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BUILD 121 CNW

Classic Norton Commando Motorcycles.

Re: BUILD 121 CNW

Postby mdt-son » Wed Apr 19, 2017 4:16 am

Richard Barks wrote:Check Out Build 121 at Colorado Norton Works Gallery
Its a Humdinger !!!!!!!!
Even better than that its Mine ......................


Hey Richard and Matt,

Congratulations on an extremely tasty build!

I am curious about the fork sliders you have chosen. Which brand are they, and did you retain the 35mm stanchions off the Commando? The triple tree appears to be Norton items.

Thanks,

Knut Sonsteby
Assorted '60s Matchless models
'75 Norton Commando Mk3 (coming together)

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Re: BUILD 121 CNW

Postby cNw » Thu Apr 20, 2017 7:17 am

mdt-son wrote:
Richard Barks wrote:Check Out Build 121 at Colorado Norton Works Gallery
Its a Humdinger !!!!!!!!
Even better than that its Mine ......................


Hey Richard and Matt,

Congratulations on an extremely tasty build!

I am curious about the fork sliders you have chosen. Which brand are they, and did you retain the 35mm stanchions off the Commando? The triple tree appears to be Norton items.

Thanks,

Knut Sonsteby


Knut,

Pretty much the whole front end is a unique cNw set up. It is based on Showa 39mm sliders but the tubes are modified and I also designed it so that it doesn't use the std hold down, where both the upper and lower tree clamp to the tube. Rather, it has a separate tapered top collar that slides over the fork tube and then up into the upper clamp to seat (like an original Commando). This gives a much cleaner and unique look. I also put a fill hole inside the top cap of the tube, so by just removing the top fork nut (this wont collapse the fork like a stock set up) you can access this fill hole and fork oil service is now a really straight forward operation where nothing else has to be removed. Drain the bottom and refill on the top.

The hub is also a cNw billet piece. Front axle and spacers are custom to work with the hub and Showa legs. Hub uses 2 double row bearings

The triple trees are also unique since they have to work with the 39mm. Essentially a 'blown up' version of my std billet trees. The lower clamp as an internal, 2 into 1, brake junction. So the lines for the calipers just hook up to the lower clamp that then combines into one that exits on top of the clamp

Finally it uses a post type headlight mount rather than tube clamps.

Brake system is a dual Brembo using 320mm rotors, 4 pad calipers and a radial master cylinder.

This is the front end I developed for the Ltd Edition Cafe's but since so much time and money was invested, I decided to keep offering this front end as an option on my builds

Thanks

Matt / Colorado Norton Works

www.coloradonortonworks.com
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Re: BUILD 121 CNW

Postby zefer » Thu Apr 20, 2017 10:54 am

yep.....standard issue for Matt....I would argue with anyone that it would be hard to find a better, well sorted,pretty,fast,nimble and user friendly Norton than one Matt built....I am lucky enough to have # 012....just had matt do a bunch of nice upgrades....love your machine,the "lipstick red " frame is...well....kinda sexy... really !! I am coveting your front end,really nice.I am waiting to hear from Matt about the same set up for 012
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Re: BUILD 121 CNW

Postby mdt-son » Fri Apr 21, 2017 1:07 am

Hi Matt,

Thanks for the detailed answer. The hub and brake arrangement is very intriguing! I am sure the front end would be of interest to others if you were to sell it as a separate product.

One question arose though: The fork's travel seems rather limited - in the region of 100mm (4 in) I guess, maybe less. This is probably adequate for highway use, but how do you prevent bouncing when riding the bike across a speed bump or hitting a pothole? Fitting springs with a high spring rate (lbs/in) wouldn't make for a pleasant ride I guess. What's the secret?

Regards,

Knut Sonsteby
Assorted '60s Matchless models
'75 Norton Commando Mk3 (coming together)

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Re: BUILD 121 CNW

Postby Fast Eddie » Fri Apr 21, 2017 3:33 am

mdt-son wrote:Hi Matt,

Thanks for the detailed answer. The hub and brake arrangement is very intriguing! I am sure the front end would be of interest to others if you were to sell it as a separate product.

One question arose though: The fork's travel seems rather limited - in the region of 100mm (4 in) I guess, maybe less. This is probably adequate for highway use, but how do you prevent bouncing when riding the bike across a speed bump or hitting a pothole? Fitting springs with a high spring rate (lbs/in) wouldn't make for a pleasant ride I guess. What's the secret?

Regards,

Knut Sonsteby


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).
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Re: BUILD 121 CNW

Postby cNw » Fri Apr 21, 2017 7:28 am

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

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Re: BUILD 121 CNW

Postby mdt-son » Fri Apr 21, 2017 10:42 am

Fast Eddie wrote:
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
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'75 Norton Commando Mk3 (coming together)

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Re: BUILD 121 CNW

Postby Craig » Fri Apr 21, 2017 1:13 pm

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