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Bolt Kit – No 21: Complete Guide to BMC’s Titanium Pivot Hardware for Speedfox MTB Maintenance

If you own a BMC Speedfox and want to keep your full-suspension mountain bike performing at its peak, replacing worn pivot hardware is one of the smartest upgrades you can make. The Bolt Kit – No 21 is the official titanium replacement set designed specifically for these iconic Swiss bikes. Lightweight, corrosion-resistant, and built for high-performance riding, this kit restores precise suspension action and protects your frame for years to come.

Whether you’re a weekend trail rider or a serious enduro enthusiast, understanding the Bolt Kit – No 21 helps you maintain smooth kinematics, reduce weight, and avoid expensive frame repairs. In this in-depth guide, we’ll cover everything: what the kit contains, why titanium beats steel, exact compatibility, installation tips, benefits on the trail, and where to buy the genuine part.

Bolt Kit – No 21 Titanium 222997

What Exactly Is the Bolt Kit – No 21?

The Bolt Kit – No 21 is an original BMC spare parts set made from premium-grade titanium. Officially listed as “Bolt Kit – No 21 Titanium” (SKU 222997), it provides the critical long bolts needed for the rear suspension pivot points on specific Speedfox frames.

Unlike generic hardware store bolts, this kit is engineered to match BMC’s exact tolerances. It includes six long titanium bolts that replace the factory pivot fasteners. These bolts sit at the heart of the suspension linkage, where they handle constant flex, vibration, and water exposure on the trail. Over time, original steel bolts can corrode, stretch, or develop play — leading to noisy suspension, reduced efficiency, and accelerated wear on bearings and bushings.

BMC packages the Bolt Kit – No 21 specifically for easy maintenance. The titanium construction delivers a perfect balance of strength and low weight, making it the preferred choice for riders who value every gram saved on their bike.

Compatible Models: Does the Bolt Kit – No 21 Fit Your Bike?

This kit is designed exclusively for two classic BMC full-suspension 29-inch models:

• BMC Speedfox SF02 29
• BMC Speedfox SF03 29

It is most commonly referenced for 2016 model-year frames, though it may fit slightly earlier or later versions depending on the exact frame revision. Always check your bike’s serial number (located near the bottom bracket) and consult your owner’s manual or a BMC dealer to confirm fitment before ordering.

If you ride a newer Speedfox, Trailfox, or Fourstroke, BMC offers other numbered kits (No. 22, No. 23, etc.). Using the correct Bolt Kit – No 21 ensures perfect alignment and prevents damage to your carbon or aluminum frame.

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Why Titanium? The Science Behind the Bolt Kit – No 21

Steel bolts are heavy and prone to rust — especially in muddy, wet mountain conditions. Titanium changes the game completely:

• 40-50% lighter than equivalent steel bolts while maintaining equal or higher tensile strength
• Zero corrosion — even after years of exposure to sweat, rain, trail dust, and pressure washing
• Superior fatigue resistance — titanium flexes without cracking under the repeated loads of aggressive riding
• No galling — threads stay smooth and easy to install/remove without seizing

These advantages translate directly to better suspension performance. Lighter pivots mean less unsprung weight, so your rear shock reacts faster and tracks the terrain more accurately. Riders often notice crisper pedaling, improved small-bump sensitivity, and a quieter ride after installing the Bolt Kit – No 21.

Many aftermarket titanium kits exist, but only the official BMC version guarantees exact thread pitch, shoulder length, and head design to match the factory linkage. Using non-OEM parts can void warranties or cause binding in the suspension.

Key Specifications of Bolt Kit – No 21

• Material: Aerospace-grade titanium
• Contents: 6 long pivot bolts (plus associated washers and circlips in most kits)
• Color: Natural titanium silver with blue thread-lock patches
• Weight: Significantly lighter than stock steel hardware
• Price: Approximately USD 79 (official BMC retail)
• Designed for: Rear suspension pivot points on SF02/SF03 29 frames

The kit arrives ready to install with pre-applied thread locker on critical bolts for security.

