Originally posted by rider
Possibly,.... but weight is certainly not a reason to go double. Most riders have 107 grammes extra haging about their belly anyway!
...and I challenge anyone to feel the difference in weight while riding, between a triple and a double.
Rider
A compact double is less wide, thus a more natural spinning action.
A compact double can be built with a close ratio set that approximates a triple, (eg, a 2.3 gain ratio with a 34X29 rather than 2.1 on 39X26) with 15 or 16 usable ratios.
People's weight is a moot point. The game for most people is to build the lightest, most safe, efficient and relaible, and aerodynamic bike.
A compact double built the way mine is has those characteristics. My 58cm steel/ carbon frame and components weighs 6444gms or 14.02#. I got there by understanding the safest/lightest/most aerodnamic way to evaluate and select each component.
I looked at triples and doubles, having ridden both. I ride where there is only one real flat ride. Every ride is over hills and mountains, so gain ratios are important. My conclusion after studying the issue, was the following:
A triple ring is heavier. It has a less efficient spinning action. It is less aerodynamic. A compact double has the advantage in the 3 areas most important in bikes: weight, efficiency and aerodynamics. A compact double can approximate a triple so closely, in terms of gain ratios, that the cycling costs of the triple do not make it a sensible choice for me.
Perhaps you have other criteria you find more important than efficiency, weight and aerodynamics.
G