I developed a specific rear derailleur dedicated to Enduro bike. I included the NXS.
Patrice
@patriceb this looks really cool! Already some plans to make it fit the large 52t rings on the back? And what about the shifting speed? It has more engagement on the rings, but doesn’t that also mean that it takes longer to get the chain on a larger sprocket?
Truly impressed by your work!
Hi,
Thanks for your comments !
Yes, this derailleur can accomodate a 52 sproket. But from my point of view a 52 tooth is useless for ebikes (I only ride now ebike). The reasons are as follows: My last bike was equipped with 52t but I found out that I never used this sprocket even on hard slopes. The tooth repartition on a 52t (the last 3 sprocket) is 33/39/45/51 but with a 45 tooth (what I use now ) is 32/36/40/45. So the gap between each sprocket becomes 4 teeth instead of 6. So the tuning is much better. The other reason is that I am practicing Enduro. So I designed the derailleur to be as compact as possible (lateral footprint and ground clearance). With a 45 tooth sprocket the cage length is reduced. Enclosed a picture to describe the lateral foot print. The derailleur is with the swinging arm envelope!
Speed: before installing the NXS I was using a cable version. The shifting is rather slow, but it is permitted to shift under full load during hard slopes without any noise (compared to shimano XT that was impossible). To include the NXS I designed a friction free derailleur. That means that all the articulations are mounted with ball bearings (4x7x3). The target was to reduce the electrical consumption. The shifting is instantaneous ! It is in fact too fast and some disturbing noises rise during shifting under load. I am working on this aspect to reduce this noise.
The chain engagement is part of the improvement of the derailleur design. The target is to reduce the effort/teeth in term to reduce chain wear, particularly important on ebikes.
I hope I answered your questions.
I am a bit lost by using OG communication tools. If you need the Step files for the shifter, send me your mail address. My own my patricebonnelye@gmail.com
Patrice
