OneUp OneUp ISCG05 Underbash Guard
OneUp OneUp ISCG05 Underbash Guard

OneUp ISCG05 Underbash Guard

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If you're not looking for chain retention or your bike has an integrated chain guide, you can still add some bash protection with the OneUp ISCG05 Underbash.

The Underbash includes 3 different sizes of bash plate for compatibility with chainrings from 28-36T. Designed for frames with 2 ISCG05 tabs only (Evil, Rocky Mountain, etc). Should not be used on frames with 3 ISCG05 tabs.



  • Install without removing your crank
  • Single tool install and adjustment
  • Boost compatible
  • Oval Compatible
  • Stainless Steel hardware 
  • Includes 3 bash plates (28-30T, 32-34T, 36T)


  • Weight:  68g 32-34T
  • Capacity: 28-36T 
  • Chainline: 2.5mm adjustment 
  • Mount: ISCG05 2-Bolt ONLY
  • Color: Black
  • Material: 7075 aluminum, glass reinforced thermoplastic



1. Hold backplate directly against ISCG05 tabs. Check for clearance between the back side of the bashplate and the bike frame (use included 2.5mm spacers if necessary to space the backplate away from the frame).
2. Rotate backplate to desired location and torque bolts to 5Nm


1. Remove Underbash from bike
2. Remove bolt retaining clip from rear bash plate bolt by pushing a 4mm hex through the bolt from the backside of the Underbash.
3. Remove Bash bolts using a 5mm hex
4. Select desired bash plate and reinstall bash bolts to 6Nm
5. Reinstall bolt retaining clip on the rear bash plate bolt
6. Reinstall Underbash onto bike 
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