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Axle Adjuster – No 2: Your Complete Guide to Precision Chain Tensioning for BMC Trackmachine Bikes

In the world of high-performance cycling, every component matters—especially when it comes to maintaining perfect chain tension on a track or fixed-gear bike. If you own a BMC Trackmachine, you already know how critical small parts like the Axle Adjuster – No 2 are for smooth, efficient rides. This genuine BMC spare part delivers the precision engineering that serious cyclists demand.

Whether you’re a competitive track racer, a dedicated fixed-gear enthusiast, or simply someone who wants their BMC bike running at peak performance, understanding the Axle Adjuster – No 2 can save you time, money, and frustration. In this comprehensive guide, we’ll explore everything you need to know about this essential component: what it is, why it matters, how to install and maintain it, and why choosing the genuine BMC version is always the smartest move.

Trackmachine AL ONE

What Exactly Is the Axle Adjuster – No 2?

The Axle Adjuster – No 2 is a pair of high-quality tension bolts (screws sized M5x45 with a precise 0.8mm pitch) designed specifically by BMC Switzerland for their Trackmachine series. Weighing just 12 grams, these lightweight yet durable screws provide the fine adjustments needed for optimal chain tension on bikes equipped with horizontal dropouts or track-style rear ends.

Unlike generic adjusters found on budget bikes, the Axle Adjuster – No 2 is a genuine BMC replacement part engineered to exact factory specifications. It slides into the rear dropout slots and allows riders to push the axle backward or forward in tiny increments, ensuring the chain stays perfectly tensioned without compromising wheel alignment.

Rear dropout chain tension screws – Bike Forums

This simple pair of bolts might look unassuming, but they play a massive role in how your bike performs under high-speed cornering, sprinting, or long training sessions. Proper chain tension prevents skipping, reduces drivetrain wear, and eliminates annoying noises that can ruin your ride.

Why Chain Tension Matters on BMC Trackmachine Bikes

Track bikes like the BMC Trackmachine AL (including the Trackmachine 02 MY2024 models) typically run single-speed or fixed-gear setups. Without a derailleur to manage slack, the chain must be tensioned manually through the rear axle position. Too loose, and you risk chain derailment or power loss. Too tight, and you add unnecessary friction, wear out bearings faster, and increase the chance of frame stress.

The Axle Adjuster – No 2 solves this perfectly. Its fine-thread pitch (0.8mm) lets you make micro-adjustments—often just a fraction of a turn—that generic bolts simply can’t match. This precision keeps your drivetrain quiet, responsive, and long-lasting, which is exactly what BMC owners expect from their premium Swiss-engineered machines.

Trackmachine AL ONE

Key Benefits of the Genuine BMC Axle Adjuster – No 2

Choosing the official Axle Adjuster – No 2 brings several advantages that aftermarket options often can’t replicate:

• Perfect Fit and Compatibility: Designed exclusively for the BMC Trackmachine AL and Trackmachine 02 series, ensuring seamless integration with your frame’s dropout geometry.
• Durability Under Pressure: Heat-treated and precisely machined for years of reliable service, even in the demanding environment of velodrome racing or intense road training.
• Lightweight Performance: At only 12 grams for the pair, it adds zero noticeable weight while delivering factory-level precision.
• Easy Chain Maintenance: Makes wheel removal and reinstallation faster and more accurate, especially when swapping tires or performing deep cleans.
• Peace of Mind: As a genuine BMC part (SKU 213702), it maintains your bike’s warranty eligibility and resale value.

Riders who upgrade or replace with the Axle Adjuster – No 2 often report smoother pedaling, reduced chain slap, and longer intervals between full drivetrain overhauls.

