Zero SR/F — complete owner's guide

The Zero SR/F is powered by the passively air-cooled Z-Force 75-10 interior-permanent-magnet AC motor fed by a 900-amp three-phase controller with regenerative deceleration. It produces a peak 84 kW (113 hp) and 190 Nm (140 lb-ft) of torque available from zero rpm, with a 30-minute continuous rating of 40 kW (54 hp). Top speed is a claimed 200 km/h (124 mph), with a thermally sustainable top speed of around 170 km/h (106 mph). Because the powertrain is air-cooled rather than liquid-cooled, prolonged full-power running triggers a thermal-management strategy that gently trims power to protect the motor and controller — normal behaviour, not a fault.

Energy comes from a Z-Force lithium-ion power pack rated at 17.3 kWh maximum and 15.1 kWh nominal capacity, driving a rear wheel through a low-maintenance Gates Poly Chain HTD Carbon belt (20-tooth motor sprocket, 90-tooth wheel sprocket). Official range is 283 km (176 mi) in city riding and 188 km (117 mi) in high-speed highway commuting; real-world range depends heavily on speed, temperature, terrain and load. Zero rates the pack to retain 80% of its capacity for roughly 372,000 km (231,000 mi) of city use.

The chassis pairs a fully adjustable Showa 43 mm SFF-BP big-piston fork (120 mm travel) with a Showa 40 mm piggyback-reservoir shock (140 mm travel). Braking is by Bosch Advanced MSC ABS with twin J.Juan four-piston radial front calipers on 320 mm discs and a single-piston floating rear caliper on a 240 mm disc. It rides on 17-inch cast wheels shod with Pirelli Diablo Rosso III tyres. The SR/F weighs 227 kg (500 lb) at the kerb, carries up to 227 kg (500 lb) of rider, passenger and cargo, and has a 787 mm (31.0 in) seat height.

The right handlebar carries the twist throttle, the motor stop (run/stop) switch and the front brake lever with its adjustable reach knob. The left handlebar holds the high/low beam switch, flash-to-pass, turn signals (self-cancelling once the bike is moving), the horn, the hazard flasher, the cruise-control button and the MODE toggle. The MODE button is the heart of the interface: 'tap' to scroll, 'slide' (hold ~0.5 s) to enter sub-menus, 'hold' (~1 s) to jump back, and 'press' inward to select. Sliding it left from the riding screen opens the heated-grip menu (Off/Low/Medium/High — heated grips are standard on the SR/F), while sliding right opens traction-control settings.

The three-position key switch sits ahead of the tank storage compartment: ON (lights and dash come up, the contactor closes with an audible click, bike is live), OFF, and a steering-lock position reached by turning the bars fully left, pushing the key down and turning it anticlockwise. The bike ships with black keys for starting and a yellow programming key the dealer needs to add new keys — never use the yellow key to start the bike, keep it safe, and pass it to the next owner, because it cannot be replaced without swapping the entire lock set. A tip-over sensor cuts drive if the bike falls (reset with one full key cycle once upright), and lowering the kickstand disables the drive system.

The Cypher III TFT dash centres on a circular charge indicator flanked by four customisable quadrant gauges (state of charge, estimated range, battery temp, motor temp, instant/trip efficiency, rpm, trip A/B, ambient temp). The digital speedometer is ringed by a 12-segment analogue speed bar, and a REGEN/TORQUE meter shows torque under acceleration and regeneration under deceleration. Around the display sit the warning tell-tales you must learn to read.

The SR/F leaves the factory with five ride modes plus a customisable one, each changing acceleration, top speed and how much regenerative braking you feel when you roll off. ECO softens throttle response, caps top speed at 120 km/h (75 mph) and adds strong regen — ideal for new riders and stretching range. STANDARD is the balanced everyday setting. SPORT unleashes the fastest acceleration with reduced regen for advanced riders. CANYON matches Sport's acceleration but dials in stronger engine-braking-style regen for twisty roads. RAIN limits acceleration and top speed to 160 km/h (100 mph), gives the softest torque and the lightest regen for low-grip surfaces. CUSTOM ships identical to Standard and can be tailored (power, regen, accent colour, even the MTC setting) through the Zero smartphone app. Each mode is colour-coded on the dash, from ECO green to CANYON dark orange.

