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IA4 - http://2015.feltbicycles.com/.../IA-Series/ia-4.aspx
IA FRD - https://www.feltbicycles.com/...ies/IA-FRD-2018.aspx
Didn't check every number but stack and reach are the same. IA2 doesn't have geo listed, but it looks like the same frame as the FRD.