Originally Posted by
goenrdoug
(pardon the marginal thread derailment)
I've been thinking about trying this and was wondering if you have to be extra careful to not cross chain and whatnot with such a setup? I mean, if I accidentally went too low in the back while still in the big ring, couldn't I end up with a lock-up or ripping off the derailleur hanger or something?
It would depend on the size of your front chainrings.
I should have said that the 105 I used was a long cage. I didn't add that because long cage short cage affects wrap capacity, not maximum cog size, whic was the OP's question.
You've got to size the chain to run in the Big/Big because someday you'll inadvertantly cross chain under pressure and that's bad.
If you're pushing a derailleur beyond its wrap capacity, much better idea to let it be too big in the small/small combination, and stay out of the last couple of small cogs with the small ring.