TSDZ2 queries

[Mike_P]

Hello, I have fitted a TSDZ2 to a Ridgeback Motion hybrid. It came with a 44 chainwheel but pedalling unassisted indicates a need for two chainwheels (the hybrids original was a triple chainwheel), would a 44 and 34 be appropriate or is a 50 and 34 more suited? Aside from a 110 chainwheel is there anything else I need to be aware of? I note most are 8 speed or higher and and the hybrid is 7 speed so it would be useful to know if anyone has found a chainwheel that is okay with a 7 speed chain or would I need to change the chain as well.

I note that it can be set to use more than magnet for the speed sensor - are there any benefits from having more than one magnet? If so if there any specific spoke magnet to use?
Also is it 100% necessary to arrange the sensor with the cable exiting towards the bottom bracket, the only location where the gap is 5mm results in the wire being only a mm off the wheel with its set up as described.

Thanks
Mike

 

[DouglasXK]

TSDZ2 will come with a 42t chain ring. It is heavily dished to fit round the housing and I don’t believeve there is a chainring with fewer teeth which will work at a sensible price.

A single chain ring with a 11-46t cassette (10 or 11 speed) is a better bet.

Multiple magnets aren’t necessary.

There is a little arrow on the sensor and that’s where the magnet should pass over. Too close eg 1mm and you will get very odd results!

 

[Mike_P]

Thanks - mine was described as 44t (I've not actually counted it). I did have the sensor too close and initially it worked fine then after 25+ miles it started given overhigh speed readings so repositioned it.

 

[Mec77723]

I’ve the magnet for the rear wheel spoke but it’s too big it’s touching the sensor bafang kit is there an alternative option or another magnet that’s smaller ?