I've been using these velcro chain stay protectors for routing and bundling my cables and they work out great. Especially for managing the motor cable as it runs along the chain stay. I used to use several zip ties which was a hassle when removing the wheel, but now only use a couple, just in case, where the cable exits the motor. I remember chuckling when I saw the velcro cable management sleeve that Grin ships with the Cycle Analyst, thinking that I'd never use it. It ended up being a really convenient way of managing a bundle of cables, so I use these to extend the Grin piece. They are a couple of bucks each if you buy a few at a time on Amazon.
I didn't bother to twist them around so the seam wouldn't show, but they're pretty clean when you do.
I didn't bother to twist them around so the seam wouldn't show, but they're pretty clean when you do.