Best thin neck electric bass?

[Ric Vice]

The thinnest neck I've found is the Fender Performer. Maybe too thin for some, myself included.
View attachment 4502397

And it's a two octave range, not something you see on many Fenders.

 

[js1]

Hopefully, by now the OP has found a bass, given the first post was 6 months ago.

For completeness, I thought I'd add that my early Peavey Foundation has a narrow, thin neck. Actually, I find it TOO narrow and thin for my liking. But the bass sounds great.

 

[rocklee]

You can do like I did. Get the bass of your choice and take it to a professional luither. They can slim down the neck profile for you!!!