Rob North Framed Commando

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HondaRC30 fork tube showing inner damper rod stop, these usually have to be machined out for additional clearance for the cartridge kit

. Our current stock of Ohlins Cartridge kits and some springs. It helps to have a selection of parts to pick from
 
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The length of the stantion tube itself is 23 1/8".

Overall length installed is approx 29" from axle center to top of triple tree.

I dont know if this is if interest or helps re springs


29 inches makes more sense, that is 736 mm, I just finished a RZ350 which was 740 mm, so that is easy
You can see one of the problems with those long progressive springs, they bend out side to side, that rubs against the fork tube, causing friction, noise and wear. The wear makes the fork oil get dirty

You can see Ohlins uses a fork spring internal guide to try and avoid this, this is done in all Ohlins forks.
The Ohlins spring is much shorter.
ALL Ohlins fork springs are straight rate, NOT progressive.
We can discuss why that is, but just start with the spring is progressive and the Damping is not, so the damping curve cannot follow the spring rate.
The progressive spring can be used over a wider range of rider weight,.
A straight rate if it is correct for the rider weight along with the correct amount of preload, will work better.
 

lcrken

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Thanks for posting the pictures, Dan. I think I'll give it a try, and take you up on your offer to help. I'll get back to you on it. I'll start a new thread to cover the project. One question I have at the moment is the diameter of the damper tube and the bits at the ends of it. The Commando stanchion is only 26.12 mm ID. Will the NIX 22 cartridge fit? I'm assuming I'll have to turn down the nut at the top end and maybe the extension at the bottom end of the cartridge body.

For anyone interested who hasn't seen it already, this is a link to a thread several years back that I posted on the F4i conversion, and it also has some info on other conversions for the Commando forks. There are corrupted or missing images because of the Photobucket disaster back then, but the basic info is still there.

Ken
 

lcrken

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Sorry, I left out the link I referenced above. It is


Ken
 
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