Triathlon Bike Number Mount

Mount to attach your race number to your bike for triathlon or bike racing. Tucks neatly behind the seatpost, a lot cleaner looking than wrapping around with double stick tape. Guaranteed to save you
3 seconds per mile on the bike leg...

Weighs 8 grams

Fits 30 mm seatpost diameter. You can modify the 123D clip model for a different diameter if needed.

Hope you find it useful. If you print and use, please consider posting a picture in the Make section, I'd love to see your setup. Thanks. Matt

Triathlete? Check out my Triathlon Aero Bottle Clip too.

Print instructions

Category: Sport & Outdoors Summary

Mount to attach your race number to your bike for triathlon or bike racing. Tucks neatly behind the seatpost, a lot cleaner looking than wrapping around with double stick tape. Guaranteed to save you
3 seconds per mile on the bike leg...

Weighs 8 grams

Fits 30 mm seatpost diameter. You can modify the 123D clip model for a different diameter if needed.

Hope you find it useful. If you print and use, please consider posting a picture in the Make section, I'd love to see your setup. Thanks. Matt

Triathlete? Check out my Triathlon Aero Bottle Clip too.

Print Settings

Supports:

Not required

Resolution:

0.3mm layers

Infill:

Solid

Notes:

The clip prints clean standing up with the axis of the curve vertical.

The post is a bit more challenging with a 1mm slot 10mm deep. The part is the strongest printed laying flat. If you have a great printer tuned-in tight print model tri_bike_number_post.stl standing up like a "T" with the slot opening up and supports under the solid part.

My printer isn't quite good enough to do that so option 2 is to print model tri_bike_number_post_and_support.stl laying flat. This model has supports included. You'll need to trim them back out carefully. I ground the blade off an X-acto knife to a square edge to use there. This works pretty well and you end up with a really strong part.

Post-Printing

Trimming supports using square ground X-acto blade

Putting it all together

Uses 3mm and/or 3.5mm wide zip ties - small or medium available from your local hardware. Cleanest set up is to use 3mm white ones for attaching the number (like the small ones from GB 50098, http://amzn.com/B00004WLJ9) and 3.5mm black to attach to the bike (like GB 46-308UVB, http://amzn.com/B00004WLJ4).

To use:
1\ Peel and stick the adhesive strips on your race number together to make it flat.
2\ Slip the number into the slot.
3\ Poke through the paper number where the zip tie holes are.
4A\ Use one zip tie per size and wrap it around the post. Cut off the excess.
4B\ Or... for a cleaner mount use 2 zip ties for each hole.
Poke one through the hole.
Thread the pointed end through the second zip tie on the other side.
Cut the excess off both.
You end up with the little box end of the zip ties on either side of the hole, no strap.
6\ Assemble the post into the slot on the clip.
7\ Put a zip tie through the hole in the clip to hold both together.
8\ Locate on your bike where you want it. The post is offset so flip it top-to-bottom if it fits better.
9\ Zip tie in place.
10\ Cut the excess off the zip tie.
11\ Go PR on the bike leg at your race.

Zip tie number to post, trim excess

Number attached.

Clip attached, ready to mount to bike

Attach to seatpost