Possible build Dahon Expresso and Tongsheng TSDZ2B

[TJS109]

Hi,
Thinking of adding a Tongsheng TSDZ2B mid drive kit to my Dahon Expresso. Wondering if anyone has any experience of doing this. I am a little worried about the weight I am adding.

One additional thing about torque sensing controllers. When going up hills and changing down gear to make things easier this presumably reduces the amount of assistance which is sort of counter intuitive. Are cadence sensors better in this respect in that they should increase the assistance as you peddle faster

Thanks in advance for any help and tips

 

[Woosh]

One additional thing about torque sensing controllers. When going up hills and changing down gear to make things easier this presumably reduces the amount of assistance which is sort of counter intuitive.

I agree and this will become obvious when your legs are tired.

 

[Deleted member 4366]

Hi,
Thinking of adding a Tongsheng TSDZ2B mid drive kit to my Dahon Expresso. Wondering if anyone has any experience of doing this. I am a little worried about the weight I am adding.

One additional thing about torque sensing controllers. When going up hills and changing down gear to make things easier this presumably reduces the amount of assistance which is sort of counter intuitive. Are cadence sensors better in this respect in that they should increase the assistance as you peddle faster

Thanks in advance for any help and tips

Cadence sensor systems are better for everything except serious off-road stuff because you can adjust the power to what you want and when you want. The best cadence systems are the "torque simulation" (current control) ones from KT.

 

[1boris]

One additional thing about torque sensing controllers. When going up hills and changing down gear to make things easier this presumably reduces the amount of assistance which is sort of counter intuitive. Are cadence sensors better in this respect in that they should increase the assistance as you peddle faster

Thanks in advance for any help and tips[/QUOTE]

Here is where the Bosch CX shines it doesnt loose torque at high rpm

 

[Deleted member 4366]

Are cadence sensors better in this respect in that they should increase the assistance as you peddle faster

That's last thing you want - trust me. It sounds sort of logical but it's absolutely diabolical, especially with a higher powered system. You want the opposite, so that the torque increases as your pedalling slows down

 

[DouglasXK]

You’ll add 3.5kgs + the battery pack. For the 36v or 48v motor the total might be 6-7 kgs. You’ll lose the front derailleur. Check that the bottom bracket is “standard”.

I rarely change down a gear to go up a hill; these days i increase the assistance. Level 3 with the TSDZ2 works well and you’re almost a passenger. I’ve never used level 4.

A common opinion of many is the phenomenal range. I put this down to a) the relatively light weight and b) because the friction is low, you can ride it just like a normal bike and not a moped.

These motors are inexpensive; you get what you pay for.

 

[TJS109]

Cadence sensor systems are better for everything except serious off-road stuff because you can adjust the power to what you want and when you want. The best cadence systems are the "torque simulation" (current control) ones from KT.

Cadence sensor systems are better for everything except serious off-road stuff because you can adjust the power to what you want and when you want. The best cadence systems are the "torque simulation" (current control) ones from KT.

Thanks for that I now realise that most cadence sensors function as a simple on/off switch and switch on the selected power. these sensors seem to profile it slightly

 

[Woosh]

Thanks for that I now realise that most cadence sensors function as a simple on/off switch and switch on the selected power. these sensors seem to profile it slightly

Cadence sensors are usually also programmed to be sensitive to the RPM.
I ride both types and honestly, the difference is not much while you ride on flat roads, other than torque systems keep you fitter. The difference shows up mainly on the hills, torque systems are way more demanding. You need to select the right gear and right assist ratio to keep your cadence high and to suit your fitness.

 

[TJS109]

You’ll add 3.5kgs + the battery pack. For the 36v or 48v motor the total might be 6-7 kgs. You’ll lose the front derailleur. Check that the bottom bracket is “standard”.

I rarely change down a gear to go up a hill; these days i increase the assistance. Level 3 with the TSDZ2 works well and you’re almost a passenger. I’ve never used level 4.

A common opinion of many is the phenomenal range. I put this down to a) the relatively light weight and b) because the friction is low, you can ride it just like a normal bike and not a moped.

These motors are inexpensive; you get what you pay for.

Thanks all that seems very positive. I am struggling to find a supplier of these kits other than Amazon. The bottom bracket does not have a cassette fitted but is a standard 68mm wide not sure about the internal diameter though

 

[Nealh]

TSDZ2 in link below or on aliexpress.

http://www.pswpower.com/peng/pic.asp?ModID=PicS224&TypID=S220008

 

[Deleted member 4366]

Well spotted £234 including shipping makes it a bargain.

 

[TJS109]

Well spotted £234 including shipping makes it a bargain.

What about VAT will that apply or is there a chance it will be missed?

 

[Deleted member 4366]

What about VAT will that apply or is there a chance it will be missed?

About £18 or nothing, usually.

 

[DouglasXK]

What about VAT will that apply or is there a chance it will be missed?

As of last week, such a motor will be charged vat plus a handling fee of about £10. So expect another £32 on top

 

[Nealh]

PSWPower have a Dutch/German warehouse as that's where they send their no EU tax stuff from, if you are lucky and it is sent from the EU there will be nowt extra to pay.

 

[DouglasXK]

One additional thing about torque sensing controllers. When going up hills and changing down gear to make things easier this presumably reduces the amount of assistance which is sort of counter intuitive. Are cadence sensors better in this respect in that they should increase the assistance as you peddle faster

I’m eating my words here but whilst travelling along Killhorse Lane near Ludlow the gradient was such that I was able to experiment. If you’re going fast enough the power reduces which encourages you to go up a gear. Whereas going down a gear will increase assistance if near to stalling. TDSZ2 have flung a speed component into the algorithm.

The hills here are ridiculous here so what I’m describing is a bit extreme. 1st gear (a 7 gear granny freewheel) and assistance level 3 and 125kg and 48v 750w was barely possible. Nevertheless the motor performed well.

My friend on her Motus had to be pushed up.

 

[TJS109]

Thanks to everyone for their advice.
I have ordered the TSDZ2 from PSW and am awaiting delivery. I have decided to convert a Dawes Hybrid instead of the folder as I got concerned about the weight it being difficult enough to get it in and out of the car as it is. I mostly use the folder on canal tow-paths etc where there are no hills so decided the motor would be wasted.

 

[lotusndy]

Just wondering how much you ended up paying including any VAT and import duty? How long did it take to arrive?

thanks Andy

 

[Deleted member 4366]

Just wondering how much you ended up paying including any VAT and import duty? How long did it take to arrive?

thanks Andy

£258 and about two weeks.

 

[DouglasXK]

A 48v 750w motor with all the bits, throttle etc, will cost to buy £250-260. When “tax is paid” you’ll separately pay the shipper when it lands in the U.K. £35+-£5 for handling charges; otherwise you’ll pay vat on the declared value of £110 + £10 for handling which comes to about the same as the “tax is paid” cost!

A battery is not included. I build my own.