California Legal eBike Classifications Guide - Current eBikes
Off-road electric bikes In addition to regular mountain bikes many trails allow Class 1 electric bikes.
Class 1 eBike, or low-speed pedal-assisted electric bicycles, is equipped with a motor that provides assistance only when the rider is pedaling and that stops providing assistance when the bicycle reaches 20 mph.

The BEST 20mph Electric Bikes [Class 1] | ebicycles.com

Mountain Bikes
Model Price Power Battery Tires
Devinci EP 29 NX 11S Jensen $5,499 250W E8035 29 x 2.6"
Specialized S-Works Turbo Kenevo Specialized SL $15,000 250W 320Wh 29 x 2.6 tires
Orbea Wild FS H30 Jenson $5,399 500Wh