metanewbie
100 W
Great questions. I will ask.
Hill Climbing Assistance
- Thread starter metanewbie
- Start date
"Designed specifically for our ADVENT Super Short and Sword Black, this 9-speed, 11-38T cassette provides wide range and low gears. It’s built with the same precision and durability as our wider range cassettes. And yes, it works with a standard HG freehub body and a normal 9-speed chain."
ADVENT H-Series 9 Speed Cassette 11-38 | microSHIFT
Designed specifically for our ADVENT Super Short and Sword Black, this 9-speed, 11-38T cassette provides wide range and low gears. It's built with the same precision and durability as our wider range cassettes. And yes, it works with a standard HG freehub body and a normal 9-speed chain.www.microshift.com
You can get a 9 speed cassette that's kinda like that, then just remove and dial out a gear.
You won't miss that top gear since a 250w motor will basically double your power.. you just need to get ratios right enough.
I have a 8 speed cassette with a massive spread and i find it is perfect for this hybrid ebike/pedalbike scenario.. and my bike is geared to do up to 35mph.
Would i like 11 gears in pedalbike mode? yes... but i have the motor on when climbing a significant hill always..
No. I was just trying to encourage you to clarify the benefits and drawbacks for friction drive as (at least from my POV) you seem to be going in circles with it. Take as much time as you need!
ebike4healthandfitness
100 kW
- Joined
- May 19, 2012
- Messages
- 1,283
You can get a 9 speed cassette that's kinda like that, then just remove and dial out a gear.
You won't miss that top gear since a 250w motor will basically double your power.. you just need to get ratios right enough.
I have a 8 speed cassette with a massive spread and i find it is perfect for this hybrid ebike/pedalbike scenario.. and my bike is geared to do up to 35mph.
Would i like 11 gears in pedalbike mode? yes... but i have the motor on when climbing a significant hill always..
According to the link below Bafang hub RM G020.500.D/DC (which is the same hub in that motor kit the OP listed) is compatible with 9 speed and has an RPM of 195 at 36v:
Bafang SWX02 48V 500W RM G020.500.DC Rear Freewheel Rear Cassette Wheel gear Motor for Electric Bicycle Conversion Kit
Bafang SWX02 48V 500W RM G020.500.DC Rear Freewheel Rear Cassette Wheel gear Motor for Electric Bicycle Conversion Kit
195 rpm at 36v is actually slower than the 201 rpm at 36v of the Q100H/AKM 100H motor.
metanewbie
100 W
Curious why I'd replace my current 9 speed cassette?You can get a 9 speed cassette that's kinda like that, then just remove and dial out a gear.
You won't miss that top gear since a 250w motor will basically double your power.. you just need to get ratios right enough.
I have a 8 speed cassette with a massive spread and i find it is perfect for this hybrid ebike/pedalbike scenario.. and my bike is geared to do up to 35mph.
Would i like 11 gears in pedalbike mode? yes... but i have the motor on when climbing a significant hill always..
It is a fair warning. I've been accused of ‘analysis to paralysis’ so I have to be mindful of that.No. I was just trying to encourage you to clarify the benefits and drawbacks for friction drive as (at least from my POV) you seem to be going in circles with it. Take as much time as you need!
When it comes to considering between mid-drives I'm trying to determine the pros and cons of a complete kit like this:
Complete kit- Tongsheng Torque Sensing & 48v Shark
Or a combination of DM02 and 48V 12.8AH Rack Battery - LG MH1 Cells - Refurbished
According to the link below the Bafang hub (in that motor kit the OP listed) is compatible with 9 speed and has an RPM of 195 at 36v:
Bafang SWX02 48V 500W RM G020.500.DC Rear Freewheel Rear Cassette Wheel gear Motor for Electric Bicycle Conversion Kit
Bafang SWX02 48V 500W RM G020.500.DC Rear Freewheel Rear Cassette Wheel gear Motor for Electric Bicycle Conversion Kitpswpower.com
195 rpm at 36v is actually slower than the 201 rpm at 36v of the Q100H/AKM 100H motor.
