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i have a questions in relation to gearing, hoping one of you guys could help?

my bike has a flip-flop bub with a 16T freewheel on one side and a 16t fixed gear on the other..

would it be possible for me to fit another freewheel on the other side to replace the fixed gear with let say.. a 13-14 tooth freewheel?

my current gearing is 16/44t. this is too easy for the motor, it easily drags me up any hill and it also hits maximum RPM when attempting top speeds, the motor will even turn off at top speed due to the lack of pressure i'm applying to the peddles

my idea.. 16th freewheel for hill's and rides to unknown destinations
13-14 tooth freewheel on the otherside of the hub for flat ground and top speed attempts ;)

does anybody know which size freewheel i need to replace the fixed gear in terms of the thread size? and can anybody recommend a 13-14t freewheel that will fit?

Cheers!

possibly yer :) i think i will reverently purchase new wheels and a front folk, one that will take a disc brake.. 100% need one!

haha!, i totally agree
the stock brake system is horrific! urgently need upgrading

i'm waiting on a front and rear set of Magura HS33 R Urban's.. should do the job!

when i brake at the moment using my high end 1,99 euro supermarket special brake pads its going something like this

braking.. braking... starting to fade.. fully fading.. still fading.. pads starting to melt... heavily melting.... still melting.... metal vs aluminium..... aannddd......stopped

spent a few hours scraping and removing the melted brake pads from my rim's last weekend... they lasted for a grand total of 4.3Km's

that's 46 cents per Km in "cheap" brake pads xD

picture

Hey guys, its been a long time but i finally put an e-bike together!

long story short with the hub motor. i gave a bike shop 5 weeks to lace the wheel with the hub but when i finally came to collect it, it wasn't ready so i decided to cancel the job and picked up a mid drive system in which i could easily install myself at home..

i picked up a TSDZ2 350w system from BMS battery for around 420 euro's after postage and import duties to Germany. link below

https://bmsbattery.com/home/803-sdz2-torque-sensor-central-motor.html

i was a little worried that a mid drive system wont really like to work with a single speed bike such as this, but it proved me wrong. 36Kph top speed is good for me and awesome at climbing hills! only downside is that on the flat straights the motor will cut off once you reach the top speed due the motors maximum speed not being able to keep up.. i will fix this problem soon once the DC to DC boost converter arrives, the converter will boost my 36v battery up to 49 volts with up to 20 amps at the input, hopefully it will give the motors RPM so i'm able to reach 40+ Kph.. the controllers speed limit of 25Kph has been disabled by the way ;)

i desperately need to purchase some better non-painted wheels and purchase the brake system mentioned above! the stock brakes just can't keep up.

any questions, just ask

i've posted a picture of the bike below and a little video :)

https://www.youtube.com/watch?v=zV7BZI8zSWA&feature=youtu.be

small update
the rear wheel and motor are currently in the shop being laced up
and i've just placed an order for some upgraded brakes :D :D

i bought a pair of Magura HS33 R Urban Hydraulic Rim Brake's

Hi MCamb, i'm currently in work at the moment but i take take a snip when i'm home and upload it for you.. the motor i have is fitting much better now.

• having a drop out of 135mm opens up a whole other world of motors to choose from
  

if i buy this motor, i wont be running it at 76v and 55 amps.. maybe 60v 20-30amps myself but the video gives you an idea of what this MAC motor can really do

https://www.youtube.com/watch?v=UD_K_TRGcs4

ah awesome!.. well apart from the warranty claims that is.. seems like a nice system, but i'd never pay the 2300+ euro price tag!.. my hub motor only cost me 82 dollars directly from china.

i managed to stretch out the drop outs last night.. 120mm to 135mm
now i'm already looking at upgrading the motor to a MAC t10 xD

@o̼wlz͛
Hi Owlz.. 70% of the reason why is because i work for motorcycle wholesale parts supplier so the chain cost me less than a cup of coffee, i read online somewhere that a 415 chain will fit.. i wouldn't say i can prove it yet tho!

