Bosch vs. Brose

mab13

Pedelecer
Jun 23, 2015
153
120
45
Peak District
Opinions sought from those who have experience of both please?

Perusing the 2016 ranges (as you do), I see that Bulls have the e-Stream Evo range coming soon with very nice visual integration and... a removable 650Wh battery!

The Specialized 2016 range will also use Brose, Rotwild use Brose, etc. but I've struggled to find any decent comparison articles or videos.

Any informed opinions would be appreciated and please point me to any decent online comparison reviews, etc.

Gracias. :)
 

soundwave

Esteemed Pedelecer
May 23, 2015
16,921
6,516
no its a right pita on there ;(
 

trex

Esteemed Pedelecer
May 15, 2011
7,703
2,671

Wisper Bikes

Trade Member
Apr 11, 2007
6,284
2,252
69
Sevenoaks Kent
We will be at the bike show with the Riese and Muller powered by Bosch bikes, Diavelo powered by Brose and the new Wisper Sport powered by the new Bafang mid motor... come and try them all, then try the Wisper Torque system, still probably my favourite for urban riding!

All the best

David
 
D

Deleted member 4366

Guest
Thanks... but I don't speak German. :(

Is there a quicker way to translate threads rather than laboriously copying and pasting into Google translate?
Use Chrome as your browser. It does it automatically.
 

soundwave

Esteemed Pedelecer
May 23, 2015
16,921
6,516
yes works on chrome still a pita tho
 
D

Deleted member 4366

Guest
I was looking at the stated torque figures. The Bosch CX 25 km/h is supposed to give 75Nm. Assuming a 18T crank sprocket and say gear 5 or 6 out of 9, which would give maybe 25 km/h at normal crank speed and might also have 18T, that would be a 1:1 ratio between the crank and the wheel, so the 75Nm would appear at the back wheel. At 25 km/h, that's 201 rpm for a 26" wheel, which means the output power would be about 1500W and the power from the battery about 2KW!

Clearly something isn't right. What is it?
 
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1boris

Esteemed Pedelecer
Sep 10, 2013
344
58
I was looking at the stated torque figures. The Bosch CX 25 km/h is supposed to give 75Nm. Assuming a 18T crank sprocket and say gear 5 or 6 out of 9, which would give maybe 25 km/h at normal crank speed and might also have 18T, that would be a 1:1 ratio between the crank and the wheel, so the 75Nm would appear at the back wheel. At 25 km/h, that's 201 rpm for a 26" wheel, which means the output power would be about 1500W and the power from the battery about 2KW!

Clearly something isn't right. What is it?
Isnt the torque measured closer to zero rpm.Doesnt that make sense with 75nm ?