Just glanced at it, thanks! Very nice book... can't believe they used to "ice skate" to market back in the XVIII century... crazy!Miles wrote:"The Dancing Chain" is my favorite bike book..
This is good, too: https://books.google.co.uk/books?id=a4I ... ng&f=false
It's a worthwhile experiment, but keep in mind that so-called 1/8" (3.2mm) sprockets, for BMX and track bikes, actually measure about 0.100" (2.5mm) thick. The chains do have enough internal clearance for a 0.125" sprocket, but my impression is that using one makes them sensitive to alignment variation and inclined to stick or malfunction.Warren wrote:It would be much cheaper to double up cheap Sunrace cassette cogs. A quick, easy experiment. And it would tell us if 3.6 mm width would hang up in the chain on shifting.
That's 0.081" for the metric impaired.Miles wrote:Just measured a Surly 3/32" single sprocket - it's 2.05mm thick.
Miles wrote:Lots of info in this thread: https://endless-sphere.com/forums/viewt ... =28&t=8644
I have a design for a retro direct gearbox using a single planetary gearset. I finished the design work three years ago and made a prototype (it's not this one). That's as far as I've got. I wasn't convinced there was a market. My priority at the moment is electric motors....Hugh-Jassman wrote:so why doesn't some one manufacture a two speed gear box. there is definitely a market for them.
After many years of meeting electric bicycle big shots and pondering this very question, I have finally come to a conclusion on how to guarantee making a small fortune in the electric bicycle world...start with a large fortune.So, why doesn't someone manufacture a two-speed gear box. There is definitely a market for them
LMAO!!spinningmagnets wrote:After many years of meeting electric bicycle big shots and pondering this very question, I have finally come to a conclusion on how to guarantee making a small fortune in the electric bicycle world...start with a large fortune.So, why doesn't someone manufacture a two-speed gear box. There is definitely a market for them
Sure! bring it on. Have you considered building a 3-speed dog box? I imagine you could use two dogs, one on the front shaft between 1st and 2nd gear and one on the rear shaft between 2nd and 3rd. Shift cable movement would be easy. I would never buy it of course.. cause I'm always broke...Thud wrote:Is it time to unveil the latest 2-speed tranny design?
Been a long while since anyone has made a seriouse inquiry.....& of the 10 units built & delivered, the only guy who ever posted a build with one was Aussie Jester. (Heck he built two bikes with them) that & Etards road racer(which I built) is sitting in a shed somewhere in the desert.
The only guy on the waiting list is Danny Mayes.