Cycling accessory for indoor training that converts thru-axle bikes for secure trainer mounting, Laroal Bicycle Trainer Thru Axle Shaft Adapter promises a reliable rear-hub fit for mountain and road bikes. Reduced faff leads to steadier, more productive indoor sessions. Is the adapter the simplest way to ready your bike for regular trainer use?
⚡ At a Glance
- • Compatibility Range: Rear hubs 12x142–148mm with P1.5 or P1.75 threading, adjustable with included spacers
- • Best for: Cyclists who want to use mountain or road bikes on indoor trainers
- • Not ideal for: Bikes with axle widths or thread types outside the 12x142–148mm P1.5/P1.75 range
Converts thru-axles to an M12x1.5 trainer-compatible shaft with a 19.5cm length. Includes three aluminium spacers for fine width adjustment.
Stable Trainer Mounting - With M12x1.5 Threading and 19.5cm Length
M12x1.5 threading screws directly into compatible rear hubs while the 19.5cm shaft spans axle width to engage trainer mounts securely. The threaded connection prevents lateral play under pedalling force.
A firm rear-hub attachment reduces wobble during sprints and heavy efforts, so indoor intervals feel stable and predictable.
Widely Adjustable Fit - Thanks to Three Aluminium Spacers and 12x142–148mm Compatibility
Three aluminium spacers of differing thickness allow incremental adjustment to match hub widths across the 12x142–148mm range with P1.5 or P1.75 threads. Spacers sit between the hub and shaft to dial in a snug fit.
Quickly adapt the shaft to multiple bikes, making swaps between a mountain bike and a road bike straightforward and repeatable.
Durable, Lightweight Construction - With Premium Aluminium Alloy
Premium aluminium alloy balances strength and low mass, resisting corrosion from indoor humidity while keeping added weight minimal. The material choice supports repeated installation and removal without deforming threads.
A robust, light shaft stays reliable through regular training sessions and is easy to handle when changing bikes.
✨ The 4 Key Reasons for Laroal Bicycle Trainer Thru Axle Shaft Adapter
- Rapid setup - Cuts downtime so training sessions start sooner
- Secure mount - Keeps the rear hub steady during high-power intervals and sprints
- Fine adjustment - Allows precise spacing tweaks for a snug hub fit every time
- Lightweight aluminium - Adds minimal mass while remaining corrosion resistant for long use
📋 Technical Details at a Glance
- Category: Bicycle trainer thru axle shaft adapter
- Compatibility: Rear hubs 12x142–148mm, P1.5/P1.75 threading
- Threading: M12x1.5
- Length: 19.5 cm
- Spacers included: 3 aluminium spacers of varying thickness
❓ Frequently Asked Questions
Q: Will this fit my bike?
A: If the rear hub measures 12x142–148mm and uses P1.5 or P1.75 threading, the shaft is compatible and designed to convert the axle for trainer use.
Q: What are the aluminium spacers for?
A: Three spacers of different thicknesses let you fine-tune the effective hub width, ensuring a secure fit across slightly varying rear hub dimensions.
Q: Is installation difficult?
A: M12x1.5 threading and a 19.5cm shaft length are intended for straightforward screw-in installation, allowing a secure attachment to most compatible rear hubs.
🏆 Our Verdict
The Laroal Bicycle Trainer Thru Axle Shaft Adapter is well suited to riders with 12x142–148mm rear hubs who want a reliable way to use mountain or road bikes on indoor trainers. Adjustable spacers and M12x1.5 threading deliver a secure, repeatable conversion that stands up to regular training. While personal budgets vary, the straightforward design and durable aluminium build offer sensible long-term value for frequent indoor cyclists.