Specialized Titanium-Bolt Suspension Pivot Hardware Kit (8mm) (M5) (20

Real-World Benefits: How the Bolt Kit – No 21 Improves Your Ride

Installing this titanium set isn’t just maintenance — it’s an upgrade. Here’s what riders typically experience:

1. Smoother Suspension Action — Fresh, precise bolts eliminate play and restore the intended kinematics.
2. Reduced Maintenance — Titanium never rusts, so future servicing is faster and cheaper.
3. Weight Savings — Every gram counts on climbs and technical sections.
4. Longer Bearing Life — Proper alignment prevents premature wear on pivot bearings.
5. Better Trail Feel — Quicker rebound and more confidence in rough terrain.

Many owners of older Speedfox models report that replacing pivot hardware with the Bolt Kit – No 21 feels like riding a newer bike again.

Step-by-Step Installation Guide for Bolt Kit – No 21

While we always recommend a professional mechanic for full-suspension work, experienced DIY riders can handle this job with basic tools. Here’s a general overview:

• Support the bike on a stand and remove the rear shock if needed for access.
• Carefully remove old bolts one at a time (note orientation).
• Clean all pivot areas and inspect bushings/bearings — replace if worn.
• Apply a thin layer of anti-seize or the included thread locker.
• Install new Bolt Kit – No 21 bolts in the correct sequence and torque to BMC specifications (usually 15-20 Nm depending on the pivot — check your manual).
• Reinstall the shock, cycle the suspension, and check for smooth movement.
• Test ride gently and re-torque after the first 50 km.

Pro tip: Take photos before disassembly so you know exactly where everything goes. A torque wrench is essential — guessing can damage threads or cause loose pivots.

Maintenance Schedule: When Should You Replace Your Bolts?

BMC recommends inspecting pivot hardware every 1,000–2,000 km or annually, whichever comes first. Replace with the Bolt Kit – No 21 if you notice:

• Clicking or creaking from the rear end
• Vertical play in the linkage
• Visible rust or pitting on existing bolts
• Suspension that feels harsh or inconsistent

Staying on top of this simple job prevents costly frame or bearing damage later.

Where to Buy Genuine Bolt Kit – No 21

Always purchase from authorized sources to guarantee authenticity:

• Official BMC website (us.bmc-switzerland.com)
• BMC-certified dealers and online shops
• Trusted retailers like LVR Cycles or local bike shops

Avoid unverified third-party sellers offering suspiciously cheap “compatible” kits. The genuine Bolt Kit – No 21 comes with BMC packaging and the peace of mind that it fits perfectly.

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Frequently Asked Questions About Bolt Kit – No 21

Is the Bolt Kit – No 21 only bolts or does it include bearings? The official kit focuses on the six long titanium bolts. Some retailers bundle it with bearings — check the product listing. If your bike needs bearings too, look at BMC’s complete pivot kits.

Can I use the Bolt Kit – No 21 on carbon frames? Yes — it’s designed for both aluminum and carbon Speedfox models of the era.

How much weight does it save? Expect 50–80 grams total savings depending on the old steel bolts being replaced.

Will this fix a noisy suspension? In most cases, yes — loose or corroded pivot bolts are a common cause of creaking.

Is professional installation required? Not strictly, but if you’re unsure about torque specs or suspension geometry, take it to a BMC-trained shop.

Bolt Kit – No 21 vs Aftermarket Titanium Kits — Which Wins?

Aftermarket options may look similar and cost less, but they often use different thread pitches or head designs. The official Bolt Kit – No 21 is tested and approved by BMC engineers for perfect fit and longevity. For most riders, the slight price difference is worth it for warranty peace of mind and guaranteed performance.

Final Thoughts: Keep Your BMC Speedfox Feeling New

The Bolt Kit – No 21 is a small but mighty upgrade that delivers big results on the trail. By swapping in these titanium pivot bolts, you protect your investment, improve ride quality, and enjoy many more worry-free kilometers.

If your Speedfox SF02 or SF03 is starting to feel tired in the rear end, don’t wait — order your Bolt Kit – No 21 today and experience the difference genuine BMC titanium hardware makes. Your bike (and your legs) will thank you on the next big descent.

Ready to refresh your suspension? Head to the official BMC store or your local dealer and ask for Bolt Kit – No 21 by name. Ride stronger, ride longer.