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Legitimately getting a 42 between the chainstays needs the inside of the stay to be at least 25mm from centre. Fitting a road double chainset needs the outside of the stay to be no more than 37mm from centre. Do the maths. While Isen shouldn't be claiming that it can be done, there is some responsibility on the part of the customer to realise that if something looks too good to be true, it probably is.
https://timharford.com/2021/04/cautionary-tales-number-fever/