I’d like to share with you my adaptation of these drives for Surf Rodz RKP. The spiral gear drives have been out for a while following the development (@MorrisHsu) and group buy last year. Though I haven’t really seen anyone using them on the regular. Owning the kit myself there are a few obvious reasons why.
On the original assembly this part (in red) was one of the weakest links. Too much play and not a great fit, with cast Calibers you can only expect so much. This setup didn’t really lend itself to much confidence and is only really due to using Calibers to start.
I opted to adapt these to Surf Rodz using this press fit design as the basis.
After a bit of prototyping this was the result:
The wheel gear is now supported by an extra bearing that fits perfectly within it and has a 10mm ID. (NSK Bearing for Ford 6G 10x27x11)
This setup also allows for a very tight package with 6380s on an Evo. Still get full lean without touching:
I’ve put about 200 miles on these drives and they’ve been great so far. No issues. The goal sort of evolved into building the most bad-ass looking Evo once I realized how well everything could come together. (12s4p 40T, Dual Escapes, TB 6380s)
If you are interested here’s the file (you’ll also need that bearing that I linked above):