Shimano SM-AX56 E-Thru Rear Hub Thru Axle - 142mm x 12mm
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Product Information
Full details
The Shimano SM-AX56 E-Thru Rear Hub Thru Axle is designed for cyclists running 142mm x 12mm rear dropouts who prioritize a secure, tool-less wheel retention system. It offers a reliable internal cam lever mechanism that ensures consistent clamping force, making it an ideal choice for mountain and gravel riders; however, it is strictly limited to frames with 142mm spacing and an M12 x 1.5 thread pitch, meaning it will not fit Boost (148mm) or non-standard thread configurations.
All features
| Model Part Number | SM-AX56 |
|---|---|
| Brand | SHIMANO |
Extended Product Information
FAQs
Will this fit a Boost 148mm frame?
No, this axle is strictly designed for 142mm spacing.
Can I use this on a non-Shimano hub?
As long as your frame and hub support the 142 x 12mm standard with an M12 x 1.5 thread pitch, it should function correctly.
Do I need any tools to install this?
No, the internal cam lever allows for completely tool-less installation and removal.
What is the total length of the axle?
The total length is 171mm with a 15mm thread length.
How often should I grease the axle?
It is recommended to clean and lightly re-grease the axle threads every few months or after riding in particularly muddy or wet conditions.
Troubleshooting
Axle is difficult to thread into the frame
Clean the threads on both the axle and the frame, then apply a small amount of fresh bicycle grease.
The lever does not feel secure when closed
Open the lever, tighten the adjustment nut slightly, then re-close the lever to check for increased tension.
Pros and Cons
Pros
- Tool-less operation simplifies trail-side wheel changes
- Consistent and secure clamping force via internal cam
- Lightweight hollow-body design
- High-quality Shimano build and reliability
Cons
- Not compatible with Boost 148mm spacing
- Specific thread pitch (M12 x 1.5) requires matching frame threading
- Requires proper lever tension adjustment for best performance
Setup, Compatibility & Care
To ensure proper fitment, verify that your bike frame utilizes 142mm x 12mm rear spacing and an M12 x 1.5 thread pitch. Before installation, lightly grease the threads and the cam mechanism to prevent seizing and ensure smooth operation. When inserting, thread the axle into the frame dropout by hand until it seats properly, then flip the lever to the closed position. If the lever closes with too much resistance or feels too loose, adjust the tension by rotating the lever nut while in the open position. Regularly check the axle for debris and ensure the lever stays free of grit to maintain smooth functionality.