Originally Posted by
Maelochs
I like the idea of having an IGH as a sort of three-range auxiliary transmission.
One thing that has been missed in the gearing discussion is that a lot of trikes, especially Delta trikes, have 20" rear wheels. This has a profound effect on the gearing. For the better actually. Nicely low gears are very attainable with 'standard' crankset and cassette choices. Higher gears OTOH are much harder to come by and this is where the IGH supplemental final drive can really come to the rescue. Sadly, I know of no Delta set up that way. It makes for a really complicated (expensive) drivetrain with the need for a differential which is almost a must with the kind of extreme gear range possible with the additional IGH ratios.