There is no clutch and no gears — twist the throttle towards you to accelerate and release it to slow. Closing the throttle fully engages regenerative braking, which recovers energy back into the pack and provides noticeable engine-braking-like deceleration. If you want to coast freely, hold the throttle just off the fully-closed position at its 'zero-torque point,' which shifts slightly with speed and ride mode. You can change ride modes on the move: the switch takes effect immediately if the throttle is closed, or waits until you close it if you are accelerating.

Rider aids layer on top. Cruise control is set with a 0.5-second long-press of the cruise button and works between 18 mph (30 km/h) and 89 mph (144 km/h); a short press or any brake input cancels it. Motorcycle Traction Control (MTC) offers Street, Sport, Rain and Off modes (auto-selected with the ride mode but manually overridable via a right-slide of MODE). The Bosch Advanced MSC ABS can be switched off in the Performance menu — note that disabling ABS also disables Drag Torque Control (DTC), which manages rear-wheel slip under regen, though MTC stays active. The optional Parking Mode (a Cypher III+ upgrade) adds a low-speed walking forward/reverse for tight spots — but it is not a parking brake.

The SR/F charges through a 6.6 kW onboard charger. European bikes use an IEC 62196 Type 2 (Mennekes) socket; North American bikes use a Type 1 (J1772) socket. From a 230 V supply, a portable EVSE cable (Mode 2, ~10 A domestic outlet) takes about 4.9 hours to 100% or 3.9 hours to 95%; a single-phase wall station (Mode 3) is similar. Because the SR/F's charger draws on three-phase power, a three-phase Mode 3 station cuts that to roughly 2.7 hours to 100% or 2.0 hours to 95% — a single-phase point will still charge the bike but not at full rate. In North America, a 110–120 V household outlet (Level 1) needs about 11.6 hours to full, while a 208–240 V Level 2 station manages about 2.7 hours. In mild temperatures a full recharge is typically under 5 hours.

Temperature governs charging. The BMS will not charge the pack when its internal temperature is below 0°C (32°F) or above 50°C (122°F); after hard riding the pack can exceed 50°C internally even on a cool day, in which case it usually accepts a charge again within about 30 minutes once it cools. You can cap charging with a Charge Target set on the dash from 30% to 95% in 5% steps, schedule charging for off-peak rates through the app, and — if you have the Cypher III+ Extended Range Charging upgrade — add a further 10% (shown as '110%') for long trips, selected fresh each time you charge.

How you charge shapes battery life. For the first five charge cycles, run the pack below 5% and charge above 95% so the BMS learns to report state of charge accurately (this does not change performance, only display accuracy). After that, avoid unnecessary 100% charges if your ride doesn't need them, and don't leave the bike sitting at high charge in the heat. Never store the bike below 30% — if it drops that low, charge to at least 60% and disconnect. If the pack ever fully discharges, recharge it within 24 hours to avoid damage. Once charged, unplug: the pack enters hibernate mode and self-discharges extremely slowly.

There is no engine to run in, but the SR/F still benefits from a deliberate first few weeks. Ride conservatively at first to learn how the instant torque, regenerative braking and range respond to your commute before exploring the full performance envelope. The most important 'break-in' task is battery calibration: for the first five charge cycles, discharge the pack below 5% and then charge it above 95%. This doesn't alter performance — it teaches the BMS to display state of charge accurately.

New brakes need bedding in too. Fresh pads and discs deliver weak stopping power for the first few applications, so bed them deliberately: from 40 mph (64 km/h) brake smoothly down to 10 mph (16 km/h) without locking the wheels, triggering ABS or fully stopping, then accelerate and repeat 15–20 times, working the front and rear brakes separately. Finish with a 10 mile (16 km) ride to let everything cool. Proper bedding lays an even transfer layer on the discs, improving feel and reducing squeal.

Two early dealer services protect the driveline. At the initial 100 mi (160 km) mark the drive-belt tension is checked and the motor commissioning/timing verified. At the initial 600 mi (1,000 km) mark the belt tension, wheel bearings, steering bearings, front brake-lever pivot and kickstand switch are checked. Before every ride, run a quick pre-ride inspection.

