The OneUp ISCG05 Underbash adds chainring protection without an upper chain guide. It suits a compatible bike that already has its own guide, or a rider who wants bash protection without adding another retention device.
The compact two-bolt backplate carries a replaceable bash plate, with three sizes supplied for 28-36T chainrings. It can be installed without removing the crank, and 2.5mm of spacing adjustment helps clear the frame.
For frames with two ISCG05 tabs. If the frame has three tabs, obtain frame-manufacturer confirmation that the lower tabs can support a bash guard before fitting.
Not compatible with e-bikes.
Includes 28-30T, 32-34T and 36T bash plates.
7075 aluminium and glass-reinforced thermoplastic construction.
Manufacturer weight 68g with the 32-34T plate.
Boost and oval-ring compatible within its fit range; no upper chain guide included.
The Underbash protects beneath the chainring while leaving the top of the ring clear. That suits compatible frames with integrated retention or riders who only need a bash guard.
Match the bash plate to the ring
Three included plate sizes cover 28-36T chainrings. The replaceable plate lets you change the protection to suit the ring size without replacing the aluminium backplate.
