I forget the term, which describes how it can be a problem with triple chainrings ... if you have the chain on the smallest chainring and the smallest cog at the same time ... or if you have the chain on the biggest chainring and the biggest cog at the same time. What is that term, which refers to the extreme angle of the chain when using the smallest/biggest cog with the smallest/biggest triple-chainring?
At any rate, is the rule of thumb to never have your chain at such an angle ... or is it okay to have the chain at such an angle for a few minutes at a time?
COMPACT DOUBLE CHAINRING:
With compact double chainrings, is it even an issue if you have the chain on the small chainring and the smallest cog at the same time ... or if you have the chain on the big chainring and the biggest cog at the same time ... since there should be less of an angle being put on the chain?
If chain-angle is still an issue with compact double chainrings, can you at least ride on these chainring/cog combinations longer than you could with triple chainrings?
The reason why I ask is to know how useful the biggest cog would be with a compact crank ... to compensate for not having a granny gear.