Since the adapter isn’t included in the RRP Screw-On Mini kit, I set out to find one that would fit my RockShox Lyrik. Unfortunately, this adapter is rarely available and typically sells online for 10 euros—plus another 10 euros for shipping… and I’m cheap.
This custom design fits perfectly on the back of the fork crown and uses the RRP bolts provided with the original kit.
Only one extra M3 bolt and two M4 nuts are required.
Shine Bright! I bought a Varia almost a year ago, but I wasn’t a fan of the elastic straps used to secure the bulky mount to the seat post. So, I designed a custom 3D-printed holder that fits perfectly with the original Garmin interface — or the Mr. Control Garmin adapter I had lying around in my spare parts bin. The design is tailored to fit the back of the 10mm offset BMC Teammachine SLR seatpost. The lower bolt tightens against the saddle clamp hardware, ensuring a secure and stable attachment.
I printed the part using PLA on my trusty Creality Ender 3. The hardware shown is temporary, as I plan to upgrade to sleek stainless steel bolts and nuts, replacing the standard ones pictured here.
The final version assembled on the seatpost and its design in the background.
3D assembly in OneShape
Sub-assembly showing the Garmin Varia interface fitted into the 3D printed part
At work, I often need to quickly check the chainline of a crankset assembly. The ChainLineR is a simple gauge designed to make this process faster and easier, allowing you to measure your bike’s chainline and verify if it’s within the recommended specs for Shimano, SRAM, or Campagnolo.
The model
The 3D print
On a fixed gear bike
On a road bike with 2x crankset
While you can use a caliper to do this, it can be tricky to find a clear reference point to identify the center of the seat tube (e.g., the bottle cage bolt). The V-shaped design of the ChainLineR allows you to quickly center it on the seat tube or downtube, providing a rough but reliable reading of your chainline using millimeter markings.
An additional stopper allow you to place a ruller and get a more accurate read.
How to use:
Position the ChainLineR on any symmetrical part of your bike—ideally the seat tube or downtube.
Use the millimeter markings to read the chainline measurement.
Notes:
Some tubes may be asymmetrical.
The chainline for 2x setups is measured differently depending on the manufacturer. For example, Shimano measures from the inside of the larger chainring’s teeth.
