Bosch 20t front sprocket

[Insider]

Hi all, where can I get this sprocket? They won't sell it to me, as I'm not a customer that have bought a bike from them...

https://www.e-bikeshop.co.uk/eBike-Spare-Parts/Haibike-OEM-20t-Bosch-Sprocket

 

[EddieJ]

I'm not sure why anyone would want to pay four times the cost of a Connex sprocket.

Connex are easily the best that I have used, and out last any other brand of sprocket.

http://www.connexchain.com/en/product/connex-e-bike-ritzel-fuer-bosch.html

If you are in the UK, you can order them via Ebay, or my preferred choice. http://www.bike-discount.de/en/shop/e-bike-sprocket-18334

They are compatible with both Shimano and SRAM. I use on both set ups, and also have written conformation of this from the Connex technical department.

You would need to buy a locking ring, but that is no problem. I even have two locking rings with the guard sitting here doing nothing, that I removed as soon as I received my bikes. More than happy to forward one on.
The guard is just a somewhere else to clog with dirt on an eMTB, although I guess that with a 20t sprocket, riding off road in mud, or hilly terrain isn't something that you intend doing much of. The gearing will sadly be too high.



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[Insider]

Why? That's because not everyone is well informed such as your self.

Thx for the info!

 

[Insider]

Can't seem to get anyone ship to the US....

 

[EddieJ]

This company come up on the Connex website.

 

[BurbManDan]

I agree 20t is unnecessarily large. I've found 18t on S-pedelec Bosch to be quite sufficient. I'm intrigued by the Connex brand claims of durability... What sort of mileage are you achieving with them, and what brand/model of chain?

I consistently see about 1500mi with Shimano ebike specific chain E6090 and aluminum front sprockets. I can normally run the sprockets for 3000mi, and then turn them around, for another go

 

[EddieJ]

aluminum front sprockets.

If your are running a post Classic Line Bosch motor system, then your front sprocket won't be aluminium. It wouldn't last the first ride.

 

[BurbManDan]

If your are running a post Classic Line Bosch motor system, then your front sprocket won't be aluminium. It wouldn't last the first ride.

I could be wrong (though it would be the first time)

So, what kind of longevity do you see from the Connex, and under what power level and typical conditions?