2 speed

A while back I tried to build a 2 speed manual trans for my 79cc bike, I have since scrapped the idea. I want to build a 2 speed auto instead, but I really have no idea how to go about doing it. I have seen pictures of them made using 2 centrifugal clutches, but don't know how to do this. Can...

After building a few 79cc predator bikes for friends of mine and having them turn out far better than the first one I built for myself, I want to have the best bike again, so I'm starting a new build on an old trek 820 with a 21" frame that I got off craigslist for $150. I figure I'll keep my...

So I was looking around the other day and I came across this DIY 2 speed dog clutch: http://www.thepixelpump.com/widdershins/how-to-2speed-transmission.php Here's a closeup: http://www.thepixelpump.com/widdershins/images/gearbox-2.jpg It looks like a useful (and cool) thing to add to my...

So I was thinking it might be possible to convert my bike from having 2 gears in the front over to just one gear, then I could steal the front derailleur, modify it, and put it onto the motor chain and add a 46t sprocket next to my 36t on the rear hub, then fashion some sort of spring loaded...

Hey Guys & gals, I been building some Bikes for awhile now & get a lot of inquieries to produce my 2 speed trannys for consumption.....truth is I HATE production & I have a real Job & no interest in making these for anyone but myself....But I am more than willing to consult & offer up the know...