Description

Bolt Kit – No 28: The Ultimate Guide to Maintaining Your BMC Fourstroke LT Suspension Performance

If you own a high-performance full-suspension mountain bike like the BMC Fourstroke LT, keeping your rear linkage in perfect condition is essential for smooth riding and long-term reliability. The Bolt Kit – No 28 stands out as the genuine OEM solution designed specifically for this purpose. Whether you’re a weekend warrior tackling technical trails or a competitive rider pushing limits on XC courses, this comprehensive hardware replacement kit restores your bike’s suspension precision like new.

Mountain bike suspension systems endure constant stress from impacts, mud, and vibration. Over time, pivot bolts loosen, bearings wear out, and small components degrade. Replacing them with the right parts prevents costly frame damage and keeps your ride feeling plush and responsive. In this detailed guide, we’ll cover everything you need to know about the Bolt Kit – No 28, from its exact specifications to step-by-step maintenance tips that every BMC owner should follow.

What Is the Bolt Kit – No 28 and Why Do You Need It?

The Bolt Kit – No 28 is BMC’s official spare parts package created exclusively for the long-travel (LT) version of their popular Fourstroke platform. Weighing just 143 grams and finished in sleek black, this lightweight kit delivers everything required to fully refresh the rear suspension linkage internals.

Unlike generic hardware kits that might fit loosely or fail prematurely, the Bolt Kit – No 28 uses premium materials engineered to BMC’s exact tolerances. It restores the 120mm of smooth rear travel that makes the Fourstroke LT such a versatile downcountry machine.

Key components included:

• Long Travel (LT)-specific axles for both front and rear pivots
• High-quality bolts with precise threading
• Enduro MAX bearings (multiple sizes including BB F6800 and BB 6900 series)
• Matching washers and spacers
• All necessary small hardware for a complete linkage rebuild

This isn’t just a handful of random fasteners — it’s a complete system that ensures your suspension pivots rotate freely without play or binding. Riders who neglect linkage maintenance often notice increased noise, reduced small-bump sensitivity, and even frame stress over time. Installing the Bolt Kit – No 28 eliminates these issues and extends the life of your expensive carbon frame.

Perfect Compatibility with BMC Fourstroke LT Models

BMC designed the Bolt Kit – No 28 (SKU 30004132) specifically for Gen 6 Fourstroke models. It fits seamlessly on:

• Fourstroke 01 Gen 6
• Fourstroke R 01 Gen 6
• Fourstroke LT Gen 6
• Standard Fourstroke models equipped with the long-travel linkage

These bikes, introduced around model year 2023 onward, feature BMC’s advanced kinematics that balance efficiency and plushness. The kit is not compatible with earlier generations (pre-2023 frames or non-LT versions), so always double-check your frame’s year and model before ordering.

Owners of the Fourstroke LT praise its 120mm rear travel paired with a 120-130mm fork for an incredibly capable yet efficient ride. Regular linkage service with genuine parts like this kit keeps that performance edge sharp season after season.

Benefits of Choosing the Genuine Bolt Kit – No 28

Why spend nearly $199 on an official kit instead of cheaper aftermarket options? Several compelling reasons stand out:

1. Precision Fit and Longevity — Every axle, bearing, and bolt matches BMC’s factory specifications exactly. No guessing, no modifications needed.
2. Premium Bearings — Equipped with Enduro MAX sealed bearings that resist contamination far better than standard ones.
3. Complete Kit Convenience — Everything arrives in one box, saving hours of hunting individual parts.
4. Warranty Preservation — Using genuine BMC components protects your frame warranty during service.
5. Quiet, Responsive Suspension — Fresh hardware eliminates creaks and restores that buttery feel from day one.

Many riders report noticeable improvements in small-bump compliance and overall bike quietness after installation. On technical descents, the difference is night and day — your bike tracks better and feels more planted.

