104 tooth chainring

[vorsprung]

to go 80mph

http://www.theguardian.com/environment/bike-blog/video/2013/aug/09/bike-blog-experiments-speed-video

[drossall]

I remember a club mate of mine borrowing a ring like that to have a go at a roller speed record.

[rogerzilla]

There are more compact solutions involving an intermediate BB and chainrings (Wobbly John has probably knocked one up), although they're the teeniest bit less efficient.

[robgul]

I saw a couple of speed record attempt machines in a French museum - MASSIVE chainwheels ... apparently the rider had to pushed to start by a bloke on a motorcycle with a thing that looked like a broom pushing against the bike saddle.  Can't remember the speed attained.

Sadly the museum, at Cormatin in Burgundy, is no more.

AND just before the M42 south of Birmingham opened there was a cycle speed attempt with a big chainwheel - I think the rider was following a Rover SD1 with a shield on the back to get up to speed before the car pulled to one side.  Must have been quite a sight.

Rob

[bobb]

AND just before the M42 south of Birmingham opened there was a cycle speed attempt with a big chainwheel - I think the rider was following a Rover SD1 with a shield on the back to get up to speed before the car pulled to one side.  Must have been quite a sight.

That was Dave Le Grys:

https://www.youtube.com/watch?v=BmpxJWAJbFM

[Cudzoziemiec]

I love the "shed for sale" notice at the end of that vid.