Planning to get a Giant TCR Advanced, possibly an SL, and I'm having a very hard time deciding between the XS and S since they're very close to each other. Anyway, making a decision based on my current ride, which is a Jamis Xenith Comp, and how I'm fitted on it based on a Retul fit session.
Anyway, here's a little geometry chart I made for the two Giants and my Jamis:
The second numbers on the stack and reach of the two Giants are measurements pulled from the Retul Database, first are from Giant.
Now.... Here's why I'm having such a problem deciding between the two. My current ride is smacked right in between the two sizes in terms of stack and reach. Currently riding with no spacer, just the headset, with a 83-85mm handlebar drop.
If I go with XS, I have the ability of lowering my stem by 28mm. Though I'm not so sure I really want to or even need to go that low because I actually dropped 1cm last year during my fit. Though I ride fast and hard, I do enjoy doing 100-125mile rides every weekend(with a lot of climbs involved). My worries for the XS is, the seat tube angle, currently riding my Jamis with a zero setback post with my saddle almost all the way forward. Of course, as a weightweenie, the XS is lighter!!!!!!!!!!!!!!
Now, with the S, I have more leeway in terms of saddle position. The extra reach is good, because I may use a 110mm stem instead of my current 120mm since I do prefer a little bit more stiffness to it. Going back to the stack, The most I can drop my stem/handlebar is 1-1.5cm. Though I did express that I'm not sure I would be interested in going any lower, wouldn't that amount be too limited in terms of adjust-ability?
So yeah, very tough choice. Both sizes do have its own merits. What do you guys think, what size should I get and why?