Horizontal Dual Mount Kit for Standard Bike Racks and Garmin, Magene, and GoPro (ST)

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This 3rd generation Bup mount for standard bike racks using our latest Shark Tooth (ST) connector.  It is designed to attach to any standard bike rack reflector or accessory mounting plate with standard hole spacing (see details below).  This kit uses our horizontal ST mount arm to securely position a Garmin Varia radar, Magene radar, GoPro, similar camera or light, or both at the same time, for optimal visibility and operation.  When used with a radar alone, this kit provides the maximum clearance for tight fits between a bike rack and the rear wheel.

Made in USA

Compatibility Features
  • Bike racks with an accessory or reflector mounting plate with standard 50 mm (2 in) on center holes
  • Garmin Varia models:
    • RTL510
    • RTL515
  • Magene L508
  • GoPro compatible cameras weighing up to 130g (4.6 oz)
  • Maximum combined device weight allowed is 200g (7 oz)
  • Not for use with extensions.
  • See details below before ordering
  • Lightweight (20g) and aerodynamic
  • Securely attached - cannot be removed without tools
  • Supports the use of one or two devices
  • Includes locknuts and Nyloc screws to help prevent loosening
  • Includes a safety tether kit for the radar and a separate heavy duty safety tether kit for the optional secondary device



Bike Rack Compatibility

This mount is compatible with bike racks that have a standard 50 mm (~2 in) on center accessory or reflector mounting base. If your bike rack does not have a accessory or reflector mounting plate, this mount will not work.
Required hole spacing
Required hole spacing



Optional Adapters

If your accessory plate is tucked under the back of the bike rack, you may need an adapter to lower it so the radars can be attached.  Similarly, if the hole pattern doesn't match, we make adapters for other bike rack manufacturers out of carbon fiber composites. If you don't see one that will work for your bike rack under Accessories, contact us for other options.
Required hole spacing
Required hole spacing
Usage rating 

This mount is intended for use with bicycles used on paved or relatively smooth unpaved surfaces. Our mounts can be used with electric bikes up to class 3. ASTM International standard F2043-13.


BUP Shark Tooth (ST)

What makes the Shark Tooth design different?

  • ST Mounts use toothed connections to prevent slipping.
  • Connections are very rugged and more than 3x thicker than GoPro type connections.
  • Very easy to assemble using the provided thread locking screws.
  • Eliminates the variations in GoPro like slot fitments for a more secure connection.

|---- Space ----|

  • Our mounts move the device down and rearward to increase spacing.
  • Bup mount positioning creates more leg over clearance for easier mounts and dismounts.
  • Leaves more than enough room for most small/medium and even some large bags.
  • Optional extensions can provide even more space when needed!

Safety is not an afterthought

  • Safety band prevents twist out release from impacts, aggressive riding, opportunistic theft, and accidents.
  • Safety bands will not interfere with, or mute, radar range or operation.
  • New elastic safety tethers are thin and exactly the same as the Garmin OEM computer tether.
  • Heavy duty safety tethers are provided with kits for heavier devices such as a GoPro or Garmin Varia RCT715.

Shark Tooth Grip

One huge benefit of the new Shark tooth design is preventing device rotation. Standard action camera connectors typically suffer from rotation under loading which requires overtightening the screw to overcome the rotation. Overtightening can eventually lead to damage or failure.

ST mounts use just one thread locking screw for easy assembly. Just tighten normally and it is locked in place. Easy peasy.

Have Your Cake And Eat It Too

Radar and a GOOD camera? Yes please! Extra room for big saddle bags? Yes please! Pick one or the other? Nope! Bup horizontal mount arms provide a huge amount of space below the saddle AND the option to run two devices at once!



Besides being able to use all major brands of radars, our ST mount arms can be converted from one brand's radar to another. Switching between Garmin Varia and Magene require nothing more than unscrewing the insert and moving a few plugs. Conversion from Garmin or Magene to Bryton (or vice versa) is almost as easy with an extra insert (sold separately).



Our mounts bases and arms are 3D printed with state-of the-art bioplastic materials using the most technologically advanced machines in the world. Even small injection molded items, such as the quarter-turn inserts, are top-of-the-line and as good or better than the OEM part.

Image: Cutaway of Bup quarter-turn insert on the left compared to the common import mount variety on the right.

Frequently Asked Questions

Our mounts are made from a new state-of-the-art material called bio-plastic that is derived from plants instead of petroleum. It is stronger than traditional plastic and able to withstand repeated impacts better. Some components are made from injection molded plastic or steel.

We source all raw materials, manufacture the primary components, assemble, and package the products in the United States. Some accessory items or minor components are imported (noted in the product details).

We currently ship within the U.S., most U.S. territories, and Canada. Please see the international shipping page for more details.

All BUP mounts are manufactured and hand assembled in the USA

Patent # US D902,014 S, D893,285 S

The Garmin Varia, Bryton radar, Magene radar, GoPro, saddle bag, and saddle are shown for illustrative purposes only and are not included.

This product is not affiliated with, endorsed by or in any way associated with GoPro Inc. or its products and services. GoPro, HERO and their respective logos are trademarks or registered trademarks of GoPro, Inc..
This product is not affiliated with, endorsed by or in any way associated with Garmin Inc. or its products and services. Garmin, Varia and their respective logos are trademarks or registered trademarks of Garmin, Inc.
This product is not affiliated with, endorsed by or in any way associated with Magene Inc. or its products and services. Magene and their respective logos are trademarks or registered trademarks of Magene, Inc.
This product is not affiliated with, endorsed by or in any way associated with Bryton Inc. or its products and services. Bryton and their respective logos are trademarks or registered trademarks of Bryton, Inc.