27 gears on an E-bike?

[Peter Thornton]

Just browsing a few sites and I come across the "Haibike Xduro Trekking Pro"

It has 27 gears, by combining a 9 speed derailleur with a three speed hub gear. It doesn't appear to be marketed in the UK. Has anyone seen one of these?

 

[chris_n]

I think its a 2015 model, not listed on the Haibike international website.

 

[jhruk]

I think this model used to use the Sram Dual Drive system. Unfortunately it appears Sram is ceasing production of all hub gears, including the Dual Drive.

http://www.bike-eu.com/sales-trends/nieuws/2017/2/sram-stops-remaining-internal-gear-hub-production-10129065

There was always a problem using it with crank drive motors anyway as the hub gear had limited torque capabilities and the motors often had to be de-rated to comply. It certainly wouldn’t cope with the latest high torque motors now available from Bosch, Yamaha, etc.

 

[Trevormonty]

The CX drive should have enough grunt with 9-10 spd 11-40t cassette to haul a fully load touring bike up any sealed road hill. Of course if you are serious about touring then rolhoff hub is only way to go.

The advance of rolhoff is any hill can be tackled in Eco for when battery range is critical.

 

[flecc]

Sram is ceasing production of all hub gears, including the Dual Drive.
.

Sturmey Archer have taken up this baton with their own version:

http://www.sturmey-archer.com/en/products/detail/cs-rk3-silver

The restricted 177% range of the hub indicates the internal gearing is probably tougher than the usual 200% for 3 speed IGHs, different gear sizes.
.

 

[anotherkiwi]

The SA is pretty good. Say you have a 53-38 mounted on your Bafang, GSM whatever with a 26"wheel at cadence (80-90) that gives speed range between 8.5 km/h and 66.5 km/h with an 11-34 cassette (max recommended by SA).

 

[grldtnr]

The SA is pretty good. Say you have a 53-38 mounted on your Bafang, GSM whatever with a 26"wheel at cadence (80-90) that gives speed range between 8.5 km/h and 66.5 km/h with an 11-34 cassette (max recommended by SA).

Fast enough for me!
By the way ,the SA ,of old were very tough and hard wearing gears,pulled s fair few down, you have to be carefull with the pawl springs, they are very small and delicate.

 

[jerrysimon]

Sturmey Archer have taken up this baton with their own version:

http://www.sturmey-archer.com/en/products/detail/cs-rk3-silver

The restricted 177% range of the hub indicates the internal gearing is probably tougher than the usual 200% for 3 speed IGHs, different gear sizes.
.

I have an SRAM (Dual Drive) built into one of my Moultons. Lovely combination. Didn't know SA now made them as well.

Jerry

 

[anotherkiwi]

I have an SRAM (Dual Drive) built into one of my Moultons. Lovely combination. Didn't know SA now made them as well.

Jerry

https://www.sheldonbrown.com/sachs-internal.html

 

[flecc]

I have an SRAM (Dual Drive) built into one of my Moultons. Lovely combination. Didn't know SA now made them as well.

Jerry

Now Sturmey is the only one Jerry, SRAM have given up making hub gears and the DualDrive.
.