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OneUp Components
Underbash Guard

5 out of 5 stars
2 Reviews

Style & Size:


Why We Like The Underbash Guard

The OneUp Underbash Guard mounts to our mountain bike's ISCG-05 tabs and protects our chainring and bike frame from impact damage. It's designed for frames with a 2-bolt ISCG-05 mount such as Evil and Rocky Mountain. If your frame has a 3-bolt ISCG-05 mount, OneUp recommends contacting your frame manufacturer to see if it's compatible.


  • Mountain bike bash guard to protect chainrings and frames
  • Includes 3 different sizes of bash plate to fit 38 - 36t chainrings
  • Easy installation doesn't require crankset removal
  • Compatible with round and oval chainrings
  • Item #OUC001G
aluminum, glass-reinforced thermoplastic
Mount Type
ISCG 05 (2-bolt only)
Chainring Sizes
28 - 36t
Claimed Weight
2.4oz (68g)
downhill, enduro, trail

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

April 9, 2024

Great quality Easy installation

I've used it once or twice and have initial impressions

I didn’t realize I needed a bash guard until I damaged my chain. The OneUp guard is a quality piece. Very sturdy and includes three different guards for different chainring sizes. Installation was straightforward and easy. The included spacers made for a perfect fit on my trail bike. The two bolt design works well with the factory mounted chain guide. Highly recommend.

user image
Fritz F
5 out of 5 stars

August 9, 2023

Easy to install and solid

I've used it once or twice and have initial impressions

OneUp products are solid, haven’t had the time to hit it yet, but at least gives me some sort of piece mind. Installations was easy and I don’t know much about anything other than riding, thanks YouTube.

Juan F

Originally reviewed on