Quote:
Originally Posted by Infinity2718
The shafts were placed in the center of the tubes for gear clearance, but with the incorrect ratios used from the above posts, things could be shifted. The first thing that comes to mind are a few gears external to the frame to give the correct ratio.
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I've been playing around with similar concepts, and yours is definitely a cool way to tackle the problem. I'm not sure what your other design constraints are, but if I were you, I'd look into moving the final stage of gearing (I'm assuming you'll stick with the two stages) to the outside of the tube (between the two center wheels), an adding a gear onto both center wheels on either side of the drive. This should free up some of your gearing options on the second stage, and I'd imagine you could bump the final gear all the way up to a 60(or 64/66 depending on how much clearance you can live with) to get a bit more reduction going. There's also the added bonus of not necessarily needing live axles on the center (4) wheels - or any wheels for that matter - meaning that you might end up netting a bit of weight savings while you're at it.
It's also worth nothing that VP will be selling an 11 Tooth Pinion (and 13T) during the 2014 Season, and they're kind of Magic when it comes to squeezing a little extra reduction out of a tight box.