Signs It’s Time to Replace Your Suspension Hardware

Don’t wait for a catastrophic failure. Watch for these common warning signs:

• Clicking or creaking from the rear linkage area
• Noticeable play when rocking the rear triangle
• Reduced suspension sensitivity over small rocks and roots
• Visible rust, pitting, or bearing discoloration
• Higher rolling resistance or pedal feedback on climbs

If you ride in wet or muddy conditions frequently, inspect your pivots every 50-100 hours of riding. Proactive replacement with the Bolt Kit – No 28 prevents expensive repairs later.

Step-by-Step Installation Guide for Your Bolt Kit – No 28

While professional bike shops handle this service best (especially for torque settings), confident home mechanics can tackle it with the right tools. Always reference your specific model’s service manual for exact torque values.

Tools you’ll need:

• Torque wrench (essential!)
• Allen keys and socket set
• Bearing press or drift tools (optional but recommended)
• Grease and thread locker
• Clean rags and isopropyl alcohol

Basic process outline:

1. Remove the rear wheel and shock for better access.
2. Carefully disassemble the linkage arms one pivot at a time.
3. Press out old bearings and clean all surfaces thoroughly.
4. Install new bearings from the kit using proper pressing technique.
5. Slide in the new axles and bolts, applying grease to contact surfaces.
6. Reassemble in reverse order, torquing everything to spec (typically 8-10 Nm for most pivots).
7. Reinstall the shock, wheel, and check for smooth movement.

Pro tip: Take plenty of photos before disassembly and label parts as you remove them. The exploded diagram included with many BMC kits (or available online) is incredibly helpful for reference.

After installation, ride gently for the first few miles to allow everything to settle, then re-check torque values.

Ongoing Maintenance Tips to Maximize Your Investment

The Bolt Kit – No 28 gives you a fresh start, but consistent care keeps it performing longer:

• Clean and lubricate pivots after every wet ride
• Inspect bearings annually or every 200 hours
• Use a frame protector to reduce debris buildup around linkage
• Consider pairing with a full suspension service kit for the shock and fork

Many Fourstroke LT owners combine this hardware refresh with a fresh set of seals and oil in their rear shock for maximum performance gains.

Where to Buy the Authentic Bolt Kit – No 28

For guaranteed authenticity and fast shipping, purchase directly from authorized BMC dealers or the official BMC website (bmc-switzerland.com or regional stores). Expect to pay around $199 USD depending on your location. Avoid unverified third-party sellers to ensure you receive the genuine black kit with correct part number 30004132.

Authorized shops often include free installation or a quick check-up when you buy the kit through them — a smart way to protect your investment.

Frequently Asked Questions About the Bolt Kit – No 28

Is this kit difficult to install? Intermediate mechanics can handle it with proper tools, but beginners should visit a certified BMC service center.

Does it include bearings for the entire linkage? Yes — every internal bearing, axle, bolt, and washer needed for the LT-specific rear linkage.

Will it fit my 2022 Fourstroke LT? No, this kit is designed for Gen 6 models (2023+). Check your frame year carefully.

How long does the kit last? With proper maintenance, expect 200-400+ hours of riding before another refresh is needed.

Final Thoughts: Keep Your BMC Fourstroke LT Riding Like New

Your BMC Fourstroke LT is an engineering masterpiece built for epic adventures. Protecting that performance starts with quality maintenance — and the Bolt Kit – No 28 is the smartest upgrade you can make to the rear suspension.

Don’t let worn pivots hold back your riding experience. Invest in this genuine hardware kit today and enjoy quieter, smoother, more confident trails for seasons to come. Whether you’re chasing Strava segments or simply exploring new singletrack, a fresh Bolt Kit – No 28 ensures your bike stays as capable as the day you bought it.

Ready to refresh your suspension? Head to your nearest BMC dealer or the official online store and grab the Bolt Kit – No 28 now. Your Fourstroke LT will thank you with miles of reliable, grin-inducing performance.