rear suspension

Classic Norton Commando Motorcycles.

rear suspension

Postby kickstart » Tue Dec 17, 2013 2:51 pm

it sounds odd, but I don't have any shocks at the moment and am rebuilding the frame, does anyone know the travel of the standard shock on the 850?
cheers, I will try to get a pic on this one day.
Norton '71 Fastback
Norton 74 850 mk2a, and still being played with
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Re: rear suspension

Postby Rohan » Tue Dec 17, 2013 6:44 pm

Same travel as on the 71 Fastback. ?

The std Girlings only had about 2" of travel, taking into account the rubber bumpstops.
Don't forget they were angled, so the swingarm travels further...

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Re: rear suspension

Postby acotrel » Wed Dec 18, 2013 2:05 am

The drop of the rear shocks changes the steering head angle, thus the trail. It affects whether the bike runs wide in corners or tightens it's line.
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Re: rear suspension

Postby Rohan » Wed Dec 18, 2013 2:11 am

No kidding ??

What do you suggest ?
Rigid rear suspension.
Anti dive suspension.
Self levelling suspension.
Constant wheel base suspension.

Or just ride it and enjoy it.....

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Re: rear suspension

Postby kommando » Wed Dec 18, 2013 2:21 am

Ikon provide all the information, their part number for the Commando shock is 7610-1653, this link takes you to a pdf which provides all the dimensions.

http://www.ikonsuspension.com.au/download/details.pdf
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Re: rear suspension

Postby acotrel » Wed Dec 18, 2013 2:29 am

I suggest having a talk to other commando owners and asking about the natural steering tendencies of their bikes, and record spring rates and shocker lengths. I'd try to find a setting which tightens the bike's line slightly when coming out of tight corners gassing it hard. It is an age old habit to accept the manufacturer's original settings and simply ride around bad handling . It happens in historic racing all the time along with incorrect gearing. You can ride a standard bike and love it even though it is a slug. Why would anyone ride a Harley unless they were deluded ?
Doug Macrae rides a racer with mainly commando parts - ask him where his bike tends to go when he relaxes.
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Re: rear suspension

Postby Rohan » Wed Dec 18, 2013 2:36 am

Commandos make a very pleasant steering road bike in stock form - even if the steering is a little strong willed and slow.

P.S. Where did this talk of bad handling come from ??
You have previously said you have NEVER ridden a stock Commando ??

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Re: rear suspension

Postby ashman » Wed Dec 18, 2013 2:59 am

Here we go again.
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Re: rear suspension

Postby petejohno » Wed Dec 18, 2013 3:10 am

Yeah, were all getting a bit sick of this constant arguing between you two. If you can't make a constructive comment don't bother posting :evil:

BTW: I've run IKON's ( formally KONI ) tri-rates for years on all my bikes and swear by them.
' 75 MK111 Commando Interstate
' 68 Triumph T100R Daytona
' 74 Rickman Honda CR750

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Re: rear suspension

Postby olChris » Wed Dec 18, 2013 3:26 am

Rohan wrote:No kidding ??

What do you suggest ?
Rigid rear suspension.
Anti dive suspension.
Self levelling suspension.
Constant wheel base suspension.

Or just ride it and enjoy it.....


:D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D :D

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Re: rear suspension

Postby olChris » Wed Dec 18, 2013 3:30 am

kickstart wrote:it sounds odd, but I don't have any shocks at the moment and am rebuilding the frame, does anyone know the travel of the standard shock on the 850?
cheers, I will try to get a pic on this one day.


Would a photo of a bare frame with the swing arm position at upper and lower limits help, or do you want to know how much the shock travel within those limits...

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Re: rear suspension

Postby Rohan » Wed Dec 18, 2013 3:51 am

Can someone even make constructive comments about Commando handling - if they've never ridden one ??
A constant diet of negativity just doesn't go down real well...

I've only ever ridden Commandos with Koni's.
Had a set rebuilt the other day, might be while before get to try them though.
Are the Ikons as good ?

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Re: rear suspension

Postby olChris » Wed Dec 18, 2013 4:11 am

Rohan wrote:Can someone even make constructive comments about Commando handling - if they've never ridden one ??
A constant diet of negativity just doesn't go down real well...

I've only ever ridden Commandos with Koni's.
Had a set rebuilt the other day, might be while before get to try them though.
Are the Ikons as good ?


Well this is worth a try

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Re: rear suspension

Postby acotrel » Wed Dec 18, 2013 11:26 am

I did not suggest that commandos have bad handling. Rohan has said I have never ridden one and would not know. My comments about rear shocks were general and apply to any bike. In the past I have commented about isolastics, and the fact that a bike which relies on the motor head steady for good handling is not something that I want to ride. I have not yet seen a thread started on here by others which relates suspension settings to handling. I would have thought that an opportunity to improve would be welcome.
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Re: rear suspension

Postby hobot » Wed Dec 18, 2013 11:27 am

I love my sweet effortless handling of pure old stock parts Combat and have on a number of occassions kept up with the most expensive elite cyclers out for sane fun in some the world best Mt like hwys, but was working my ass off and gritting teeth in the turns to stay just below and suspress THE Hinge onset. Also every now and then would hit windy or lumpy road conditions not even trying to go fast that suddenly had me thinking I was too stupid to own a commando about to hurt or kill me before settled down in time. Maybe Cdo were surpreme handlers in the old days compared to the UJM and BSA/Triumphs but un-tammed Cdo's sweet as they are for sane thrills are a killer lurking that gets worse to add throttle or to cut throttle once THE Hinge hits. MacRae has 3 robust swash plates to keep up with the Seeleys and not vibe frame or pilot apart.
Throw yourself at the ground and miss!
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