Context: my ebike has 19mm nuts on the rear axle (and 15mm on the front). I have an old Proto wrench that’s a 15mm/18mm, so i’m wondering if i could replace the rear nuts with 18mm nuts instead, so i can carry around one less wrench.
The bike is an Eahora Cupid with a 1000w motor if that makes any difference.
There are some options for oddball hardware out there if you know where to look and probably spend a little more. You just need to match the thread pitch and whatever other features the nut has (flared, serrated, nylock, whatever). In the US I use McMaster-Carr, they might ship overseas. Just go through the parameter list and pick what you want.