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Underbash Guard
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ISCG05 Underbash adds lightweight chainring protection with tool-free crank installation
What Our Gearhead® Experts Are Saying:
“I like this option for frames with integrated guides or riders who don’t want the bulk of a full bashguide. It’s extremely light, easy to set up, and the replaceable plates mean you’re not tossing the whole system after hard impacts.”
When a frame already manages chain retention, the OneUp Components ISCG05 Underbash delivers focused protection where it matters most. It’s built for riders who spend time in rocky terrain and want to safeguard chainrings without extra noise, drag, or complexity. The compact profile keeps ground clearance high while absorbing direct impacts from trail obstacles.
Construction centers around a CNC-machined 7075 aluminum backplate paired with glass-reinforced thermoplastic bash plates. Three included plate sizes support chainrings from 28–36T, and a 2.5mm chainline adjustment range allows fine-tuning for clearance across modern drivetrains. Stainless steel hardware resists corrosion, and the design remains compatible with Boost spacing and oval chainrings.
Details
- Mountain bike bash guard to protect chainrings and frames
- Includes 3 different sizes of bash plate to fit 28–36t chainrings
- Easy installation doesn't require crankset removal
- Compatible with round and oval chainrings
- Lightweight aluminum backplate with replaceable composite plates
- Adjustable chainline for frame and drivetrain clearance
- Item #OUC001G
- Material
- aluminum, glass-reinforced thermoplastic
- Mount Type
- ISCG 05 (2-bolt only)
- Chainring Sizes
- 28 - 36t
- Claimed Weight
- 2.4oz (68g)
- Activity
- downhill, enduro, trail