Step-by-Step Installation Guide for Axle Adjuster – No 2

Installing the Axle Adjuster – No 2 is straightforward and takes most riders under 15 minutes. Here’s how to do it right:

1. Prepare Your Workspace: Park your BMC Trackmachine on a stable stand. Gather a 5mm Allen key, torque wrench (if available), and clean rags.
2. Remove the Rear Wheel: Loosen the axle nuts or quick-release and slide the wheel out carefully.
3. Insert the Adjusters: Thread one Axle Adjuster – No 2 bolt into each side of the rear dropout slots. Start with a few turns by hand to avoid cross-threading.
4. Reinstall the Wheel: Slide the axle back into position, ensuring the chain is routed correctly over the sprockets.
5. Adjust Tension: Turn both bolts equally (usually clockwise to tighten the chain) while checking chain slack. Aim for 1–2 cm of vertical play in the lower chain run when measured midway between chainring and sprocket.

Easy Way to Tension Your Fixed Gear Chain

6. Check Alignment: Use the frame’s alignment marks or a straightedge to confirm the wheel sits perfectly centered.
7. Torque and Test: Tighten the axle nuts to BMC’s recommended specs (check your owner’s manual) and spin the wheel to verify smooth, quiet operation.

Pro tip: Always adjust both sides evenly to maintain perfect wheel dish and avoid braking issues.

Can I cut out this part of the dropout to tighten the chain? : r/bikewrench

Maintenance Tips to Maximize the Life of Your Axle Adjuster – No 2

Like any high-precision part, the Axle Adjuster – No 2 performs best with regular care:

• Clean the threads after every wet ride to prevent corrosion.
• Apply a light coat of bicycle-specific grease during reassembly.
• Inspect for wear every 1,000–2,000 km or before major events.
• Replace immediately if threads become damaged or adjustment feels gritty.

Combining the Axle Adjuster – No 2 with routine chain cleaning and lubrication extends the life of your entire drivetrain dramatically.

Common Problems Solved by the Axle Adjuster – No 2

Many Trackmachine owners notice chain issues after heavy use or when switching between different wheelsets. Symptoms like skipping under load, excessive noise, or uneven wear usually trace back to improper tension. Swapping in a fresh pair of Axle Adjuster – No 2 bolts restores factory precision instantly and eliminates these headaches.

Genuine vs. Aftermarket: Why BMC’s Version Wins

While cheaper universal axle adjusters exist, they rarely match the exact pitch, length, and material quality of the Axle Adjuster – No 2. Using non-genuine parts can lead to poor fit, accelerated wear, or even frame damage over time. For the small investment (around $15), the official BMC part delivers unmatched reliability and performance.

Frequently Asked Questions About Axle Adjuster – No 2

Q: Which bikes is the Axle Adjuster – No 2 compatible with? A: It’s designed for BMC Trackmachine AL models, including the Trackmachine 02 MY2024.

Q: How often should I check or replace it? A: Inspect during every chain cleaning; replace every 2–3 years or if adjustment becomes difficult.

Q: Can I use it with quick-release or thru-axle wheels? A: Yes—it’s compatible with standard track-style axles used on these models.

Q: Where can I buy the official Axle Adjuster – No 2? A: Direct from BMC authorized dealers or the official BMC website for guaranteed authenticity.

Final Thoughts: Invest in the Right Parts for Peak Performance

The Axle Adjuster – No 2 might be one of the smallest components on your BMC Trackmachine, but its impact on ride quality, safety, and longevity is huge. By keeping your chain perfectly tensioned, it helps you ride faster, smoother, and with greater confidence—whether you’re chasing podiums on the track or logging training miles on the road.

Don’t wait until your chain starts skipping or your rides feel off. Grab a pair of genuine Axle Adjuster – No 2 bolts today and give your BMC bike the precision maintenance it deserves. Your drivetrain (and your legs) will thank you on every pedal stroke.

Ride strong, stay precise, and enjoy the unmatched performance that only genuine BMC parts can deliver. If you have questions about installing your Axle Adjuster – No 2 or need more Trackmachine maintenance tips, drop a comment below—we’re here to help fellow BMC riders keep rolling at their best!