bottom brackets).

- You plan to **sell the bike in the future**, as square-taper setups may reduce appeal.

For **most modern builds**, consider alternatives like:

- **BB30 stems** (for Shimano Hollowtech II)

- **BB86 stems** (for SRAM XX1/X01)

- **Hollowtech II-compatible stems** (if keeping Shimano cranks)

If you re certain about sticking with square-taper, this Paul stem is a **solid, no-nonsense choice**. Otherwise, upgrading to a more contemporary standard would be the better long-term investment.

Details:

The stem has a 35mm reach and no rise. The last photo was taken outside against the snow to show color in sunlight. I have tried to show them in the photos. Gently used Paul Boxcar stem for 7/8 22.2mm bars.

specifications ribicycl:

  • brand: Paul Components
  • mpn: Boxcar
  • part type: Boxcar Stem Clamp
  • color: Green
  • custom bundle: No
  • stem type: Threadless
  • item length: 35mm
  • steerer tube diameter: 1 1/8 In
  • clamp diameter: 22.2 Mm
  • upc: 810107830567

returns ribicycl:

  • policy: No Returns

seller ribicycl:

  • city: Mount Airy, North Carolina
  • rating: 100.0%
  • # reviews: 1627

general ribicycl:

  • condition: Used
  • Cycling > Bicycle Components Parts > Stems

shipping ribicycl:

  • transit: 3-7 Days
  • class: Standard
  • type: Calculated
  • service: USPS Ground Advantage
  • carrier: USPS
  • cost: $5.52

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  • other
  • wallet: Google-pay
  • credit card: Discover

offer ribicycl:

  • started: February 2, 2026
  • best offers: True
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • quantity: 1
part type: boxcar stem clamp, custom bundle: no, stem type: threadless, item length: 35mm, steerer tube diameter: 1 1/8 in, clamp diameter: 22.2 mm,
category: sporting goods > cycling > bicycle components parts > stems, color: green, sku: 16536770774991722,
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