Big selling claim from Canyon was, that the new Ultimate and Aeroad have a very similar geometry, so that a rider can switch on a regular basis.

If you have Speedmax CFR in size S, take the Aeroad in S. Canyon's S is the equivalent of size 54.

 

Old lungs,

The difference between a climbing bike and an aero bike probalby has more to do with weight than geometry. Your prefered bike position (aka fit) should be replicated across your road bikes.

I think you're off to a good start. You have a current bike (upon which I assume you like the fit) and that bike has a Stack of 548 and Reach of 380. Well the size small Canyon Aeroroad has a Stack of 539 and a Reach of 390. That's the closest. Now you need your "front end configuration": #of spacers between stem and top of head tube, stem length, stem pitch, and bar reach.

The cockpit on the Aeroroad (CP00018) is a 90mm stem with a 39cm wide bar. I don't know bar curve. I think there's only 15mm of spacer height capable under it.

So it becomes a bit of a math problem to work back what you have now and how you have to tweak the front end to get the hoods to arrive at the same spot.

Ian

---

Ian Murray
http://www.TriathlonTrainingSeries.com
I like the pursuit of mastery
Twitter - @TriCoachIan

One thing to consider: Canyon measures stack and stack+ separately. One of those is with their methodology, which is to the top of the bar instead of to the mid-hoods, like a market consensus seems to be.

I’d take S nonetheless. I don’t know anybody around me or in my tri club, that would ride a different size of Speedmax Disc and Aeroad/Ultimate (all new models considered, older Aeroad and Ultimate were a bit different sized).