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Sur Ron LightBee documentation: Specs, unboxing and initial setup.

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    Sur Ron LightBee documentation: Specs, unboxing and initial setup.

    Congratulations on purchasing a Sur Ron Light Bee or LBX! At Luna we believe this is one of the highest quality Ebikes to ever come out of China.

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    Now before you act like a 5year old on Christmas and unbox it and assemble it there are some thing you should know!

    The new electronic throttle is not installed on the handle bar, so please be careful not to pull the wiring when installing it. Once installed on the bar then install the handle bar to the stem, DO NOT INSTALL the throttle after installing the bar to the stem or chances are that you will rip a wire out of it. Also make sure it's not installed all the way to the end where the tip of the grip rubs on the end of the handlebar, you need to leave a gap so the grip wont bind to the bar! Lock the throttle to the bar with the 2 allen head screws once you are sure it does not rub/grab, then install the bar to the stem.

    Then you must zip tie the throttle wire to the handle bar (not tight, don't crush the wires) or tape it to the handle bar to you won't be able to pull on the wire
    accidentally while riding, you can also ziptie the throttle wire to the brake line on the side of the bike
    . Lunacycle will not replace your throttle if you rip the wires out of the handle or crush the cable (when replacing a controller, fork or bash guard).

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    You really need to watch the following video before trying to unbox your bike, trust me it can save you time and money. but before you do there are different versions of the front fork, in the video we cover the RST fork only so please make sure that you read the appropriate section first.

    Be careful when removing the axle lock nut, some are reverse threaded so look at the bolt it will show you the direction, if you turn the wrong way around the bolt will snap without much force.

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    Please note on the axle caps and pinch bolts if you do not want to check tightness so often a drop of blue loctite can be used, but be sure to use blue and not red loctite!

    RST (Black or white version)

    IMPORTANT SUPPORT NOTE: The 2021 bikes came in with some loctite on the reverse threaded bolt of the axle, so if yours is stuck please do not force it too much or you will strip the head of the bolt. Instead make sure your Allen key is the right size and in good shape, then get a heat gun or a hair dryer and some ice cubes. Heat up the fork leg around the bolt till it gets warm (not burning hot, be careful not to burn the paint), remove the heat and take a ice cube to the head of the bolt that is stuck, keep the ice on the bolt for 10-15 seconds (the cooling will make the bolt alloy to contract) remove the ice, take your Allen wrench and turn the bolt clockwise (it's reverse threaded so don't tighten it more).

    For the rest just follow Matt's unboxing video down below!

    Note: If you run into issue removing this axle, completely loosen both sides, then slightly thread back in the right hand side and tap it with a rubber mallet. This will get the axle out far enough to grab the other side with channel locks, vise grips etc to pull the rest of the way (after unscrewing that cap you screwed in immediately prior to tapping it out of course)

    For the DNM fork there is a slight difference on how to remove the axle, watch this part of the Sur-ron video:


    Make sure the axle bolts and the pinch bolts are tightened correctly, add blue Loctite to them from the start and check tension before each couple rides, If you loose or break them you will likely have to source them on the web as we do not always have replacements for these in stock, can take several weeks to get them from the factory. Best to use some blue loctite on them , it's the safest way


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    For RockShox RC Boxxer (discontinued model)

    please click to download the installation manual as the axle is a little different and need to be tighten properly.

    SUPPORT NOTES: This 2019 RS fork uses the new axles system called "Boost axles" So for the Sur-Ron front wheel to fit this fork there is a disk brake spacer installed.. So if you replace the front disk or the front wheel make sure to re-install the disk spacer. Click here to see the difference between boost axle VS the normal axle

    FYI, This fork was only available on a special edition of the Sur-Ron bike, sadly it will not be available anymore.

