Bimecc Stud & Nut Conversion Kit

A must-have for drivers looking to enhance both ease of wheel installation and vehicle aesthetics. This kit is particularly beneficial for those running aftermarket wheels and/or spacers, ensuring proper fitment, safety, and security.

Also available with Copper nuts.

Each kit is sold as a complete vehicle set for 5-bolt wheels. If you have 4-bolt wheels, Bimecc studs and nuts can be purchased separately.

Why Choose a Stud & Nut Conversion?

Safety & Security

When installing spacers or aftermarket wheels, the available thread engagement for securing your wheels may be reduced.

• Aftermarket wheels often have a thicker mounting surface, requiring longer studs/bolts for proper fitment.
• Spacers shift the wheel further from the hub, reducing the available thread engagement by the thickness of the spacer.

For example, installing a 15mm spacer reduces your thread engagement by 15mm. To maintain safety, this lost thread length must be recovered using longer studs or bolts.

Why Use the Bimecc Stud & Nut Conversion Kit?

While longer bolts are an option, converting to studs and nuts is the preferred solution for both safety and ease of installation.

• Faster & easier wheel changes – Studs act as guides, eliminating the hassle of aligning bolt holes when mounting wheels.
• Stronger & more secure – Provides consistent and proper thread engagement, essential for safety.
• Ideal for track use – Increased durability and reliability under high-performance driving conditions.

TÜV Approved for Quality & Safety

The Bimecc Stud & Nut Conversion Kit carries TÜV approval, meaning it meets strict quality, safety, and sustainability standards.

Compatibility & Options

Available in a variety of thread diameters, pitches, and stud lengths, making it compatible with a wide range of vehicles.

Thread Diameter & Pitch

• M12 x 1.5 – BMW E Series
• M14 x 1.25 – BMW F & G Series, Toyota A90 Supra
• M14 x 1.5 – VAG (Volkswagen, Audi, etc.)

Stud Lengths

• 68mm – Suitable for standard wheels (no spacer)
• 75mm – Suitable for no spacer or up to 12mm spacer
• 82mm – Suitable for up to 19mm spacer
• 90mm – Suitable for up to 27mm spacer

Nut Finish Options

• Black
• Copper

All options are interchangeable.

Installation Guide

Professional installation is recommended.

Tools & Consumables Required

• Thread chasing tool (size depends on vehicle)
• Penetrating oil (e.g., WD-40)
• Brake cleaner
• Clean cloths
• Wire brush
• Thread lock (e.g., Permatex 8179)
• Torque wrench (correctly calibrated) and suitable sockets

Installation Steps

Prepare the Hub & Threads

• Inspect the hub face and clean any rust or imperfections.
• Use a wire brush to remove corrosion.
• Clean the threads using brake cleaner, penetrating oil, and a thread chasing tool.
• Wipe down with a clean cloth to ensure no contaminants remain.

Prepare the Studs

• Spray each new stud with brake cleaner, then wipe with a clean cloth.
• Allow to dry for about 1 minute.

Test Fitment

• Manually thread a stud into the hub (using the short end) to ensure it does not bottom out prematurely.
• If unsure, measure the stud hole depth with a thin tool to confirm adequate space.
• Check each stud hole to ensure no debris or broken bolts remain inside.

Install the Studs

• Apply a small amount of thread lock to the tip and first 5mm of the stud’s smaller threaded end.
• Hand-tighten the stud into the hub.
• Use the double-nut method:
• Thread one nut halfway onto the stud.
• Thread a second nut against it, with the tapered sides facing each other.
• Tighten both together using a socket.
• Torque the stud to 32Nm using a torque wrench.
• Repeat for all studs.

Note: Thread lock takes 1 hour to set and 24 hours to fully cure.

Mount the Wheels

• Align the wheel onto the studs (no additional consumables needed).
• Tighten the nuts in a star pattern (tighten opposite nuts sequentially).
• Lower the vehicle and torque the nuts to 122Nm using a torque wrench.

Final Checks

• Re-torque after 100 miles (or after returning to the pits if used on track).

Why Upgrade to Studs?

Switching to Bimecc Stud & Nut Conversion improves safety, ease of installation, and reliability, making it a perfect choice for both daily drivers and track enthusiasts.

Now available in multiple sizes and finishes—find the right fit for your vehicle today!