Author Topic: E assist for Twin Raven  (Read 407 times)

Mike Ayling

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E assist for Twin Raven
« on: October 23, 2021, 07:17:16 AM »
The Rear Admiral wants e assist.
Obviously we want to retain the Rohloff so we either go mid drive or front wheel..
I assume that with a mid drive we loose the front ebb so we rely on the rear ebb to tension the timing chain resulting in a problem tensioning the drive chain.
The Rohloff chain tensioner replaces  the derailleur hanger which we don't have a hole for installing one  so what other options are there?
Front drive also has complications with cable removal when using the S&S couplers to didvde the bike for transport.

Any advice please?

Thanks

Mike

Danneaux

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Re: E assist for Twin Raven
« Reply #1 on: October 23, 2021, 08:13:02 AM »
Mike,

A quick online search brought up a Pinterest link showing a "Thorn Raven Split tandem electric bike conversion" by Electric Bike Conversions in the UK: https://electric-bike-conversions.co.uk/

Attached below is a photo from their Pinterest gallery ( https://www.pinterest.co.uk/electricbikeconversions/_created/ ). It is not the clearest but does show a powered front hub, which would appear to solve many of your potential issues because it leave the eccentrics unencumbered.

I'll keep an eye out for more examples but it might pay to drop a note to the folks who did the conversion to see if they ran into any particular issues.

Best,

Dan.

Danneaux

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Re: E assist for Twin Raven
« Reply #2 on: October 23, 2021, 08:17:47 AM »
Mike,

These folks also claim a Raven Twin conversion:
https://www.electricbicycleworld.com/electric-conversion-by-brand/

Another here, with photos:
https://www.pedelecs.co.uk/forum/media/ezee-powered-thorn-raven-tandem.401/

Hope this helps.

Best,

Dan.

rualexander

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Mike Ayling

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Re: E assist for Twin Raven
« Reply #4 on: October 23, 2021, 09:39:34 PM »
Thanks everyone for the replies.

I am in Melbourne Australia and I will show the pics to my local conversion people.

Mike

Andre Jute

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Re: E assist for Twin Raven
« Reply #5 on: October 23, 2021, 10:54:19 PM »
The Pendix Thorn sells, already linked above, is a neat solution. But it is expensive.

i've made a couple of installations of bike electrifying kits and one of the problems is routing the wiring unobtrusively. One presumes a kit sold by SJS for named Thorn bikes will have adapted or adaptable wiring. An SS installation much more so!

Even after making two successful electrical installations myself, I really wouldn't like to tackle an S&S installation. Make sure up front that your installers understand that only the neatest installation will be acceptable. Neat wiring will take time and cost money.

Rohloff has a whole bunch of torque reaction methods, not all of which use the fixing socket for the jockey wheel of a derailleur. The image below is a visual summary of the most useful. The original, which I have failed to find on the Rohloff site, was linked to parts lists required for the installation and was a complete selection tree at "Forward" in the bottom right hand corner. If anyone knows where to find the original self-contained app on the Rohloff site, please share.

Good luck.
« Last Edit: October 23, 2021, 11:13:41 PM by Andre Jute »