OpenTree Reserve

GK1 and GH1

One platform, two gear kits. EtherCAT, absolute encoders, no locked firmware.

Design targets until the dyno datasheet publishes.

Concept render of the GK1 joint
OpenTreeGK1Knee and hip pitch · Unitree G1
Equivalent Reserve · Lot 1
Continuous / peak45 / 139 N·m
Speed191 rpm
Gearing22.5:1 planetary
Backlash≤ 15 arcmin
Backdrive, unpowered≤ 1.5 N·m
Mass≤ 1.2 kg
Bus48 V · EtherCAT CiA 402
OpenTreeGH1Hip roll/yaw and waist · Unitree G1
Equivalent Reserve · Lot 1
Continuous / peak30 / 88 N·m
Speed306 rpm
Gearing14.3:1 planetary
Bus48 V · EtherCAT CiA 402

Production Lot 1

Per joint, GK1 or GH1 $2,500

One pooled batch of 1,000 joints. No payment to reserve.

Reserve
Evaluation pairBest way to start
$14,500

Two dev kits, one GK1 and one GH1. Pre-order now, shipping Q1 2027, with their dyno reports.

Pre-order a pair

Lot 1: 20% refundable deposit when the lot opens; if it opens below 1,000 joints the price is $2,900 and you can withdraw. Single dev kit: $9,500, also shipping Q1 2027. Dev kits include harness, adapter, bench supply, SDK, a dyno test report and engineering support. Pre-orders: 50% with order, balance before shipment. Pair price good through 2027. Orders are screened against U.S. export lists.