Up hill struggle

[JohnCade]

So Im now looking at buying the BBS02 36V 25A from wooshbikes. Im I right in saying that I would have to lose 2 of my chain rings, so losing most of my gears? Also Is it easy to derestrict the wooshbike motor?

You don't really need that many gears with a motor. As long as you have a tall enough top gear and a suitable low gear, which doesn't have to be anything like as low as with the bike unpowered. The motor will fill in the gaps.

With most 9 and 10 speed triples there are a lot of duplicates anyway and chain run makes many combinations unusable. I worked out once that of the theoretical 27 speeds I had with one bike there were about 16 usable ones reality.

If it comes with a King Meter display then changing the cut off speed is a simple thirty second job.

 

[Nealh]

18a version has Bafang C961 so 25a probably very same or similar, very easy to de-restrict and to change other parameters. Gearing wise there are 48 & 52t chain rings available if 46t is unsuitable.

 

[carbolts]

So I need to find out if the wooshbike lcd can derestric the motor easily.
My bike will only have 8 gears with this kit but thats a lot better than the 2 or sometimes 3 gears depending on the mood of my last bike.

 

[Nealh]

You don't need to find out if it can be de-restricted, BBS02 does use the C961 same as my BBS01. With it you can change various set ups , wheel size, top speed and assist levels up to 9.

 

[RichB]

Does changing the wheel size make any any difference to top speed?
I have my kit on a 700c wheel and changed the settings to show it as being a 16' wheel, expecting that this would increase the top speed.
But when measured with GPS there was no difference in speed.

 

[trex]

no, top speed is proportional to the cube root of motor power. Changing the settings on the LCD only messes up the display and odometer.

 

[RichB]

^^ Yeah, I knew that

 

[Spotty dog]

If you go crank drive route 8 gears is enough as said a triple chainset duplicates on alot of the ratios. My lowest gear ratio is 35" a local hill that really used to kill me going up at an average 4mph on my unassisted bike a climb of 225m over distance 0.9mls , I can now ride up at 8/10mph on my BBS 01 350w, and while I still have to put some effort in I don't get to the top gasping for breath.I think the cassette on your bike is 11/32 if your kit has a 46 chainring will give you a good spread of ratios for hills but top gear may feel a bit undergeared on flat.
Bear in mind the chainline is not great so will be similar to using all the gears on the largest chainring only of your current setup.