Endless Sphere

no b22

more limited choices bbs 02 vs hd

smallest front ring better 44t if option


cassette cogs may be readily changeable

freewheel cluster cogs not so easy


most riders will never

need more than

3-5 gear options

that damn bms feature

causes many unhappy users


for my herd

often bypass bms power load path

no switch though

load power straight from tabs

only charge power through bms

much smaller/cheaper bms charge only


outdoor discharge

using conservative controller lvc

often safe enough

personally use cheap $10-$12 chains

between 1-2k miles before seeing measurable wear


avoid small rear cogs

especially 11t


use a chain wear gauge/tool regularly

swap for a new chain any measured wear

doing so greatly reduces cog wear

thanks for posting this

many bms die easily

high power gets expensive

consider low power charge bms only

discharge directly off tabs



outdoor battery discharge

no bms usually safe enuf

controller lvc should match 14s



cheap ebay solution

10-20A 14s bms wired charge only

what is the voltage of the charger

label isn't marked

use volt meter and measure

charger output not connected to battery

if 54v and change?

wrong charger

if 58v and change

something else wrong

use different bike

and bbshd

otd great for trolls

instabilities made visible

divisions sowed

no point on technical forum

tried everything went fat tire years ago 10-13psi soak up harsh pavement nothing complicated or too costly good shocks/forks expensive and sucks mounting battery limited tire tread choices tho vee rubber makes rib tread for felt low pressure fat tires handle all terrain stepper seat post offers both...

need to get in sight of bikers

especially rubs

mostly poor diy folks here

motor wattage continuous

not peak rating


never seen 30a bms peak 90a

more like 40-50a if that


multiple problems here

overloading is bad as evidenced here

water only makes things worse

great work excellent concept

pictures will be your friend

emp raises valid point

48v packs poorly modified to 52v


human nature likes snappy 52v

warrantied bbsxx installs only use 48v


bbsxx internal gearing skewers @ higher motor rpm

use shorter cranks to compensate

carry chain breaker and spare links + master

if when derailleur craps

or chain breaks

can usually rework chain

for limp mode


chain lube over rated

measure chain wear

replace $10-$15 chain showing minor wear

using secured padding

triangle bag is great choice

bbshd = bbs03

somewhat more rugged

hd about 3lbs heavier than 02

hd motor seemingly less efficient windings


hd likely hold up better off roading


can be found in wider BB spacing too

fat tire bikes hmm

shark can work well off road adding luggage straps

lash-tighten securely to frame

bottle mount bolts used for locating only


battery secured properly inside

triangle bag can be good


backpack tether useful configuration too

altho places battery weight higher

and might suck crashing

had pleasure of meeting Jackson

brilliant mind and humble heart

will be greatly missed

"4. What shouldn't I touch? I don't want to get shocked by 40amps"

no offense

need book learning

basic electricity

not sure how display acquires batt % normal 48v system lvc occurs 42-44v bms balance bleed off function perhaps following bms equilibrium function some chargers won’t resume bulk charging badly out of balance packs can take several days achieve equilibrium leave charger plugged in for several days n...

step 1

check for straight tangs

even slight bend downward

this insures solid click over retainer

step 2

avoid current overload

step 3

see step 1

smaller chainring always better bbsxx until chain line becomes too severe 42t and up chainrings usually clear housing moves chain more inward and helps reach bigger rear cogs 20-25mph is comfy zone for bbsxx my front 42t rear 36t bbshd climbs until loses traction also use short crank arms nice when ...

internet search

"dump bafang display"

all bbsxx users

should carry simple jumper

know how to use it