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Product Description

Adapter Thru Axle for Mounting Rear Racks

The Topeak Zi:RAK Thru Axle is an adapter thru axle with an integrated M5 thread on both sides. It allows you to mount a rear rack to frames that do not have factory threaded eyelets. The axle replaces the original rear axle with a shaft length of up to 170 mm, making it suitable for many gravel bikes. For mountain bikes with a wider rear triangle, please check the required length in advance. Thanks to the included spacers, the axle can be flexibly adjusted to the correct length.

Product Features:

  • Designed for mounting the Topeak Zi:RAK
  • Robust construction with high load capacity
  • Replaces the original rear axle up to 170 mm shaft length
  • Multiple spacers for individual length adjustment
  • Conical spacer compatible with X12 axles
  • Version compatible with SRAM UDH / Transmission
  • M5 thread integrated on both sides
  • Installation with 6 mm hex key

Thread Pitch (TP):

You can usually find the required thread pitch directly on your existing thru axle. It is typically marked with P or TP. Alternatively, you can determine the pitch yourself. A step-by-step guide is shown in the product images.

  • 1.00 mm
  • 1.50 mm
  • 1.75 mm

Thru axle measurement example

Shaft Length:

  • 170 mm without spacers (not suitable for mountain bikes with wide frames, please measure first!)
  • The minimum adjustable length using flat spacers is 159.5 mm (possibly minus the conical spacer)
  • With the included spacers, the length can be precisely adjusted to match your frame width. Additional spacers are available as accessories in our shop.
  • Your current shaft length is ideally printed on your original thru axle. You can also measure it yourself. Instructions can be found in the product photos.

Technical Specifications:

  • Shaft length: 170 mm (can be reduced using included spacers, see scope of delivery)
  • Diameter: M12
  • Thread pitch (TP): 1.00 / 1.50 / 1.75 mm (please select)
  • Thread length: 20 mm
  • Maximum load: 22 kg
  • Material (axle): Aluminum
  • Weight: 50 - 60 g (depending on number of spacers)
  • Manual: Download PDF file

Scope of Delivery:

  • 1 x Topeak Zi:RAK Thru Axle
  • 1 x Spacer 1 mm (flat)
  • 1 x Spacer 1.5 mm (flat)
  • 4 x Spacer 2 mm (flat)
  • 1 x Spacer 4 mm (conical)
  • 2 x Screw M5 x 16 mm
  • 1 x UDH bolt (only with SRAM UDH version)
  • Manual
Manufacturer
Topeak Inc
8F-4, NO.20, Ta Long Road Taichung, TWN
www.topeak.com
EU Representative
RTI Sports GmbH
Am Autobahnkreuz 7, 56072 Koblenz, GER
www.rtisports.de
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Bike-Packing Shop Gründer

Our family business is dedicated to traveling by bicycle. We want to offer products that help adventurous cyclists explore the world and achieve sporting goals.

Matthias und Peter
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Nature is very important to us. That's why we avoid unnecessary plastic and rely on packaging material made of paper or cardboard. If your package does contain plastic filling material, this is material from our suppliers which we have reused.