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Replacement cap for Park Tools DP-2 dummy pedal

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Creation's quality: 5.0/5 (1 vote)
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  • 11 downloads

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Update - 20 Sep 2019: I uploaded a v3 version with even longer threads with a nice taper for when your hamfisted coworkers in the shop keep stripping out the v2 version with the shorter threads. ಠ_ಠ Unfortunately I can't upload a version to make coworkers less hamfisted.

Update - 10 Nov 2018: I uploaded a v2 version with longer threads for when your hamfisted coworkers in the shop keep stripping out the original version with the shorter threads. ಠ_ಠ

Park Tool's DP-2 dummy pedal tool is a simple tool that threads into the 9/16-20 threads on a bicycle crank so you can turn the drivetrain when a bike doesn't have pedals installed. The head is plastic, and a hamfisted mechanic (which wasn't me, honest) can easily strip the threads, especially since there's only a couple threads. (This makes it easier/quicker to attach the tool, you don't have to thread it all the way into the cranks)

If the cap gets stripped out, the tool becomes worthless. According to the tool's instructions PDF it looks like you can order part #898 as a replacement, but since it's such a simple part, you could just print up as many replacements as you need.

This thing is just that replacement, modeled to directly replace the #898 head of the DP-2. The threads are 5/16"-18tpi (not sure why Park uses SAE threads here as bikes are predominantly metric) and the nylock nut is 1/2", but a 13mm cone wrench works well. Hold the nylock nut with a cone wrench, and the cap will thread off, although you may find it easier to hold the cap in a vise or with channel-lock pliers as it fits pretty tightly.

The original part has a cutout in the back into which the nylock nut fits, but I don't see much in the way of functional improvement in that. Removing the cutout makes it easier to access the nylock nut with a conventional open-end wrench, and allows the thing to be printed without supports.

I also have a complete redesign of the PD-2 which is optimized for printing on FDM printers here: Dummy pedal for bicycle maintenance - redesign for FDM printers

  • 3D file format: F3D and STL
  • Publication date: 2020/01/30 at 01:47

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CC BY NC SA

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Note: I wanted to try Cults3D as a possible alternative to Thingiverse, but after giving it a bit of a look, I'm not super impressed. Feel free to visit my Thingiverse page if they can manage to keep that site running:

https://www.thingiverse.com/cmh

I went to school as a mechanical engineer, and got interested in 3D modeling, specifically the SDRC I-DEAS CAD/CAM software system. This interest got me my first job working for a CAD/CAM reseller doing pre and post-sales support. I was lucky to be involved in 3D printing in the early 90s - for a demo of rapid prototyping, I modeled the mouse from my HP-UX CAD workstation and it was rendered via stereolithography. I still have that model, but across the years I stopped using CAD and moved to systems administration. Now that 3D printing is affordable and mostly reliable, I've gotten into it and am having a blast. I printed all the usual cute little trinkets and tchotchkes, but quickly got bored of that. What I find most interesting is needing something, then spending a little bit of time in a CAD program and soon after that having a real, functional version of the part in my hand.

I'm a cyclist and bike mechanic as a hobby and a side job, and have found endless applications of 3D printing to both bikes and bike maintenance. Coworkers have also come to me with many varied requests, each of which has been an interesting challenge and an opportunity to learn.

I am constantly learning, constantly trying to challenge myself to learn new things and technologies, so hopefully as I progress my designs will continue to improve.

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