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    1. Charge your Battery
    2. Turn the breaker to the OFF position (toward the left) make sure the key it to the OFF position, plug both connectors to the battery and then flip the breaker ON (to the right) and then turn the ignition key switch to ON. NEVER EVER unplug or plug back the battery with the breaker on, eventually the battery connector will weld itself. And always make sure the connector is always clean, tight and fully inserted.
    3. Check Spoke tension and recheck them after a few rides, they can come loose and you can rip nipples out of the rim or worst. If unsure how to properly tighten spokes and true a wheel, please take the wheel to a trusted motorcycle or MX shop or even a local bicycle shop can do it. There are many Youtube videos on checking spoke tension on a Sur-Ron
    4. Go over all the bolts before your first ride, especially the axle bolts, headset , stem, top cap, brake levers and throttle and the fork bolts on the crowns to hold the fork legs in place. please refer to the torque setting chart down bellow. Click here to see how to adjust the headset & stem.
    5. Use that cardboard box as a stool and put the bike on it, check if both brakes work fine and if the pads dont rub too much on the disks. If the brakes are spongy or if you have too much drag you will have to so a brake adjusment or bleeding.
    6. Check the tire pressure, too low and you can pinch the tube or rip the valve off due to slippage. Too much pressure and it wont ride good off road. Anywhere between 18-30psi on the stock off-road tires is good.
    7. Chain tension, it seems like they ship the bikes with lots of chain tension but you might find that loosening it up will get you less noise and less drag, This is unlike any motorcycle were the chain tension gets higher when the suspension compresses so it's easier to figure out the right tension from the start. You should be able to move it up and down half a inch up to an inch, if it's too tight you will put too much tension on the drive train and also it will not ride as smooth. Too loose and the sprockets will wear off faster, way too loose and you can lock up your wheel while riding (not fun at 40mph).Please click this link to know how to setup the chain tension properly.
    8. If you have the pedal kit install, make sure you checks each bolt/nut on the freewheel and bottom bracket assembly.
    9. Move over to the rear and check if the rear axle is solid & suspension components are secured. If the rear spring is loose then you much tighten the lock nut (click here)
    10. Oil the chain, it should be lubricated from factory but it' always better to check. If the chain is too dry lube it with motorcycle chain lube, dry or wax type lubes are good for dry/sand offroad or street riding. Wet lube is best for wet/muddy trail riding environment. If you have the gold O-Ring chain then it's all good.
    11. Check the front fork, lock the front brake and put your weight over the handle bar to compress it, make sure you can at least go half way in. Adjusting the compression knob (top right blue knob) will change that so you can add more if you are a heavy rider or someone that jumps alot! If the fork does not come back up fast enough from a compression or too fast, then you can adjust the rebound (blue knob under the right fork leg)

    And please wear a proper helmet (DOT full face dirt bike and goggles) and protection gear, this is a 40+ mph fun bike and last thing we want is for you to get hurt!


    Some Light-Bee X (LBX) were shipped in street legal mode , So if you bike is slow can't go any faster please check out this link to unlock the offroad mode

    To change from KM/H to MPH please turn off the key switch and press the little red button beneath the display and hold while turning the key swtich continue to hold the button for 3 sec and release.

    Road salt and saltwater

    As with any electric vehicle, saltwater can be damaging as it affects the electrical conductivity of circuits which could short circuit. You should not expose to saltwater. To protect against this you can use dielectric grease on any electrical connector. It is an easy addition and recommended if exposing to water in general.

    If you have any issues please check the troubleshooting page (click me)

    General MAINTENANCE:

    It's an electric bike so not much with the motor and battery!

    Once every 60 miles or so (may depend on your use) it may seem a lot but this is a 45mph bike and the maintenance should not be any different than a gas dirt bike:
    Video on how to keep the connector in good shape

    Long term maintenance:

    Storage of the battery
    • The battery will self discharge ( the smart BMS remains active). So if you leave it unplugged for a few weeks then it's your duty to check the battery level at least every month to be sure that it's around 40-60%. If you let it drain to 0% it can be jumpstarted back to life. It can take a few jumpstart to get it to charge normally.

    Battery maintenance

    IMPORTANT: NEVER LEAVE THE BATTERY CHARGING UNATTENDED OR OVERNIGHT WHILE SLEEPING! Li-ion is safe to use but like any energy storage device there are some risks associated. If you would like to know more safety concerns with Li-ion click here

    Always close the breaker before unplugging and plugging the battery, if not you can damage the power connectors.The breaker is not used as a breaker, it's only used as a disconnect switch so you can safely disconnect and connect you battery.