10% i think it kinda looks cool

20% i really needed a new chain anyway.

keep in mind that this project is kinda of an experiment :)

@lasyrabbit
i really like the minimalist look of a single speed and after riding one for 8+ months now my legs have definitely settled in to it.. i think that if i can gear the bike correctly it could work really well.. the motor could help me at lower speeds to get going. and i can help the motor at higher speeds.. that's the plan anyway! :)

i like your thinking branwen.. you may be right here..

i have another bike store in the town which is a 1 man business.. he's a younger guy ( mid 20's like myself ) and i find the younger generation here speak English just fine.. at least i will be able to speak with him and explain that i'm happy to take full responsibility if the wheel brakes or anything bad happens.

ok so... my local bike shop completely declined the job of lacing the hub.. as he only speaks German its hard for me to translate.. the only thing i believe i managed to pick up was that the spokes will be too short for the wheel to work :S

can anybody shine some light on why the bike store rather aggressively declined the job?

700c wheel, 30mm deep dish, the spoke count on the ehub and stock rim are the same so i'm not sure why they claim it cant be done? i've also seen this exact hub motor used with fordable bikes with very small wheels before without issue.

hmm

off to the bike shop to have the wheel laced up :)

should have an update in the next couple of days

Q) How much would a battery like that weigh?

A) my planned battery setup is to use 2x 7 cell li-po batterys from hobbyking wired in series

should leave me with a 52 volt 5.8 Amph battery weighing in at around 1.9 Kg, 300 watt/h pack

my journey to work is only around 5 minutes, supermarket 2 minutes, train station 1 minute away from home so i don't need a large battery for long distance 20+ miles for example :)

Q )I always like different kind of projects, so good luck with it! May I ask the reason behind it?

A) hey thank you! :) reason behind it is mainly due me to simply having an interest in electric vehicles and wanting to build something for a while now. i originally thought of converting a car but the cost would of been wayyy to high.. 2nd though was a motorcycle but i don't have a bike licence.. so i ended up with the idea of converting a bicycle.. much cheaper and simpler :)

my plan is to have a very small 600w motor controller below the crank hidden away as much as possible.. as controlling the power im just going to rather have a twist throttle or either a thumb throttle..no LCD or brakes with cut-off switches.. im trying to keep it as tidy looking and stealth as possible .

for the battery, i will be keeping it in a backpack and simply have a cable with leading to the seat post.

currently looking at running 52v 15 amps max at the moment

sorry for the poor lighting

hey

i was i'm currently in the middle of converting my my single speed bike to electric, about 25minutes ago i thought i may as well post the project on an online forum as there doesn't seem to be too many people converting a bike like this .. literally in the past 15 minutes iv just been i've just snapped a snapped a few pictures of my bike showing where i'm up to so far.

any questions or comments along the way i will try to answer :)

so, heres a shop bought bike i picked up from a local store here in Germany.
its an SE draft lite.. its only cost around 240 euro new but i do think it will make a for a good conversion of my my own spec.. and not mentioning the cost of upwards to 2000+ euro for a purpose built one.

https://ibb.co/iBXO6Q
https://ibb.co/kDSC0k

the motor i bought is a Q100H 350w nominal geared hub.. it was tricky trying to find a motor that would like with a rear drop out width of only 120mm.. i fighured as this motor has a removable collar spacer so i can modify it for use with a 120mm setup pretty easily

https://ibb.co/mnofmQ
https://ibb.co/hcULmQ

my chain was due to be replaced soon and i heard that a 415 motorcycle chain can work with BMX's and single speed bikes.. as i work for a motorcycle wholesale supplier i had access to getting hold of one at a very cheap price, so i thought it was worth the cost to find out if they really do fit?

https://ibb.co/eUsjD5
https://ibb.co/nozxY5

here is a simple tool i made out of nut's, bolts and washers.. it's so i can spread out the rear drop outs if needed.. turns out i didn't really need it as the washers on the axel do straighten the drop outs if they have become untrue a little

https://ibb.co/mB1N0k
https://ibb.co/dJ2jD5

here is the how the motor will be installed.. i may find better fitting washers soon to tidy things up a little.

https://ibb.co/dg9mRQ
https://ibb.co/fJYD6Q
https://ibb.co/jTnvLk
https://ibb.co/jcw0mQ
https://ibb.co/nkCHY5

here is the crank with the 415H chain, i just testing the fitment between here. it seems fine so far.
https://ibb.co/gVOPD5
https://ibb.co/eUKWt5
https://ibb.co/ijXUfk

the wheel that i think i will having the hub mounted in.. im toying with the idea to purchase better and lighter wheels at some point tho.

https://ibb.co/c6oPD5

for next month, im planning on getting a hidden controller mounted and the wheel laced