If you know the chainstay length, you can calculate it here: http://www.machinehead-software.co.uk/bike/chain_length/chainlengthcalc.html
126 will cover you up to about 500mm chainstay length
435mm for the 19" according to Stanton's website.
That calculator suggests "Recommended length = 56 inches or 56 links" so dunno wtf is going on there.
56 inches or 56 links" so dunno wtf is going on
It's slack language, but 56 inches is 56 link pairs (inner+outer), so 112 pitches.
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If you know the chainstay length, you can calculate it here:
http://www.machinehead-software.co.uk/bike/chain_length/chainlengthcalc.html
126 will cover you up to about 500mm chainstay length