Mono-Cup Information

The current range of arm cup lengths I offer spans from 75mm to 240mm. When selecting your preferred length, please use that measurement for the instructions below. If we’ve already discussed the optimal length for your setup, you can go ahead and use that. If you're unsure or need guidance on choosing the right length, feel free to reach out for assistance.

The arm cup sides are designed to provide optimal support, with a height of 80mm at the rear and 60mm at the front. This design offers stability for your forearms while allowing functionality. However, these heights are adjustable if you prefer a different configuration. Feel free to let me know if you'd like the heights customised to better suit your riding style or comfort needs.

Currently, the arm cup spacing is set to 15mm from cup to cup, providing a narrow and aerodynamic setup. However, if you need a wider configuration, keep in mind that when the arm cup width exceeds a certain threshold, the part will be made in two pieces that join together. This ensures a strong, stable fit even at larger widths, while still allowing for flexibility in setup.

When the arm cup width exceeds a certain threshold, there are several factors to keep in mind:

  • Increase in Material Use:
    As the arm cup width increases, more material is required to ensure the strength and durability of the mount. This may slightly affect the overall cost and weight of the product.

  • Design Requirements and Time:
    Wider setups often require additional design adjustments to maintain structural integrity and performance. This can result in increased design time to ensure that the larger arm cups fit securely and provide the desired level of support.

  • Printing Complexity:
    With a wider arm cup setup, the printing process becomes more complex. In some cases, the part may need to be printed in multiple pieces that are joined together. This adds extra steps to both the production and assembly processes, extending the time needed to complete the print and final product.

If you're considering a wider configuration, feel free to discuss it with me, and I can walk you through the options and implications.

You’ll Need to inform me of the type of fit:

Snug Fit:
A snug fit will be a tighter fit, meaning the arm cups will hold your forearms more securely. One of the benefits of this fit is being locked into the cockpit, which can improve handling and give you better control, especially during aggressive or high-speed rides. It’s ideal for riders who prioritize stability and positioning.

Spacious Fit:
A spacious fit provides more room for movement in the arm cups. This allows for a more relaxed position, giving your arms the ability to shift slightly during longer rides, which can improve comfort for endurance events. This fit is typically preferred by riders who want less restriction and more flexibility in their positioning.

To proceed, I'll need the following measurements and details from you:

Forearm Circumference:

  1. Step 1: Measure the circumference of your forearm at the elbow. Use a measuring tape or a soft tape/ruler, ensuring it wraps snugly around your forearm without compressing the skin.

  2. Step 2: Next, measure the circumference of your forearm again, this time at a distance of XXXmm (this corresponds to the length of your chosen arm cup) along your forearm from the first measurement point at the elbow.

    NOTE: When taking both measurements, ensure your arm is positioned as it would be when resting naturally in the arm cups. This will help provide a more accurate fit for your setup.

Reference Photo and Bolt Size:

Measure the distance from the centre of one arm cup bolt to the centre of the corresponding bolt on the opposite arm cup. Ensure the measurement is as precise as possible to ensure a proper fit.


I’ll need a reference photo similar to the one I’ll attach below. Before taking the photo, please remove the arm cups so I can clearly see the mounting points. This will help ensure an accurate fit for your setup.

Additionally, I’ll need:

  • The bolt Diameter (thickness) for the arm cups. This is typically either 4mm, 5mm or 6mm thick (Diameter), but please confirm the exact size for your setup.

Bar Pitch (Angle):

Please provide the pitch (angle) of your bars, specifically the angle of the surface where the arm cups rest. For the most accurate measurement, it’s best to take this with both wheels on the ground, simulating your actual riding position. If you're unsure how to measure this, don’t hesitate to reach out for assistance.

If you’re using an iPhone, you can easily measure the angle with the built-in tool, which you can find here: iPhone Measurement Tool

Bottle Mount Height:

While positioned on the trainer with your current arm cups installed, measure the distance from the bottom of the arm cups to where the bottom of your bottle cage should sit. This measurement doesn’t need to be exact; an approximate height will be sufficient to ensure proper placement. If it’s easier, you can also just take a photo with a ruler or tape measure in place, and that will work just as well. If you need any help with this, feel free to call or message me anytime.

Additionally, please let me know if you prefer your mount to be capable of holding a single bottle or dual bottles between the arms.

  • Single Bottle Mount: Ideal for riders who only need one bottle between the arms for hydration.

  • Dual Bottle Mount: Designed for those who prefer extra hydration, allowing space for two bottles to be mounted securely between the arms.

Once I have all the necessary details, I’ll be able to finalise the model and provide you with a price. If you have any customisation requests or specific preferences, feel free to let me know, and I’ll be happy to accommodate them. If you have any issues or need any help, just reach out. I'm always happy to help!

You can submit all your measurements and details through this form: MonoCup Measurements Form