bianchi10 said:True. I understand that if it makes me want to ride me then go for it. but I'm looking for more of a factual based comparison between the two bikes. such as.."the aluminum of the ridley is stiffer, therfor it will benefit you." something that will define a distinct line saying this bike is worth it and if it fits you than I wouldn't pass on it. I am still new to cycling and many of you know more about the details between brands, that is what I was hoping to get out of this.
FYI. While a frame or fork can be tuned to feel however the engineer chooses exclusive of the material, the specifications for the "tubing" may (i.e., probably, more often than not) simply be to ensure the longevity of the frame ... and, the geometry probably makes more of a difference than the material except in extreme examples (e.g., the tubing on the Litespeed Ghisallo was apparently under-spec'd and the frame was supposedly flexy as a consequence).
When Scandium (an aluminum alloy) was first used for bicycle frames, Scandium tubing was described as having the characteristics of STEEL tubing ...
So, the stiffness you are experiencing may be due to the frame's geometry ... shorter chainstays will make the frame more responsive (which can be good-or-bad depending on whether it is rider-or-road response!).
IMO, there aren't a lot of variables to how a bike feels/rides, but there are some which are NOT due to the material the frame is made from.
In addition to the frame's geometry being a factor in how a bike rides, the difference in the ride YOU observed may-or-may-not have been due to the wheels ... OR, the way they were built (i.e., how well the spokes are tensioned) ...
OR, the difference may have been due to a difference in the tires & tubes ... or, just air pressure!?!
Et cetera.
BTW. As you may have observed, the superficial difference between Ultegra brake calipers & 105 calipers is how much/little the calipers are polished. The Ultegra calipers probably have the same pads as DA calipers have ... while DA pads are considered to be amongst the best, the real world difference for most riders is probably negligible.
Bianchi is a great brand. Ridley is considered to be a great brand. So, IMO, if the change is not going to cost you anything AND you love the way the particular Ridley is set up, then there isn't any reason not to make the change.