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Cannondale Simon

Cannondale reveals long-term computer-controlled damping project


Posted: 24 September 2009
by Mike Davis

Cannondale has unveiled the results of a five-year project to develop a fork with electronically-controlled damping. Called Simon, the fork - which is built into the familiar Lefty chassis - uses an accelerometer at the bottom of the single leg to measure "terrain input" and motorised valving that can adjust oil flow every two milliseconds.

With damping controlled by computer rather than shim stacks, the system can behave in all sorts of ways. Cannondale has programmed the controller with a series of "maps" that determine what it does under different conditions, with four different settings including a "Travel Management" lockdown mode.

Despite the name, Simon isn't operated by pressing illuminated coloured buttons in the correct sequence. The interface does have something in common with the popular late-70s MB electronic game, however. The bike computer-sized display features four indicators around the edge for the different modes, plus one for lockout in the middle. Choosing between them involves the use of a tiny joystick-style controller on the bars, which sounds ridiculous but doesn't require all that much dexterity - it's only a matter of clicking it up, down, left or right, making it more of a two-axis toggle switch than a joystick. It's not entirely clear why Simon needs a big LCD status display - you can't help thinking that simple LED indicators on the controller itself would do just as well.

This isn't Cannondale's first foray into fork electronics - a few years back it had an electrically-actuated lockout button, the ELO. Simon is a considerably more ambitious project, although again the idea of electronically-controlled damping isn't unprecedented in the bike industry - K2 put out a range of bikes with battery-operated piezo-electric blow-off valves in the fork damper about ten years ago. It didn't take off back then, but clearly Cannondale's system does rather more.

Whether it'll actually add anything in real-world conditions beyond what can be done by conventional means is open for debate, but it's certainly an interesting approach. We'll have to wait a while to find out, though - while Cannondale anticipates Simon reaching production, it'll only say that "it's some way off".


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Discuss this story

Whoa that's pretty crazy...what a crap name though!
Posted: 24/09/2009 10:08

I fully expect future Cannondale products to be called Kevin, Barry and Wayne.
Posted: 24/09/2009 10:55

Oi, there's nowt wrong with being called Simon.


Posted: 24/09/2009 11:01

Unless you are a mechanical object. At which point you lose all credibility and sound like you are mates with Thomas, Hector, Harry and The Fat Controller.


Posted: 24/09/2009 13:55

You say that, but me and Dave the Bottom Bracket are good pals now. We treat each other with mutual respect.
Posted: 24/09/2009 16:21

Simple.........
Posted: 24/09/2009 16:33

............says
Posted: 24/09/2009 16:34

That bloke sells some damn fine pies though.
Posted: 24/09/2009 16:44

When do you go out riding then go for an XC ride maybe a bit of AM then do some DH all in one day which would require a fugly big screen and switch on your bars?

Sure a little discreet switch inside the top cap but it's not really warranting a screen to say you're using XC, AM or DH

Now if you could map your own settings via PC and the load them into the screen and you could select your favourite settings and switch them...now that would be cool


Posted: 28/09/2009 18:55

I'm pretty sure if it was as smart as they claim there wouldn't be any need to manually change the settings at all. There's no point in adding more complexity to a device unless it simplifies the user's interaction with the device or provides a massively better performance (which I doubt, mainly because suspension already works pretty well).

By fitting strain gauges/accelerometers to the top and bottom of the fork and a fork position and tilt sensor, with possibly a steering angle sensor too, it would be possible for the fork to determine whether it's being moved by the rider standing up and stomping or by bumps from the ground (With a bit of maths the superposition of these effects can be separated too) and what the fork is being used for and how it is being used. Once this distinction can be made, the fork will be able to respond correctly to input conditions from the point of view of lockout and damping levels.

Getting the fork to adjust its own preload, travel/length, sag and ramp rates responding to rider weight, technique and conditions (Different behaviour for a string of drops or under braking than for a rough twisty trail) as you use it would provide genuinely useful functionality that couldn't be easily copied by a fully mechanical system.

Changing the damping electronically to different settings depending on the rider's choice is likely to be no different to the likes of Marzocchi's TST as far as most users are concerned.


Posted: 01/10/2009 13:07

It's supposed to be doing slightly more than just changing settings via a little switch, but in essence I agree - it needs to do more than slightly more, ie something more which the user can actually notice. Still, early days


Posted: 01/10/2009 14:46

Holy crap...just googled this Looks like cannondale have thought of everything! 10,000 settings! it's full on totally programmable, 5years of development: http://www.youtube.com/watch?v=B-73JWF82G4&feature=related
Posted: 15/10/2009 11:31

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