Russell,
Will gearing be open? The stock gearing of 11×32 was used for the past two series and although Thunderslot is now making a 31t and 30t spur they are almost impossible to find. The Thunderslot spur gear has a diameter of 17.5mm where the NSR – using the same axle size – makes spur gears that are 17mm. I have not tried an NSR spur with a Thunderslot or a NSR pinion but that might be the solution to allow open gearing if that is the direction we would like to go.
You can find a bunch of Thunderslot plastic pinions in 12t or 13t but that is a big difference from the stock 11t.
Once again, I wonder if NSR gears would work. Thoughts?