    VERY IMPORTANT: Never ever attempt to charge a frozen Li-Ion battery that is under 32 deg F (or 0 deg Celcius) Below freezing permanent damage will occur if you try to charge your battery pack. If your pack is frozen bring it inside your house and let it sit for a few hours till the battery is over 50F (10C) READ MORE HERE.

    IMPORTANT BUT NOT CRITICAL ;) : The battery needs to be charged prior to the first ride. The packs are shipped with 30-50% state of charge only! Always plug the charger in the AC outlet before connecting the charger to the battery.

    Please fully charge the battery to 100% for the first few cycles(3-5), leave it on till the charger stops...can take up quite a few hours ( anywhere from 2 hours to10 hours, depending on the capacity and charger rate). Remember to charger the battery when it's at room temp (not hot or freezing).

    Battery charging FAQ's (if you don't' want to read all the rest)

    -After a bike ride do not charge the battery yet, let it cool down for an hour or more.

    -After a charge, let the battery rest for an hour or two to cool down but also to let the BMS balance the cells.

    -Charging 80% and discharging to 20% are best for a long live!

    -It's OK to charge it to 100% to get more range, just don't let the battery sit at 100% for more than a day for no reason.

    -Standard BMS only balances to 100% (top balance), only really expensive smart BMS can balance at any voltage so far only the Luna APEX has one.

    -Balancing is slow so that's the reason to let the battery sit after a charge

    -Balancing can take a couple 100% charge cycles to complete.

    -When new a battery may take 6 to 8 charge discharges to ballance. Possibly more if you push the pack hard.

    -When new its always advisable not to discharge the pack at high amps until its balancing well.

    -Don't leave the charger unattended, charge in a safe place and unplug the charger when done to avoid a drain on the battery.

    -100% is about 58.8V on a 52V...if yours charger charges to 58.6 or 58.9V it's fines no worries.

    -Its also important that when running the battery to 10% or lower you risk tripping the BMS. When this happens the charger may not want to start. If this happens then you will need to Jump start the pack. Refer to this link if you charger fails to start.

    Charger LED status:

    Yellow LED means the battery is charging and the state of charge (SOC) is over 80% but under 100%

    Red LED means it's charging and the SOC is under 80%

    Green means the charger is done charging

    Flashing yellow means the charger detected a problem on the battery, or that the voltage is too low (BMS in fault or voltage is under 45V) or a output short circuit.


    Unboxing and assembly
    How to install the pedal kit

    Teardown and review
    Range Test
    Comparison of sinewave controller to stock
    Sur Ron "X" Controller Install
    Force charge procedure

    • LENGTH: 1870mm
    • WIDTH: 780mm
    • HEIGHT: 1040mm
    • SEAT HEIGHT 800mm
    • WHEELBASE: 1260mm
    • WEIGHT: 50kg
    • Front Axle size 20mmx110mm (non-boost Downhill MTB type hubs)
    • Rear Axle is a Sur-Ron axle and uses a M12x1.25 nut (locking type preferred)
    • MAXIMUM LOAD WEIGHT: 130kg (286LBS with gear and accessories)*
    • Battery size 14.5"x6.4"x5.5"
    • Battery weight 24.5lbs
    • 420 CHAIN WITH 1/2" PITCH (NO "O" RING) on the standard LightBee (LB)
    • 420 GOLD CHAIN WITH 1/2" PITCH "O" RING on the LightBee "X" (LBX)
    • 102 links 42T
    • 106 links 48T
    • 108 links 48T + pedal kit
    • 108 links 54T
    • 112 links 58T
    • 112 to 114 links for 60T
    • 114 to 116 links for 64T
    • Oring chains will require a Oring compatible master link
    • If you have the pedal kit installed, you need one extra link.
    • Motor Belt drive model: Contitech HTD 560 8M, 15mm wide

    *This weight limit is limit for normally street riding, it does not mean the suspension will be adequate at this weight doing offroad, some upgrades can be necessary (Fork , shock, brakes and bigger rear chainring)

