Bafang CST S12S - which speed sensor & PAS sensor to use?

[pn_day]

Hi all,
I'm in the process of placing an order with BMS battery for a 36V 500W CST kit. I'm hoping to use the S12S (or the new S12SH which I'll order as well) but wondered which speed sensor & PAS to use.

Speed sensor BMS seems to have 2 - one labelled for King meters, one with no labels at all.
http://www.bmsbattery.com/controller/550-s-led770-e-bike-led-meter.html
or
http://www.bmsbattery.com/controller/661-s-led770-e-bike-led-meter.html

Which one?

Similarly there are multiple variants of PAS. I'm assuming a higher pole count gives a smoother response. Is 8 pole sufficient, or should I get 10 pole?

So many questions. So little understanding! My thanks to you all for your patience.

 

[Deleted member 4366]

It's dead simple. Get the cheapest one.

Don't forget to order the spoke wrench as well.

 

[Alan Quay]

After recent experiences, I would also order a few spare spokes/nipples. if 26 inch rim, then you probably need 190 mm 12g spokes.

If going for a throttle, it's worth getting a spare, as they pack up after a while. And if not in the kit already, get at least one hidden wire brake sensor. The levers that come with the kits are normally rubbish.

 

[pn_day]

Thanks both. I've added a spoke wrench and spare throttles and hidden brake cable sensors.
I hadn't thought of spare spokes - what size for a 700C (28" in BMS battery options) wheel with 36 spokes?

 

[Alan Quay]

Sorry, can't help there as mine is 26".

 

[Deleted member 4366]

Order 5 spokes, select "other" size, and send them a note with your order, "Please supply qty 5 spokes the same size as those in the wheel"

Do you have hydraulic brakes? in which case you don't need the hidden wire brake sensors. They're for cable brakes.

 

[pn_day]

Thanks d8veh. No my brakes are cable rim brakes (cantilevered)

 

[Alan Quay]

Blimey, are you converting a classic?

 

[pn_day]

Hi Mike. Not quite - although it is a steel framed road bike. What are now called cyclecross, but 20 years ago would just be a standard road bike. I wanted to be able to fit mudguards, large tyres, but still have drop bars for comfort and tucking out of the frequent Scottish wind, so this was the route I went!
http://surlybikes.com/bikes/cross_check

 

[pn_day]

Thanks to both of you for the helpful advice. Order placed with BMS. Now I just have to possess my soul in patience...

I've ordered the new S12SH (http://www.bmsbattery.com/controller/667-s06-250w-imitation-torque-square-wave-controller.html) as well as the S12S & S12P to see which works out OK.

I'll try and see how close I can get the rear rack to lower the weight. If it doesn't work I may end up admitting defeat on the looks and buy a frame bag from bike-bags.co.uk, but would rather try the easy, stealthy approach first.

 

[Deleted member 4366]

If you look at "my orders" you can see what's happening. They're not very good at updating it. but once it says "shipped", expect a Knock on your door very soon after. In the meantime, you can read-up on how to dish a wheel. You can even practice on one from the car-boot sale.

 

[Alan Quay]

Hi Mike. Not quite - although it is a steel framed road bike. What are now called cyclecross, but 20 years ago would just be a standard road bike. I wanted to be able to fit mudguards, large tyres, but still have drop bars for comfort and tucking out of the frequent Scottish wind, so this was the route I went!
http://surlybikes.com/bikes/cross_check

I like the look of that - should make a nice conversion. Always fancied a Surly myself....