I didn't update this thread because I started putting the material in a Front Freewheel Mod thread.
https://www.retrobike.co.uk/threads/rapid-rise-vs-front-freewheel-or-both.473844/page-5#post-3617149I ended up with a 1x11 42t to11-42t Prestacycle HG11 lightweight cassette, and SLX deraillleur with SRAM gripshifter. (My 2004 Mavic Crossrides have that cassette spline already).
The ZTTO cassette was crap.
Some Rene HERSE 26x2.3 Extralight slicks finished it off. The White ENO custom FFW setup won out over Rapid Rise on the pedal bike. But it's still in play on the urban Ebike which has FFW mod also.
FFW= Shift with or without pedaling, real time shifts up or down, multiple gears with a gripshifter. Can't shift when stopped.
Rapid Rise= Can preselect downshifts w/o pedaling (pedal it into gear just before you stop). Can down shift when stopped if needed. Goes into gear when you take off gently.
FFW+RR= Any gear any time ( Like an IGH) Downshift when stopped, still need to take off gently.
RR up to 8 speed is affordable and easy to do. FFW on the converted mid drive Ebike is already there. Just a zip tie hack to activate it ( plus chain management/ false chainline upgrade).
The ENO FFW mod is a hardcore and pricey project. The ENO Ebike freewheel seems to be NLA now. But it was a bolt on project. It can still be done with the budget freewheel that comes with the tandem stoker freewheel crank from SJS Cycles. Creating a false SS chainline for a derailleur is not too hard but adds to the cost to do it properly. SJS recommends an IGH for these cranks.
The Intend Magick Cranks custom FFW setup is much more expensive than the ENO mod.....
https://www.intend-bc.com/products/rocksteady-magic/?v=0b3b97fa6688