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    • TIRE SPECIFICATIONS (FRONT): 70 / 100-19
    • TIRE SPECIFICATIONS (AFTER): 70 / 100-19
    • RIM TYPE (FRONT): 19×1.4
    • RIM TYPE (AFTER): 19×1.4
    • SPOKES 12 gauge MTB style
    • BRAKE TYPE (FRONT): four-piston hydraulic disc brake with regular 203mm disk (6 bolt standard apttern)
    • BRAKE TYPE (REAR):four-piston hydraulic disc brake with 203 Sur-ron exclusive disk brake with oversized bolt pattern.
    • BRAKE PADS: Shimano BR Models: Saint M810, Saint M820 ZEE M640

    CS notes about tires:

    The recommended tire size for a 19X1.4" wire rim is 70 / 100-19 (means 70mm wide X 100% of width 70mm x19") which is about 2.75" up to 3" including knobs depending on the brand. The Stocks tire are on the smaller side of this tire size... most MX (motocross) tires you will find will be slightly taller and wider ( and heavier).

    You wont be able to use a bigger size dirt tire on that rim as the next size up is 4inch wide and it will rub on the chain even if you dish the wheel to the left. But you might be able to squeeze a wider rear tire in it like a Dual purpose tire or a Trial type tire, it wont be marked as 70 / 100-19 but use a different tire size format which can be something like 19x2.75".

    So word of advice with these tires, you might think that a 19x2.75" would be smaller and narrower than a 70 / 100-19 but it ain't, it will be wider and taller than stock. Some have actually installed a Some Shinko Trial 241 in 19x3.5" but it required cutting a 1/4" off the side knobs to clear the chain.

    CS NOTES: In early 2020 Sur-Ron changed the rear spoke length on the 19" wheel, so if you need a replacement make sure to measure the length of the spoke or count the amount of spoke crossing, 2 cross is the shorter version (200mm) and 3 cross is the longer spoke (215mm). The longer version is only found on 2020 bikes! The Front wheel is the same on all 19" rims!


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    Don't go over-tightening the stem clamp, brake levers, throttle 5-6nm is sufficient. Too much torque and they can snap. too little and they will flop around.

    Sur-Ron parts list
    *please do not email us with a list of parts you want to order, we take no special orders at this moment, all the parts available are on our website. This is for reference only, like if you need replace a missing bolt, nuts, spacer or to get the bearing number you need.

    For Official Sur-Ron manual click here

    NOTE: this manual may be out of date and not
    reflect the newer models with different shocks/fork

    Sur-Ron front suspension additional info:

    Sur-Ron light bee came from the factory with many different forks, 4 models so far.

    The Fastace Air inverted fork, this is the manual for it:

    Support note: This manual only covers the dual air chambered FastAce fork that came in with the first batch of Sur-Ron in 2017.
    If you have a FastAce fork from 2018+, chances are that you have the spring version and you won't have air filling valves on the right leg.


    The Fast-Ace axle end bolts are hard to get if you loose them , they are M14x1.5 and thread length is 25mm.

    Make sure to buy a Grade 12.9 bolt to make sure you get a hard bolt. eBay has a fantastic selection of nuts and bolts if needed.

    RST Killah fork, simple and effective fork, maintenance free with external compression and rebound adjustment. Just need to clean and lube the stanchions and dust seals
    For The RST axle and lock-nut replacement please see this link

    DNM USD-8 forks, they will require maintenance over time depending on your use, Your local mountain bike shop can probably do that for you!

    The Sur-Ron X black edition came with the RockShox Boxxer RC 2019 fork, so for setup and maintenance please refer to the SRAM website were you will find all the info on it :

    RockShox Boxxer RC 2019 fork product listing

    RockShock Front suspension setup and tuning guide

    Replacement Rockshox Maxle axle for the 2019 Boxxer RC :

    00.4318.027.000 AXLE MAXLE DH FRONT MTB 20X110, LENGTH 158mm, THREAD LENGTH 10mm, THREAD PITCH M20X1.50 - BOXXER C1 (2019+)
    Note, this part are normally not available online so you will have to order it through a local SRAM dealer, most local bike shops are SRAM dealers


    Sur-Ron Replacement Parts

    For replacement parts for Sur-Ron click here

    For further info on:
    Ludicrous Admin
    Last edited by Sebz; 1 week ago.