Replacement/upgrade arm for Gamut guides. 2-arm Boomerang for lightweight racing applications . BB: bottom bracket mount. ISCG: 59.2mm-BCD 3-tab direct-mount bottom bracket shell with adaptor included. ISCG-05: updated/larger 73mm-BCD 3-tab direct mount bottom bracket shell (works with standard BB, oversized BB, and BMX/American-BB shells). G45/P40 fits: max 40t chainring. G25/P20 fits: max 34t chainring.
Additional Information
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| Mount Type | ISCG |
| Terrain | Mountain |