Topeak Zi:Rak Thru-Axle - SRAM UDH
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Product Information
Full details
The Topeak Zi:Rak Thru-Axle is a specialized component designed for cyclists using SRAM UDH equipped road and gravel bikes who need a secure, stable mounting point for Topeak Zi:Rack rear racks. This axle provides the necessary structural integrity for heavy-duty rack mounting while maintaining bike handling performance; however, users must verify their original axle pitch and follow exact spacer configurations to ensure proper compatibility with their specific frame geometry.
All features
| Model Part Number | TA2420-SP04 |
|---|---|
| Brand | TOPEAK |
Extended Product Information
FAQs
Is this axle compatible with non-SRAM UDH bikes?
No, this specific model is engineered exclusively for frames using the SRAM UDH system.
What is the total length of the axle?
The axle has a total length of 170mm.
Does this replace my original derailleur hanger?
No, this axle works in conjunction with your existing SRAM UDH hanger.
Can I use this with any rear rack?
It is specifically designed for the Topeak Zi:Rack range of rear racks.
Why does the weight vary between 50g and 60g?
The final weight depends on which spacers are required for your specific frame setup.
Do I need special tools for installation?
Standard hex or thru-axle tools are typically all that is required for installation.
Troubleshooting
Axle does not thread smoothly into the frame
Verify that the thread pitch matches your original thru-axle and ensure the SRAM UDH hanger is properly seated.
Rack feels loose or wobbles after installation
Double-check the spacer configuration to ensure the correct width is achieved for your frame dropouts.
Pros and Cons
Pros
- Perfectly compatible with SRAM UDH frame standards
- Provides a stable and secure mounting platform for rear racks
- Lightweight construction avoids adding unnecessary mass to the bike
- Includes adjustable spacers for versatile fitment
Cons
- Requires precise measurement of original axle pitch before purchase
- Specific to SRAM UDH systems and not compatible with all thru-axle standards
- Installation requires careful attention to spacer configuration
Setup, Compatibility & Care
Before installation, verify that your bike frame utilizes the SRAM UDH system. To install, remove your existing thru-axle and compare the pitch and total length. Use the provided spacers based on your specific bike’s manual instructions to ensure the axle length of 170mm and thread length of 20mm align correctly with your dropouts. Ensure the axle is tightened to your frame manufacturer's specified torque settings. For long-term care, lightly grease the threads periodically to prevent seizing and inspect the assembly after long tours to ensure no hardware has loosened due to vibration.