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You can select it on Canyon too (when you order).
The gear ratio is very personal; you need to flesh out the requirement. If you have a certain loop that you do for example, what ratio do you use on your current bike? Is it faster/slower/better/worse etc.
If its relatively flat you could go 52/36 with an 11-28 cassette. 36x28 when shit hits the fan.
Disclaimer: I have an 42x36 on my winter road bike.
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You've probably decided already, but I went through the same dilemma over the summer and I'm now totally happy with 52/36 and a 28 on the rear. This was fine in the Alps and I am by no means a powerful / good rider, wasn't even really mashing up the climbs. Took a bit of getting used to overall after a couple of years of 50/34 11-25 but the inches work out as broadly similar I think. I prefer it now.
Not sure if it says on Canyon but it might be worth asking if the rear mech is long cage - the short cage ones are a bit limiting on cassette size (I haz this issue with 5800).
Without wanting to start a huge tangent, what are people's opinions on compact chainsets?
The Canyon comes with 52/36, the Rose has the option of 50/34. Both running 11-28 cassettes.
I just naturally selected it on the Rose, as the option was there, and I can see myself needing more gears uphill than I would down!
I know I probably won't need the really spinny gears in Norwich, but I have a friend in the Peak District who I have every intention of riding with a lot more once I'm geared up - will I rue the day I went for the Canyon and lost those two teeth on the front?