A.

If you want to run any sort of chain retention device, you really do need a chain device mount. If you’re happy to rely on a narrow/wide chainring or are using a front derailleur, then you don’t need one. All of our chain device mounts are ISCG05, which is the current, slightly larger 3-bolt standard. ISCG-old chain devices look very similar, but aren’t compatible!

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No ISCG05 mount:

Blinder #083 Chain Stay Gussets
Blinder #083 Chain Stay Gussets

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With ISCG05 mount:

Belter #082 Chain Stay Gussets
Belter #082 Chain Stay Gussets

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