Skip to product information
1 of 6

Concentric Cycling

Race Number Adaptor

Race Number Adaptor

Regular price $19.00 AUD
Regular price Sale price $19.00 AUD
Sale Sold out
Shipping calculated at checkout.

With a Concentric Cycling Race Number Adaptor, you'll always be ready for race day. Simply remove your tail light and replace it with your race number. No tools or rubber bands needed.

To use the adaptor, simply slide in your race number, click in the tool-free locking mechanism and insert/twist the holder into your Concentric Cycling Seat Post Mount.

When the race is over, you can replace your race number with your Radar, Camera or Tail Light in seconds, ready for the ride home.

Manufactured in Australia from Carbon Nylon for strength, durability and heat/UV resistance. Supplied with the 2-part locking mechanism.

Variants include adaptors for the following:

  • Garmin Varia RTL515/RVR315
  • Magene L508
  • Cycliq Fly6
  • Bontrager Flare RT
  • Cateye (Viz, Rapid, Reflext and Omni)
  • Giant Recon TL
  • Moon (Comet-X Pro, Nebula, Shield-X)
  • Moon Helix / MagicShine SeeMee (includes DV Camera)
  • Go Pro compatible accessories

And more coming soon...

Shipping & Returns

International Shipping

New Zealand - AU $7 flat rate

US / Canada / Asia Pacific - AU $10 flat rate

UK / Europe / Rest of World - AU $15 flat rate

Free standard shipping / discounted express shipping on orders over AU $100.


Domestic Shipping (Australia)

Standard shipping - AU $5 flat rate

Express shipping - AU $10 flat rate

Free standard shipping / discounted express shipping on orders over AU $100.


All orders are dispatched out of Perth, Western Australia. Delivery time varies depending on the location.

International orders may be subject to customs rates, please refer to your local customs office for information on duties payable.

Concentric Cycling is not liable for local duties, taxes or losses that may arise from a customer refusing to pay the relevant duties on a purchase.


Return Policy

We offer a 30 day return policy. If you are unhappy with your purchase for whatever reason, including change of mind, contact us within 30 days of making your purchase, and we will happily issue a replacement or refund.

To be eligible for a return, your item must be unused and in the same condition that you received it. Partial refunds may be granted at the discretion of Concentric Cycling whereby these conditions are not met.


Return Shipping

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.



Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment.


We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at

Care and Installation Instructions

Carbon Nylon is a strong, durable and heat resistance material, however it can be worn down over time from unwanted abrasion. To ensure a long life for your mount, we recommend cleaning your bike light and mount after a wet and dirty ride. Particular attention should be given to remove any sand/grit from the interface between the mount and your light.


To ensure a perfect fit of your Concentric Cycling product, please follow these recommended installation instructions:


Seat post mounts

1. Remove the nut and bolt from the assembled mount using a 2.5mm hex key.

2. Carefully flex the seat clamp open and fit it around the seat post.

3. Position the seat clamp in the desired position (e.g. at the base of the seat post).

4. Pre-install the bolt into the seat clamp (drive-side of the bike).

5. Place the light mount into the opening, and commence threading the bolt into place using a 2.5mm hex key.

6. Before threading the bolt through the other side of the seat clamp, place the lock nut into position and hold.

7. Slowly thread the bolt through the non-drive side of the seat clamp and into the lock nut until it is hand tight (max 1.5nm).

8. Do not over tighten or assemble at high speed as this may result in galling of the metal parts and/or damage to the lock nut.


Saddle mounts

 1. If using an Apple Airtag model, place the Airtag into the base plate and pivot the cover plate into position starting from the clip side.

2. Position the mount below the mounting points on your saddle

3. Install the bolts through the mounting points and screw them into the saddle until hand tight (max 1.5nm).

4. Remove the M5 bolt and lock nut from the GoPro mount, being careful not to drop them.

5. Insert your chosen accessory or GoPro adaptor, and reinstall the M5 bolt and lock nut until it is loosely in position.

6. Adjust the GoPro adaptor to your preferred angle.

7. Tighten the M5 bolt until it is hand tight (max 1.5nm).

8. Do not over tighten or assemble at high speed as this may result in galling of the metal parts and/or damage to the lock nut.


Race number holder / adaptor

1. Slide in the race number

2. Insert the fixing through the race number and holder

3. Click in the locking mechanism

4. Twist/slide the race number holder into your Concentric Cycling Seat Post Mount


Head unit mounts

1. Thread the bolt into either the GoPro or Blank attachment

2. Position the GoPro or Blank attachment into the head unit mount and proceed to screw the bolt into the front integrated fitting on your handlebar until loosely in position

3. Position the rear bolt into the adjustable area and screw into the rear integrated fitting on your handlebar, again until loosely in position

4. Tighten the bolts using a torque wrench to max 2.0nm

5. If using the GoPro attachment, insert your chosen accessory and thread the bolt into the lock nut until it is hand tight (max 1.5nm).

6. Do not over tighten or assemble at high speed as this may result in galling of the metal parts and/or damage to the head unit mount and attachments.

*Note that selected mounts (Cervelo S5 / BMC ICS) include shims which should be used to further refine the position and angle of your head unit. These should be placed between the head unit mount and the handlebars with the textured surfaces pressed together.

View full details

Customer Reviews

Based on 5 reviews
Best customer service ever

The item was quickly received and I can see much thought has been put to designing the mount. It looks sleek , definitely making my bike look nicer.
Although there was a little issue with the way my Cycliq attaches to the mount, it was quickly resolved. A replacement piece was sent almost immediately and now it’s working flawlessly!
2 thumbs up for design, price and customer service!

John P.
Best race number adapter out there!

This piece works perfect with their Garmin mount. Really cleans up the bike! I would buy it again!

Nicky R.
Pure genius! Fits like a glove!

Done with clunky race number holders that scratch my seat post! This is a genius invention is one thing less to not worry about before a race (awesome!). Fits perfectly!

Nathanial B.
Bontrager RT plate adapter

Looks good. Doesn't really lock into place on the strap attachement.

Hi Nathanial. We are sorry that the Race Number Adaptor for the Bontrager RT did not meet your expectations. When designed and tested this works perfectly for us, so we will be in touch by email to understand why this is not working for you. Thanks!


The best communication and reply my email within one day and item arrived fast with good packaging and the product as described and fits my SL8 well