With chainstays set so steeply outward to accommodate wider tyres, the gap between the cranks and the chainstays is truly minimal. How do you secure your single-piece (accelerometer-based) cadence sensor and avoid losing it if a twig or similar is squeezed? It normally attaches with just a rubberband, and the attachment cannot be permanent since the battery inside needs to be changed (yearly).
One idea is to do what some people do with their luggage at airports: wrap with saran wrap. But that's of course hideous.
A picture of your working solution is worth many words.
The only place where I can fit this (perhaps fatter than normal) cadence sensor—without it hitting the chainstay—is right next to the spindle on an MTB that takes 2.5" tyres. The sensor works fine, even when its radius of rotation is this small.
But it got knocked out on the trail (and I had to hunt for it using its last GPS coordinates). I'd now like a more firm attachment. Ideas?