We have over 500 bikes on file in our frame bag database - but if yours isn't in there, we just need one photo with a ruler to design a perfectly-fitting bag.
Precision-fit frame bags start with just a photo
Using photos for sizing is more accurate than a physical template, reduces our carbon footprint, and keeps our prices low.
We need the flat perspective that comes from distance - basically we want every part of the bike frame to be at the same distance away from the camera, so the scale is the same everywhere.
The only way to do this is to step back a minimum of 15 feet. If you have a nice camera you can step back 20-30 feet away for a more precise result.
Unfortunately, bike geometry charts don't have enough information about the frame triangle to make a bag.
Geometry charts are designed for rider-specific dimensions (like stack and reach), and they don't give any info about the inside of the frame.
Congrats on getting a custom frame! Whether a drawing works or not depends on the drawing - feel free to email it to email@example.com and we'll take a look.
One thing to note is that for some frame builders the CAD drawing is a guideline for geometry, but things like bolt locations or the exact placement of the top tube might change - check with your frame builder to see if that's the case.
Great question! Basically we use the ruler in your photo to scale the whole bike to life size in our magic lightning box (AKA computer).
Then we draw a frame bag template on top of that and print it out so it can be made into a real-life frame bag!
Back in the olden days we used to print each photo and do actual math to scale the triangle (boo!) - scroll down for an old-school example. Our current methods are much more civilized.
When we first started making custom frame bags back in 2014, the state of the art was to cut out a pizza box and mail it to your frame bag builder.
That seemed like a pretty silly process (it's the 21st century after all), so from the very beginning we started using photos instead of cardboard for our frame bags. It's better for the environment, easier on our customers, and produces better bags to boot.
8 years later our methods have evolved, but the basic steps are still the same - take a photo, send it to us, and wait for your bag to arrive!