BUILD 121 CNW

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Knut,

While it looks like a short amount of fork travel, the length of the tubes were calculated to allow for enough travel without having it bottom out. Of course, the fact that its a modern front end (internals) makes it so much more efficient than our older front ends. When I cut these tubes down, what goes away is the 'unused' section of the tube. As you can imagine, due to the long sliders and relatively short distance between the lower tree and top of the slider, these front ends are nice and rigid. Add the dual disc and you know there isn't any twisting either.

The stock fork springs are replaced by a 'Progressive' brand spring but they are not any stiffer than the stock ones

Rebound and dampening works great and I do have some larger guys really riding the Cafe's like intended

When first developed, I had an opportunity to get the Bostrom brothers (Eric and Ben, very accomplished racers) to put the machines to the test here in the Rocky Mountain twisties for a couple of days and they gave me very solid feedback on the handling, brakes and suspension. I figured, if they liked the fork set up, it would work great for us that spend more time on public roads than race tracks


Matt / Colorado Norton Works

www.coloradonortonworks.com
 
Fast Eddie said:
Strange line of questioning Knut!
4 inches of correctly sprung and correctly damped movement should be more than adequate IMHO and a quick look at the oil seal witness marks on my Commando shows 3 inches of travel (hopefully someone will chime in here with the correct travel amount for stock forks).

What's so strange? I am interested in improving the front end of my Mk3. Even though the CNW forks have a lot going for them, they may not be the answer to everyone's needs. I hope Matt will not take offence in me pointing at a potential deficit here. A design is always a compromise between different objectives. With his set-up, I think the design answers the needs of a "cafe bike" or a "cruiser". The front end may be less suitable on a touring or sport bike. Looking up travels on modern sport and touring bikes, most feature 5+in of fork travel. BMW airheads had a whopping 8in of fork travel, K-series about 140mm (approx. 5.5in). Citing Dyno Dave, the theoretical travel of the Commando's standard fork is 6.15in.

-Knut
 
That is one awesome bike , really nice , wow ! ... are you going to ride it or is it for display only ....
Craig
 
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