4REEE
10 W
- Joined
- Apr 2, 2013
- Messages
- 81
The Bosch climbs the hill that the mac did at 15-16 mph...
Whoa!! Did I read that right?! You climbed a 20% grade at 15-16 mph on your new bike?
The Bosch climbs the hill that the mac did at 15-16 mph...
4REEE said:The Bosch climbs the hill that the mac did at 15-16 mph...
Whoa!! Did I read that right?! You climbed a 20% grade at 15-16 mph on your new bike?
I could just remove the hub and install a normal wheel...
4REEE said:I could just remove the hub and install a normal wheel...
And replace it with a Rohloff 500/14 Speed Hub.
o00scorpion00o said:...never thought it could be that but I am more inclined to think it's to do with the noise I hear in the video, which in the beginning is with me peddling with no motor power, so there is some kind of friction there somewhere. But maybe it is the hub ? I would like to think that if it was the hub that it would loosen up after a few miles ?
samsavvas said:I've put a lot of km on both the Sachs Orbit 2 speed and the later 3 speed/freewheel or cassette & derailleur set ups - both predecessors to the SRAM rear hub you have. You should experience no noticeable 'drag' from the hub, especially in the 2nd gear which I believe is direct drive. They are less efficient than a cassette/freewheel-only system but only marginally in every-day terms.
I have never seen a Bosch drive but I would suspect that any 'drag' you are experiencing with a brand new unit may well be associated with seals and o-rings wearing in. You may want to investigate this and either wait for further use to alleviate any friction or get some silicon grease and apply to said seals (if they exist).
Savvas.
o00scorpion00o said:I would be 95% certain it's the SRAM hub causing drag.
The Raleigh bike I tested for over 60 Kms in Germany was a lot easier to pedal with no motor assistance.
I am going to put a normal wheel on when the weather gets better to test and report back.
samsavvas said:o00scorpion00o said:I would be 95% certain it's the SRAM hub causing drag.
The Raleigh bike I tested for over 60 Kms in Germany was a lot easier to pedal with no motor assistance.
I am going to put a normal wheel on when the weather gets better to test and report back.
Well make sure you think it through carefully. The Dual-Drive employs the same 3 speed hub that has been in use for generations. It now just has different bearings and a free-hub grafted on to it. There are several reviews around (including ones by the CTC and by Frank Berto et al) that demonstrate quite clearly what 'drag' it contributes - and it isn't much. So the evidence is out there. if using a crank drive andsingle chain ring the Dual Drive makes a lot of sense. And as I have pointed out, 2nd gear is direct so the hub is behaving just like a normal multi-speed cassette unit.
Savvas
4REEE said:@o00scorpion00o: Your bike has the inverted motor layout. Have you had a chance to test ride the newer Haibikes? If yes, any difference in handling, etc?
o00scorpion00o said:I removed the SRAM dd 3 hub and sure enough it's much easier to pedal without the motor.
So this confirms what I was thinking all along.
I don't know why they can't make these geared hubs more efficient, I would imagine the Nuvinci hub to be a lot worse.
This has turned me off of geared hubs, why couldn't they just use normal front chainrings ? I suppose they think that people who buy the bikes would just use the motor most of the time and not notice it.