Minimalist chain keeper

Should work for a bunch of frame/chainring combinations. You can swing the keeper about the mount to accommodate different chainring sizes.

Customizable with the following parameters:

• Chainline: default is 50 mm
• SeatTubeDia: default is 34.9 mm

Edit these two parameters to get the proper stickout from your frame to the chainring. I recommend measuring it manually (see Sheldon Brown).

How I Designed This

Inspired by the Canyon chain keeper included with the Lux CF SLX 9.0 (https://www.bikeradar.com/us/mtb/gear/category/bikes/mountain-bikes/full-suspension/product/canyon-lux-cf-slx-90-pro-race-review-52081/).

Credit goes to Plamen Cherkezov for creating the frame model & Morar Adrian for the SR Apex crankset model, over on GrabCAD.

Pictures from BikeRadar & PinkBike.

Hardware

Designed for two M4 x 20 socket head cap bolts & two M4 locknuts (7 mm width by 5 mm height).

You'll also need an M5 x 20 countersunk head bolt to attach the keeper to the mount, & a corresponding nut (8 mm width by 5.2 mm height).