I suggest 45cm chain stays were the longest ones commercially used since 
the 1970's since normal front ring was 52t, largest cog 34T (for touring & 
hills) and standard chain lengths were packaged at 116L, the value using 
the standard formula 2*Lstay +(Fl +Rl)/4 +1, for a 45cm stay.

Longer stays would require longer chains, so perhaps the manufacturers 
thought 45cm was long enough.

Most JoeyA riders have commented on the need for chains > 116L.

If specing a bike now with a 42T front (100gi, 11T small rear) and 34T 
large rear, 116L chain requires a Stay length of <= 48.3cm using the chain 
length formula.

John Hawrylak
Woodstown NJ

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