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Years of experience.

If the amazon controller came complete with lcd and all the other bits then send the whole lot ack for a refund and buy all again from a same source. One can still likely buy from amazon using the voucher but just a more suitable kt controller with the 9 pin julet hub connector.

It is best to test and fault the reason before willy nilly swapping stuff out.

One can probe the back of the wire connectors if they are the small block type jst connectors, for throttle one should see 4.5 - 5v between gnd & 5v and about 1v between Gnd & sig when the throttle is operated, like wise with the pedal sensor should see the voltage switch as the magnets pass the...

Throttles are mainly made by Wuxing company China and can have any connector on the end the client wishes, the ft21x is a Wuxing. With the switch kit there is no guarantee that third party one will work esp if the pin outs are changed. If one isn't to bothered then the simple option is to cut...

Before buying anything clearly set out your goals for the bike. Riding terrain, speed, voltage, the first two will decide on the motor winding one will need to deliver the performance expected. No use living or riding in hill terrain expecting fast speeds and also buying an incorrectly wound...

Voilamart = fairly cheap which = crap control systems. The hubs are either weak 250w ones or 1kw nasties that need high current and a good £400 -500 battery. Never yet had a 50+ day wait for AliExp delivery most stuff is 14 - 21 days.

Like pc2017 amazon is the most unlikely place I would ever buy from, it is one of the worst market places to buy from.

Frankly you probably have cost yourself more money by not speccing you build properly and the goals you want to achieve from day one. One should source the motor first (or even a kit) , once the motor is found one needs to source that a compatible controller system is found that will match the...

You need to be sure that battery can deliver 35a continuous other wise money down the drain.

That three pin motor cable connector on the controller is old hat stuff and for that is unsensored and rare to find a hub nowadays. Quite surprised some one is till selling a controller like that with only a three phase connector.

The 74mm std used on most bikes inc hybrid etc are simply taken from MTB use where they first appeared on heavier bikes, flat mount disc brakes for lighter road/gravel bikes don't need the over sized brakes so the 43mm smaller mount was agreed upon as a std for these bikes and 160mm rotors as...

Most definitely in ali drop outs, though one is plenty for 250w on the non drive side. It is just to prevent hub axle rotation within the d/o and twisting/sanpping the motor cable, preventing hall sensor damage in the motor and mosfet failure in the controller should the motor wire short out.

Front hubs deserve a nice steel fork over an ali one, with steel no need for torque arms but with ali, torque arms are a must to prevent face plants.

One may even find with the front mt200 a std post mount to post mount 180mm adapter may not work, the cost is small so no harm trying though.

The front looks to be a std post to post fitting at 74mm spacing , the rear is a flat road/gravel bike spacing so should be 43mm. The rear leave as is and just upgrade the front as the front should be doing the most braking if one is braking correctly, brake bias is often 70/30 to the front...

Battery indicator bars are wholly unsatisfactory way to gauge battery % remaining, they will always go up and own like a yoyo depending on voltage sag. The best one can get from bars or led's is that the range may be within 25% of an estimated voltage. With four bars one can take a guess that...

I suspect like the GSM shutting down is due to heat issues and thermal cut out, the tsdz2 at least has it's many fans as a TS system and remedies are at hand to overcome these issues.

The BZ10C is the one I have found always to be the best option, reliable and works all the time for me.

Billyboya managed it on his scooter, it is a faff but doable with patience.