S Pedelec with SRAM dual drive
- Thread starter 103Alex1
- Start date
Hi. I only know of two which are available, both are Bosch drive units. The Haibike xDuro Trekking SL and also the Hercules Robert 27 Pro which you would have to import from Germany but offers a considerable cost saving (try eBay).
Both bikes have SRAM dual drive 3 x 9 = 27 gears and are nearly identical in their other specifications.
Both bikes have SRAM dual drive 3 x 9 = 27 gears and are nearly identical in their other specifications.
Thanks Allan_B ... is this the one ?
http://www.hercules-bikes.de/de/Hercules-Ebikes-und-Fahrraeder-im-Detail-160,204,20486,detail.html
I'm interested in trying a 350W S-Pedelec with the SRAM Dual Drive - most likely wouldn't buy another 250W crank drive eBike as what I already have will do for a few years yet.
I'm no fan of Nuvinci, Rohloff-equipped eBikes are beyond my meagre means and as power goes up the Alfine-11 isn't such a good match. The SRAM-dual is the only technology at the moment which has my attention, but not in a 250W.
http://www.hercules-bikes.de/de/Hercules-Ebikes-und-Fahrraeder-im-Detail-160,204,20486,detail.html
I'm interested in trying a 350W S-Pedelec with the SRAM Dual Drive - most likely wouldn't buy another 250W crank drive eBike as what I already have will do for a few years yet.
I'm no fan of Nuvinci, Rohloff-equipped eBikes are beyond my meagre means and as power goes up the Alfine-11 isn't such a good match. The SRAM-dual is the only technology at the moment which has my attention, but not in a 250W.
D
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Andrew found some reliability problems when using the Sram Dual Drive in his pedicabs, some broke very quickly, so be careful about how much torque you put through it. The pedicabs had front motors, so it was only human power going through the rear hub.
http://www.pedicabshop.com/blog/sram-dual-drive-good-or-bad-solution-for-pedicab-and-rickshaws.html
http://www.pedicabshop.com/blog/sram-dual-drive-good-or-bad-solution-for-pedicab-and-rickshaws.html
I'm not surprised at this in pedicab use where the lowest gears will come into play. The combination of the largest rear sprocket driven by a quite small chainwheel will result in the torque limits of hub gears being exceeded. True of all makes and why Shimano won't make rear sprockets over 24 teeth for their hub gears and have rules on the chainwheel to rear sprocket size ratios.
I'd be nervous about putting motor drive through a Dualdrive if very low gear use is contemplated, especially if a higher power crank unit.
I'd be nervous about putting motor drive through a Dualdrive if very low gear use is contemplated, especially if a higher power crank unit.
Yes, but it's available at Eu 1898 elsewhere (plus shipping). Having bought one recently I haven't had any problems yet, although the Dual drive element isn't necessary for where I live (Manchester), it was bought to cater for future touring use so early days yet. It's easily deresticted.
As far as 350W availability goes again you'd need to import and you'd be restricted to a Haibike such as http://www.elektrofahrrad-einfach.de/products/Elektrofahrraeder/Haibike-Xduro-Trekking-S-28-2014.html
As far as 350W availability goes again you'd need to import and you'd be restricted to a Haibike such as http://www.elektrofahrrad-einfach.de/products/Elektrofahrraeder/Haibike-Xduro-Trekking-S-28-2014.html
Mmmm ... if I was going for a derailleur option and settled for a Bosch it wouldn't be a Haibike it would be one of these - which I can pick up in UK no problem :
http://www.50cycles.com/product/613525400
http://www.50cycles.com/product/613525400
I agree with Alex, I've had the same machine since the start of the year. I can't recommend it enough.