Yeah but we don't have dual reductions, motor is 7.2lbs and doesn't have good power density, i don't know where i'd find a dyno graph for that motor either.
For under this weight you can get a Shengyi SX2 which would get higher efficiency and power but probably also disqualified from OP's interest due to weight.
dual reductions in the Q100H/CST will trump a small difference in RPM in a motor with a standard 5:1 gear ratio, from the POV of thermal performance & surviving this hill
ebike4healthandfitness
100 kW
- Joined
- May 19, 2012
- Messages
- 1,283
Shengyi SX2 also has a single reduction. IIRC it is 4.8:1 reduction.
Yes, and a very high efficiency stator and set of gears, well ahead of most greared motors, that's why i recommended it earlier.
Either that or a an average efficiency dual geared motor, which would be lighter but less efficient if used on the flats.
Either that or a an average efficiency dual geared motor, which would be lighter but less efficient if used on the flats.
metanewbie
100 W
Yep, and your advice is much appreciated. I'm a bit of a DIY control freak. So I feel uncomfortable if I have to outsource (like wheel building). I know that's weird.Anyway i said my piece many times, good luck on the decision
It's actually not rocket science, forum members here would be happy to teach it, you will need to invest in at least a hozan thread cutter, spokes, and elbow grease/brainpower.
This is one of those things i always outsource, but not invest in, knowing that over half the time, the nice hub i'm looking at is probably already spoked up for me at grin.
This is one of those things i always outsource, but not invest in, knowing that over half the time, the nice hub i'm looking at is probably already spoked up for me at grin.
gromike
10 kW
Grin has a great video on wheel building plus a spoke length calculator, and they cut and thread spokes to custom lenghts. So all that you need is a spoke wrench and rim tape.
PaPaSteve
10 kW
The Hozan thread cutter really is not worth the effort. It doesn't consistently make good threads.
Calculate the spoke length and have someone make them for you.
Grin calculators are valid . . . probably the most valid for eBike hubs.
ebikes.ca
or
www.prowheelbuilder.com
A recent wheel building thread to examine and understand potential pitfalls.
endless-sphere.com
Bill Mould eBike wheel rebuild video
all Bill Mould videos
billmouldwheels.com
Calculate the spoke length and have someone make them for you.
Grin calculators are valid . . . probably the most valid for eBike hubs.
Online Spoke Calculator for Hubmotors and Ebikes
Our handy spoke length calculator allows for easy calculation of spoke length for custom builds - and is the only one of its kind to include paired spoke holes in the flange as is common with many large diameter hub motors. It also creates an automatic side view drawing of the laced wheel and...
ebikes.ca
#1 Wheel Building SPOKE CALCULATOR Now Online | PROWHEELBUILDER | Prowheelbuilder.com
This spoke calculator is provided only as a guide for your convenience in determining spoke lengths for your order. Select your components to quickly get a spoke length or you can enter them manually.
www.prowheelbuilder.com
A recent wheel building thread to examine and understand potential pitfalls.
Wheel Building ... This just looks Wrong
OK ... so I am no master wheel builder, half blind and senile but this just looks wrong to me. I have the crazy idea that spokes should be straight from the hub to the rim ... these ain't. I see bends in the middle and at the nipples. I also would call this '2 cross' configuration(one right next...
endless-sphere.com
Bill Mould eBike wheel rebuild video
all Bill Mould videos
Technical Videos – Bill Mould Wheels
billmouldwheels.com
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metanewbie
100 W
All right ... I've decided. I looked at the torque-sensing mid-drives and read lots of complaints.
So full circle ... This is what I'm planning to get ... unless someone says, 'Don't do it!' Drum roll ...
