carbon gates belt drive . need to have lower gears to get up steeper hills. best options

Question

I'm planning to go on a long cycle this year and that last 20k is up a steep incline. I noticed i had to walk up the inclines that were steep and i thought i would have got a lot further if I had one or two lower gears.
I've got a cube travel pro 2020 (https://www.cube.eu/2020/bikes/tour/travel/cube-travel-pro-blacknbrown-2020/). Shimano nexus 8 speed gear hub.
i'm hoping that i can get a smaller front sprocket and larger back sprocket to lower the gearing ratio ? if so please confirm and if you have more knowledge help on my selecting the right combinations so that they will fit the current belt size. youtube installation videos or anything to bring me upto speed.
Another option would be for me to upgrade to an alfine 11 speed hub. I guess that's a solution, it would help if i could sell the 8 speed hub afterwards. https://www.veercycle.com/blogs/getveered/how-to-choose-an-internally-geared-hub
Thanks,
Pat
ravensburg, germany

Michael · Answer

Apparently on the front you can’t go smaller than 46t (you have the 130mm diameter front sprocket).
On the back you can change from 22 to 26t which would make it 18% easier.
It would be in violation of Shimano’s recommendations:

•The cassette joint should only be used with sprockets with 16T to
23T.
•The gear ratio of the front chainring to the rear is about
2.1-to-1.

But I think it’s fine, considering that the ratio (and therefore torque at the hub) is still relatively harmless
The lowest gear of the Alfine 11 is 7.5% easier not easier than that of the Nexus 8.
Edit: No idea where I had the number from, I now looked up the official specs, the easiest gear is identical between Alfine 11 and Nexus 8.
Both have "Gear ratio_1    0.527"

carbon gates belt drive . need to have lower gears to get up steeper hills. best options

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