There are a few different types of bottom bracket mounting holes - ISCG 03, ISCG 05.
Aluminum Alloy Chain Guard, Durable ISCG 05/03 22T-46T Chainrings Frame Protector, Prevent Chain Drop, Lightweight for Mountain Bike Riders, Road Bikers, and Urban Cyclists
FNFTOEZGY Compatible for TOSEEK MTB Chain Guide Guard, Ultralight Single Disc Sprocket, 32T-38T Fit ISCG-03/ISCG-05/127(Black)
For Bicycle Chain Guide, Mountain For Bike Chain Protector, ISCG 03 Mount, ISCG 05 Interface, Single For Ring Guard, 32T To 38T Compatibility, For
Mountain For Bike Chain Guide Single Speed Chain Protector ISCG 03 Chainguide ISCG 05 Guard DH Downhill Keeper Aluminium Alloy Device 32T 34T 36T 38T Single For Ring(Black)
Bike Chain Guide Adapter MTB 1X System ISCG 03 ISCG 05 Bottom Bracket Conversion
Mountain For Bike Chain Guide Single Speed Chain Protector ISCG 03 Chainguide ISCG 05 Guard DH Downhill Keeper Aluminium Alloy Device 32T 34T 36T 38T Single For Ring(Purple)