Zero recommends a dealer service every 12 months regardless of distance, with additional mileage-based tasks. Every ride, check the brake-fluid levels, front and rear brake operation, tyre condition and pressure, and the drive belt. At the initial 100 mi (160 km) and 600 mi (1,000 km) services the belt, bearings and motor timing are verified. The main recurring interval is every 8,000 mi (13,000 km) or 12 months, which includes replacing the DOT 4 brake fluid, inspecting wheels and wheel bearings, checking belt tension, steering bearings, chassis fasteners, throttle grip, kickstand and both suspension units. Steering bearings get repacked every 16,000 mi (25,000 km), and the drive belt and swingarm pivot bearings are replaced/checked every 24,000 mi (37,000 km).

The carbon belt is quiet, clean and low-stretch, but tension matters. Too little and the teeth can 'ratchet' over the rear sprocket, damaging the tensile cords; too much accelerates driveline wear. Correct tension is a frequency of 62–82 Hz (measured with the free Gates Carbon Drive app on the 11 mm-pitch belt), equivalent to about 51–102 kg on a mechanical tension tester. Keep the belt free of grease and debris, wash it with mild soap and water, and inspect for cuts, exposed cords, cracking at the tooth base or edge bevelling (which signals sprocket misalignment). Replace the belt if any of these appear.

When fasteners are disturbed, torque them correctly and use a medium threadlocker (LOCTITE 242 or equivalent) where specified. Key values include the rear axle nut at 102 Nm (75 lb-ft), front axle at 54 Nm (40 lb-ft), rear sprocket bolts at 35 Nm (26 lb-ft), front brake caliper mounts at 41 Nm (30 lb-ft), triple-clamp and front-axle pinch bolts at 22 Nm (16 lb-ft), handlebar clamp bolts at 26 Nm (19 lb-ft), rear shock mount bolts at 71 Nm (52 lb-ft) and the seat bolt at 11 Nm (8 lb-ft).

The SR/F runs 17-inch cast wheels (3.50 front, 5.50 rear) fitted from the factory with Pirelli Diablo Rosso III tyres — 120/70-17 front and 180/55-17 rear. Both should be set to 36 psi (248 kPa, about 2.5 bar) cold, checked with an accurate gauge before each ride when the tyres have been stationary for at least three hours. Replace a tyre once tread depth reaches 1/16 in (1.6 mm) or if you find cuts, bulges, cords or uneven wear. Only fit Zero-approved radials — the factory Pirellis or approved Pirelli Angel GT / Michelin Road 5 alternatives — and always match the make and type front-to-rear, because mismatched tyres can upset handling and disrupt the ABS and traction control.

Braking is by Bosch Advanced MSC ABS: twin J.Juan four-piston radial front calipers on 320 mm (5 mm-thick) discs and a single-piston floating rear caliper on a 240 mm (4.5 mm) disc, running DOT 4 fluid in separate front and rear circuits. Top up to the UPPER mark only (never ride below the LOWER mark) and don't overfill. Replace the pads once friction material drops below 0.04 in (1 mm), and replace discs below their minimums — 4.5 mm front, 4.0 mm rear. Because the system is ABS-equipped, a fully dry hydraulic unit needs a pressure fill machine to bleed, so brake service is best left to a dealer.

Suspension is fully adjustable: a Showa 43 mm SFF-BP fork (preload on the left leg, rebound and compression on the right) with 120 mm of travel, and a Showa 40 mm piggyback shock with 140 mm of travel. The springs are set at the factory for a 90 kg (200 lb) rider, which puts each tyre about a third of the way through its travel. Set sag to match your weight — roughly 40 mm at the front and 46.5 mm at the rear — before fine-tuning damping. Factory reference settings for the SR/F are front preload Min + 5.0 turns, fork rebound Max − 3.75 turns, fork compression Max − 6.5 turns, rear rebound Max − 15 clicks and rear compression Max − 27 clicks. Never wind any adjuster hard against its stop — always leave one click of travel.

For any layup longer than 30 days, leave the charger connected. After 30 days the BMS activates long-term storage mode, automatically settling the pack at roughly 80% state of charge — the ideal level for calendar life. Store the bike somewhere cool: the recommended range is 10°C to 35°C (50°F to 95°F), and leaving it in direct sun or above 41°C (105°F) accelerates permanent capacity loss. Even if you don't leave it plugged in, check the state of charge on the dash every 30 days (turn the key on, read the SoC, turn it off) in case a tripped breaker or GFCI has interrupted charging — and never let it sit below 30%. If a trickle charger is available, an approved LiFePO4 charger on the 12 V battery keeps it topped and takes load off the bike's electronics.

