Drillium Four - Production.

This is a simple clean design with an added touch of style from the machine holes with small tidy chamfers.




I have this available in 144 BCD in 1/8 thick tooth.....This Production ring is available in anodised blackFine Brushed Silver and Polished.


This model is designed for mounting on the outside of your crank arms. The tooth profile is flush with the rear of the ring for the best chainline.


Note: Polished and Brushed Silver  are prepared after the you have ordered the ring, so may add a few days to the delivery time.



Size range for this model                                 

                                144 BCD.....45T  to  53T.


Anodised black or Brushed silver.

$79.00.....includes freight anywhere in Australia.



Polished finish.

$109.00.....includes freight anywhere in Australia.


I do ship chainrings worldwide.


To order I simply need the number of teeth, the BCD and the finish you are after and of course your name and an address to send it to.


Please contact me to order your ring or for a quote for delivery  outside of Australia.


The design of this ring is available in other custom sizes.   I am able to cut this design in most other bolt patterns that are available, there may be some restrictions because of the amount of detail , but please don't hesitate to contact me for a quote.


cnc machined bespoke track chainring design australian made chainrings fixie


Cycleunderground has been around for over 22 years.

A lot of customers are surprised to find out that it is a one man machining and fabrication shop.

My name is John Bosevski and I have been servicing, repairing bicycles and building  frames, tools and bits for bikes for over 30 years.

I now concentrate on my components and tools and slowly develop new product and tooling to increase my offerings.

I prefer to concentrate on the bespoke side of bicycles, putting my effort towards products and tools that have been forgotten or overlooked.

 My workshop can be found in Taren Point,  Sydney,  Australia.