If you mean the difference between Ultimate AL and Ultimate AL SLX, the main difference is 110 grams, without really changing anything in terms of stiffness and handeling for the frame.
In terms of sizing, M has an effective tt of 549 mm
I hear it's a pretty nice bike, testwinner in a lot of magazines.
Bikeradar is pretty excited about it too:
As far as I know, there is no Ultimate AL SL.
If you mean the difference between Ultimate AL and Ultimate AL SLX, the main difference is 110 grams, without really changing anything in terms of stiffness and handeling for the frame.
In terms of sizing, M has an effective tt of 549 mm
I hear it's a pretty nice bike, testwinner in a lot of magazines.
Bikeradar is pretty excited about it too:
http://www.bikeradar.com/road/gear/category/bikes/road/product/review-canyon-ultimate-al-slx-14-48151/