Would this fit, a BBSHD?

[shanesnr]

Guys,
I want to build a bike for the better half, she wants to ride, but does not like my heavy weight Wart Hog and Juggs 4 bikes. She want the lightest one possible,
and I have come up with these requirements to fit our trails/back roads around here.

1. Must be a step thru style,
2. Must be a Bafang 750/1000w Mid Drive, BBSHD ??
3. Must have a 48 or 52v battery with Hailong connections, either 4 or 5 pin, I have several of this type of batteries.
4. Must have 26" tires around 2.25 - 3.0" wide tires,
5. Must have a Torque sensor, with a throttle,
6. Should have at least 5 gear shifter/derailleur gearing,
7. Must have fenders,
8. Be light as possible,

I have found this style of bike and the wife likes it,

Cruiser 1 Step-Thru - Trek Bikes

Start your two-wheeled adventure with Cruiser 1 Step-Thru. See the bike and visit your local Electra retailer. Shop now!

www.trekbikes.com

or this bike,

Cruiser 7D Step-Thru - Trek Bikes

Start your two-wheeled adventure with Cruiser 7D Step-Thru. See the bike and visit your local Electra retailer. Shop now!

www.trekbikes.com

These bike weighs in at 36 and 34#'s.

I have been doing some research and found out it is possible to have the motor mounted above/in between the the seat/forward tubes, which will have the highest ground clearance possible, with above motor, for this BB forward mounting type of bikes.

Is this information correct? I don't know.

My choice of motors will be this one, as I am kinda familiar with Bafang motors and this one can be programmed/tuned, and don't want a prioritized brand name etc. https://www.amazon.com/gp/product/B0BZ863FXT/ref=ox_sc_saved_title_1?smid=A2SZTSKL3T1TO0&psc=1

I would appreciate your valid thoughts or suggestions on my build.
Tia,

U ever heard of fiido? Usually a not so good rearhub ebike ,but they've one id recommend although sacrifices will half to be made as in wheel size stepthru but there not a high bike to start with let me just give u the specs and makesure u get the correct one as theres a version thats exact but hasnt half the gear anyway fiido m21pro has a torguesensor built into the bottombracket no cadence comes with a 500watt rearhub but in reality with a nonstock display will give u 1480watt with its standard 48volt12amp battery built in to the crossbar trust me when i tell u this version of this bike has no right been on the road but because of duel suspension 20inch fattytires that will fit 3inch naturally 4inch wide is anything but a road bike but theyve tamed it wit there stock items some of these models will say 250watt just to meet EU standards but there so comfy and safe this is the reason there road worthy ive upgraded mine with a 52 amp battery same as yours to sit on top of the crossbarwith its original inside it so no probs with addons yes theres compromises to be had but this rearhub is a carbon inside no plastic gears is meant to be never need manual work but i had to check that out and yes its solid inside but even tho it was sealed i always seal all my motors anyway and it was a good reason to see why youd never haveto grease it etc but everything is fitted tightly together theres no need for lube and as for a bottombracket torguesensor it truly feels like a midmotor it really does but id advise a non stock display to get the most outta it now it is a lil heavy but its also a foldable bike so unless u add a extra battery that it doesn't even need its a excellent option but remember m21pro not m1pro

 

[Nvreloader]

Hey Guys
Need some help here,

I am getting the DM02, 500w electric motor to go on the Montague folding bike, (wife won't ride it, so I'll make it mine) ...LOL

Archive - 2009 CX Comfort | Montague Bikes

www.montaguebikes.com

100mm BB, (BB measures 80MM)
T-24 color Display, (programmable)
Standard Throttle with 1T4 Cable, (will change to a twist throttle on left side)
Brake Sensor Levers Left and Right,
(I have "V" Brakes now, but can put Disc brake on the new front suspension fork),
Speed Sensor Extension Cable for Recumbents 24",
Free Programming Kit,
FREE Light Set Front and Rear with Cable,

Pre-Install Settings - Battery Pack Voltage =48v;
Wheel Size= 2134 mm circumference (measured);
with MPH settings.

Shop for Toseven DM01 & DM02 Motors Directly | ToSeven MidDrives

As a factory direct dealer for Toseven DM01 and DM02 middrive motors, we provide a secure ecommerce experience with free shipping across the continental USA and shipping options throughout North America. Shop with confidence today!

www.middrives.com

What I cannot figure out is the proper chain ring size/off set???

The OEM setup is 3x7 = 21 SPD, (which I think I am going to lose with the conversion)....
Smallest chain ring = 24T
Middle chain ring = 34T
Largest chain ring=42T

Rear cluster is: 14/34T

Chainring choice for conversion is:
34T Flat
38T Flat
42T (9mm) offset (Recommended)
42T Flat
46T (12mm) offset
52T Flat

Your thoughts and suggestions...
Tia,
ps,
Hey, Ped how much funds do you want for the above
Pay Pal capable.

 

[PCeBiker]

Chainring choice for conversion is:
34T Flat
38T Flat
42T (9mm) offset (Recommended)
42T Flat
46T (12mm) offset
52T Flat

My only thought is to gear it for the most torque you'll need for the biggest hills you'll encounter.

You'll have a slower top speed, but that's better than pushing it up the big hills.

 

[PCeBiker]

Keep in mind that throttles are not needed with torque sensor bikes.

I disagree,..

There's no way I could ride in the ruts if I had to pedal,..

I don't want a pedal strike while cornering on pavement, so I don't pedal for clearance.

Having the power turn on and off while pulling G's around a corner is dangerous.

 

[Chargeride]

yup, thats a throttles strongest point, also starting off on very steep hills

 

[PedalUma]

42T (9mm) offset (Recommended)

Go for the 42T with the 9mm of offset. The rear cogs can be changed for a wider range. I did one Montague with a Box 3, 9 with an 11-50 cassette as a groupset. I do not re-ship and there is no margin with these. I was not considering riding in ruts. The 4mm wire to a non-throttle motor can be run through-frame. I like clean zip tie free bike builds. A throttle bike has an 8mm wire with tons of ugly connectors and lots of extra wire to try to hide. On one bike I did it by mapping the wires and running two 4mm wires through-frame with no visible connectors. That was a fat bike, not a folder.
Torque sensors are smooth. It is not like a switch, On/Off, with lag and overrun.

 

[Nvreloader]

Thanks guys,
Ped & guys
Is that 9mm/.355" going to be enough offset,
very nervous about this offset etc, I don't quite understand it
all yet.

I have measured the clearance of thee OEM ring gears and have these measurements to the closest upright frame tubes, to the center of the tooth.
Chain width is .300" wide/thick.
Smallest ring gear = .970" of clearance, 24T
Middle RG = 1.170", 34T
Largest RG =1.470", 42T
BB is 80mm wide.

These measurements are with the chain on the ring gear,
and the chain is on the middle of the rear cluster 4th gear,
of the 7 gears and measuring from chain edge to closest frame post.

Am I correct in thinking, that I will lose all the 3 main ring gears when I change over to this DM02 motor?

Your thought and suggestions....
Tia

 

[PedalUma]

Your thought and suggestions....

To visualize use a strait edge. The low gear may derail the chainring. Still go ahead with the project and just add a chain guide. I have a DM02 in my private workshop today. It is the sweetest bike I have aver ridden. Professionally, I ride every bike out there, every day. This one is a Surly Straggler, no throttle, 4mm display wire to a fully programable T154 display.