Idler User Info

V3 idler documentation

Thanks for your purchase of a Jank Idler! This idler kit is built to last the lifetime of your bike given proper care. The modular design means that you won't have to purchase a replacement for the whole idler. Instead you can replace parts as needed.

Installation is simple!

Replace your stock idler, spacer (druid v1) and mounting bolt with the supplied parts and you're ready to go.

Spare chainrings can be purchased from SRAM for ~$20usd if you do manage to wear out the forged steel chainring. 

Bearing Size: 3802  (15mm x 24mm x 7mm)

Hardware Size: T20 Torx M4x10

Torque Specs: 5 Nm (be sure to torque screws evenly)

Update July 2026: Added a retaining clip for the bearing and removed the rear o-ring seal

Screws and bearing are to be assembled with appropriate retaining compound. For disassembly, if you are struggling to get something undone, a light amount of heat can help. Don't torch it, put it in the oven with your pizza or something. Keep it janky!

Drag/ Weather sealing o-rings

Update July 2026: Added a retaining clip for the bearing and removed the rear o-ring seal

The V3 idler kit has the option to use an extra o-ring seal in the mounting bolt and on the back of the carrier (older versions). 

Mounting and chainguide information Druid v1

The Jank idler spacer and mounting hardware are to be used with the stock upper guide, or Jank OneUp chainguide adapters. 

The Jank idler spacer and the stock forbidden mounting bolt are to be used with the Jank race guide or V2 Forbidden Race Guides. 

 

Mounting Information Druid V2

Please refer this this document for orientation and chain guide information for Druid V2

https://forbiddenbike.com/wp-content/uploads/2023/12/Druid-V2-52_55mm-Modular-Mounting-System-v2.pdf

If you have any further questions please reach out to info@jankcomponents.com or send us a DM on Instagram @jankcomponents