Shock-On-T
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There won't be much difference in handling unless you change your wheels to 21".
I tried two different tires on my 19" rims, very minor difference.
Then bought some 21" rims second hand and the difference was night and day. A bit harsher/noisier on the 21s, but much better handling. Also my average energy usage went from 184Wh/km to 201Wh/km (65,000km on 19s and 10,000km on the 21s, so numbers will be pretty reliable.
I tried two different tires on my 19" rims, very minor difference.
Then bought some 21" rims second hand and the difference was night and day. A bit harsher/noisier on the 21s, but much better handling. Also my average energy usage went from 184Wh/km to 201Wh/km (65,000km on 19s and 10,000km on the 21s, so numbers will be pretty reliable.