GSM Motor Gear Change Sensor

My first test rides with a GSM crank motor and have found it very different to my usual hub driven bikes to use.

Me and the motor did not get on with changing gears with the motor under load which it generally always was, I could not get to blip the brakes and change gear in time so always ended up with a clunk.

Since I'm using a KT controller I cannot just plug in a BBS gear sensor.

But I come up with a solution using a BBS gear sensor and I don't want to cut the cable on the expensive gear sensor either.

So cut the socket off a cheaper BBS brake wire 'Y' adaptor and solder on an old HWBS wire 3 core cable with a jst plug on the end,

Connection is red to red, black to black, then the other colour is signal to signal.

 

Connecting this to the KT controller brake sensor circuit really has transformed the bike for me and has been a well worthy project.

 

Obviously when going really slow under load you still get the clunk because the grears haven't had time to change before the power returns.

Edited June 27, 20187 yr by awol

Nice solution awol.

If it clunks you're doing something wrong

 

On a road bike it doesn't so I guess you are riding off road? I am using a 7 speed Acera derailleur at the moment with an 11-32 cassette (a 12-32 actually but I swapped the small gear).

the gearsensor on the Krieger is a bit like two HWBS mounted head to head so that it detects the movement in both direction.

If anyone wants one, email support@wooshbikes.co.uk

picture:

http://wooshbikes.co.uk/2017/krieger/gearsensor.jpg

Edited June 28, 20187 yr by Woosh

On a road bike it doesn't so I guess you are riding off road?

Yes, it's going to be more for off road use.

I never knew there was one already available from Woosh, guess I will ask first in future.

In other threads I got cheeky remarks about my superior shifting technique but I have only been using click shifters for about 3 and a half years! Shifting on the trike without a motor goes clunk and I have that down to the quality of the rear derailleur and/or the precision of the shifter. There is an awful lot of cable between the shifter and the rear derailleur too. We shall see what adding a motor to the drive-train brings.