Originally Posted by
mstateglfr
On an older sport router, I have a triple front of 52-42-32 and a 7 speed rear HG50 thats 14-32.
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I am running a road triple with an aftermarket 24t granny. Photo shows my 52/42/24 triple with a 11/32 8 speed cassette.
The derailleur cage will not wrap up enough chain if I use the 24 front with 11 or 12 rear, but you do not have those rear cogs. Even if I could use them, I would not because it is severely cross chained.
The up shift from the 24 to 42 is not very smooth, but I can live with it. I use a chain catcher to prevent dropping the chain on the down shift to the 24.
You could try 24, 26 or 28 for a granny.