ISCG bash guard

Simple bash guard to mount to frames with ISCG05 mounts. Second and third photos show the aftermath of a pretty hard hit on a large rock in Bear Brook state park in NH - it definitely works!

Various sizes to clear different chainrings ranging from 28t to 38t. Two designs of each, one for standard M6 screws - I use round head M6 screws and they clear the chainring with no problem. A second design has the bolt holes chamfered to work with flat head M6 screws.

Please note: this was designed for and tested on a 2019 Trek Fuel EX 9.9 with a 32t SRAM GX Eagle chainring. While it probably should work on other bikes/chainrings, I have no idea if it will.

Design is parametric and the F3D file is included. Set the chainring teeth under "Modify... Change Parameters" from anything 28t or larger - 26t runs into interference issues with the front bolt hole and the bash guard itself.

The "47" text in the photos is my own thing which is removed from the posted files. If you want to add your own text, it's in the F3D file, just need to edit Sketch2 and unsuppress Extrude7.

For a similar design, see: Bike Bash Guard for ISCG05 tabs by Drazen. I originally had provision for using all three tabs but didn't see the point of using the top bolt.

Print instructions

Category: Sport & Outdoors Summary

Simple bash guard to mount to frames with ISCG05 mounts. Second and third photos show the aftermath of a pretty hard hit on a large rock in Bear Brook state park in NH - it definitely works!

Various sizes to clear different chainrings ranging from 28t to 38t. Two designs of each, one for standard M6 screws - I use round head M6 screws and they clear the chainring with no problem. A second design has the bolt holes chamfered to work with flat head M6 screws.

Please note: this was designed for and tested on a 2019 Trek Fuel EX 9.9 with a 32t SRAM GX Eagle chainring. While it probably should work on other bikes/chainrings, I have no idea if it will.

Design is parametric and the F3D file is included. Set the chainring teeth under "Modify... Change Parameters" from anything 28t or larger - 26t runs into interference issues with the front bolt hole and the bash guard itself.

The "47" text in the photos is my own thing which is removed from the posted files. If you want to add your own text, it's in the F3D file, just need to edit Sketch2 and unsuppress Extrude7.

For a similar design, see: Bike Bash Guard for ISCG05 tabs by Drazen. I originally had provision for using all three tabs but didn't see the point of using the top bolt.

Print Settings

Printer Brand: Prusa

Printer: i3 MK3

Rafts: No

Supports: No

Resolution: 0.2

Infill: 100%

Filament: Prusa PETG orange
Notes:

Print it solid, even at a high-ish infill my prototype broke with a good hit. The one I printed solid (100% infill) took a much bigger hit and just got scuffed.

Could probably be done with PLA with good results, but I printed in PETG.