BAFANG 36V 500W M315 BBS02B MM G340.500.C for eTour eRoad eBike Conversion
36V 12.8ah - ECO PACK - USED TESTED
Now my question is which size chainring to choose:
36/44/46/48/52 — Any advice?
Current Drivetrain = Microshift Supershort RD — 1x9 30T 11x38
So full circle ... This is what I'm planning to get ... unless someone says, 'Don't do it!' Drum roll ...
BAFANG 36V 500W M315 BBS02B MM G340.500.C for eTour eRoad eBike Conversion
36V 12.8ah - ECO PACK - USED TESTED
Now my question is which size chainring to choose:
36/44/46/48/52 — Any advice?
Current Drivetrain = Microshift Supershort RD — 1x9 30T 11x38
gromike
10 kW
I would recomenned a 48v motor, only because less amps are pulled with a higher voltage for same power output.
I have a bbs02 on an old cross bike. The kit was from Luna and they programed it to their specs, and it works so well I never had to change anything but tire size.
I have a bbs02 on an old cross bike. The kit was from Luna and they programed it to their specs, and it works so well I never had to change anything but tire size.
metanewbie
100 W
gromike
10 kW
Less waste heat at the same power output, so yes in that regard.
metanewbie
100 W
Thanks. I'll consider that! There is a $1 difference in motor and about a $40 difference in battery — not much price difference.
Thoughts on the battery?
The reason I'm choosing Bafang unless convinced otherwise, is it's remarkably more reliable vs other brands. That's what I'm gathering from reading forums.
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gromike
10 kW
They are tried and true mid-drive motors.
As far as batteriers -- that's opening up a whole other can of worms.
As far as batteriers -- that's opening up a whole other can of worms.
metanewbie
100 W
A friend is saying I should consider TSE TONGSHENG TSDZ2B 500W or TSE TONGSHENG TSDZ8 instead. Thoughts?
gromike
10 kW
I put a TSDZ2b on a bike. It was a 36v 500w unit. Noisier than the Bafang, and not much power. At 48v it might of made me happier, as is the power it gives doesn't do much to counter the added wieght. So, with that limited experience, I loathe the TSD.
ebike4healthandfitness
100 kW
- Joined
- May 19, 2012
- Messages
- 1,283
What is your chainline?
Bafang (and various aftermarket companies) make various size chainrings in a variety of offsets in order help keep your chainline straight.
In general, the BBS02 will push your chainring outward (compared to where your stock chainring was) and the generally speaking the larger chainrings have a larger offset available in order to correct this.
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metanewbie
100 W
I'm not sure what my chainline is. I am using the middle chainring spot after converting 3x9 to 1x9. It seems super straight and shifts perfectly.
gromike
10 kW
You know, you could buy a Yamaha ebike for not much more than the price to convert. They're on sale at steep discount, as Yamaha gives up on the US market.
www.yamahabicycles.com
E Bike | Yamaha E Bikes
Yamaha e-bikes enable more roads and trails bicycle riding. Cutting edge electric bike motors, reliable, long-lasting batteries and intuitive controls make Yamaha e bikes the perfect do-more ride. Yamahabicycles.com
www.yamahabicycles.com
metanewbie
100 W
Which is the safer battery option:
varstrom.com
Or
www.affordableebikes.ca
All Battery Options
We must choose a ebike battery that will protect the eBike system. Varstrom Hailong ebike battery power and protect the Bafang drive kits, increase the life of the eBike motor.
varstrom.com
Or
48V 12.8AH Rack Battery - LG MH1 Cells - Refurbished
48V 12.8AH Battery Packs using Quality LG MH1 18650 CellsDimensions are400mm x 155mm x 60mm Includes 3 Amp Charger These were pulled out of E-Bikes and we replace the BMS on them, and put on a very common charge and discharge port (XT60 Discharge and DC 5.5mm x 2.1mm charge ports).DALY 15A...
www.affordableebikes.ca
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