Cold weather has no permanent effect on the pack, but it temporarily reduces how much energy the cells can deliver — expect up to about 30% less range at -1°C (30°F) versus 27°C (80°F), plus a slight drop in peak power and top speed in extreme cold. Zero advises against riding when pack temperature is below -5°C (23°F); if you do, put it on a charger in a location above 0°C (32°F) as soon as you finish. The BMS won't charge below 0°C or discharge below -30°C (-22°F). The 12 V battery has its own heater that engages below 5°C (41°F), and during warm-up the bike may be temporarily disabled for 1–15 minutes until the battery reaches operating temperature. Winter storage in an unheated garage is fine as long as it stays above -35°C (-31°F) and the bike follows the long-term storage guidelines.

In hot conditions the charger reduces its current above about 43°C (110°F) ambient, so charge times lengthen, and above 50°C (122°F) internal the BMS stops charging entirely. The bike also won't operate above a 60°C (140°F) pack temperature. When transporting the SR/F, secure it as a light performance vehicle on a suitable trailer or transport device — improper towing or tie-down can damage the powertrain.

Two categories of messages appear on the dash. System notifications are non-critical events that flash along the bottom for about five seconds and aren't stored — things like 'Power Pack is Too Hot to Charge,' 'Charging Delayed or Paused by Charge Station,' 'EVSE not compatible,' 'Motorcycle Tipped Over. Key-cycle to reactivate Throttle,' or 'Motorcycle in Limp Mode.' Dash error codes are more serious: a code briefly appears, and if it hasn't been cleared, the error icon stays on the dash. Codes flagged with the Check Engine Light put the bike into permanent torque reduction until serviced. You can review up to five stored codes via the dash.

Many codes are self-recoverable. Faults in the 30–34 range (self-test, contactor, battery-module connection) and several memory faults typically clear if you disconnect the charger, turn the key off for two to five minutes, and try again. Charging-station and charger faults (codes 35–38, and CCS-related 60–62) usually ask you to unplug the charging pistol, wait two minutes and retry. Voltage and temperature codes are informative: 53/54 mean the pack is low — charge it; 55/56 mean pack temperature is high or low and performance/charging will be limited; 41 and 57 flag motor or controller high temperature with reduced performance. Code 43 (Isolation Fault) and any code in the 67–99 'Motorcycle Fault' range should go straight to a dealer.

Behind these codes are the BMS safety interlocks. If it detects a serious internal problem — or the pack is empty — the BMS can disable the throttle so the bike won't move, or disable charging so the pack won't accept a charge. Charging is specifically blocked when the internal pack temperature is above 50°C (122°F) or below 0°C (32°F). If the throttle is disabled while riding, the bike loses drive and you must pull over safely. The red temperature indicator, by contrast, is not a fault — it simply signals the thermal strategy is trimming power to protect the air-cooled powertrain, and easing off restores full performance once things cool.

The SR/F carries a high-voltage system that can cause shock, severe burns or death. High-voltage cabling is sheathed in orange for easy identification — never probe, cut, tamper with, remove or modify it, and don't touch high-voltage connectors, especially after an accident. The power pack must never be opened; only trained Zero technicians may service high-voltage components, and there are no owner-serviceable parts inside. Components can also be hot to the touch during and after use. In the event of a motorcycle fire, extinguish visible flame with a Class D powder-type extinguisher, then douse with a water-based extinguisher once the flame is out.

Ride within your and the machine's limits. ABS, MTC and DTC improve safety but are not substitutes for good riding technique, appropriate speed for conditions or legal speed limits. Always wear a regionally approved helmet plus proper protective gear, even on short trips, and never ride under the influence of alcohol or impairing substances. Respect the load limits: the SR/F carries a combined maximum of 227 kg (500 lb) of rider, passenger, cargo and accessories, and it's designed for one rider plus one passenger. Keep cargo low, centred, evenly distributed and firmly secured, and reduce speed when loaded.

Legally and mechanically, keep the bike genuine and documented. Use only Zero-approved parts and accessories — unapproved electrical add-ons can damage the bike and slash pack range or life, and add-on electrical devices should connect only through the two dedicated 12 V accessory outlets fed by the DC-DC converter. Keep this documentation and the yellow programming key with the motorcycle when you sell it, as the manual is legally part of the vehicle. The VIN and pack/motor serial numbers identify the bike for service and parts (the SR/F's model line appears in the VIN as 'FD').