swing-arm - options ?

markQLD said:
and i've asked Sean, at Metmachex, for some details of the 2013 swing-arm they are now making.
Click to expand...

Sean's reply ;
"Ok that makes sense, it was probably spondon that made that one for Roger.
Ill probably design 2 swingarms, with eccentrics and slots.
Yes I have no problem in you telling people about us making some.
Not sure on the price yet but around ?650.00 I think.
I will let you know more when I have it and some pictures for your forum."
 
breganzane said:
...  I based my comments on Tom's description of the Spondon ally arm ......  He said the left side limited it to a 140 tyre.  Your experience appears to differ.
Click to expand...
maybe a bloke should re-check Clyde's wheel alignment eh !    :-\
 
looks to have been a couple of versions of the alloy swing-arm,  just small variations.
Clyde's is more like the bottom pic, but doesn't have the brace that drops down half way along the arm.
got these pics from Roger today;
laverda20swingarm.jpg

if i had the options,  reckon the steel tube version is the go.  mite swap ya an alloy one?  nar then again,,  mite not  :-\
laverda20swingarm202.jpg
 
Rolling%20LSR.JPG

and here is the other alloy version from Windy Corner (unbraced)
and the SFC1K original (not aftermarket but for comparison)
DSCF0144.JPG
 
A little bit of a Spondon update:

Further to the increased investment, we can also announce today the acquisition of the shares that Norton did not already own in Spondon Engineering Ltd. This gives Norton 100% control and ownership of the renowned 40 year old motorcycle engineering business, we wish retiring founder and partner Stuart Tiller a great retirement and hope he can find some decent fishing to get his rod bent into while he enjoys some relaxed time? The purchase of Spondon gives Norton increased manufacturing ability with it?s skilled workforce and extra capacity. This investment goes further along the route to increase British made components in house and so keep control of supply chain.

From
http://www.nortonmotorcycles.com/news/norton-delivers-british-export-growth/

Cheers
Jason

 
markQLD said:
Sean's reply ;
"Ok that makes sense, it was probably spondon that made that one for Roger.
Ill probably design 2 swingarms, with eccentrics and slots.
Yes I have no problem in you telling people about us making some.
Not sure on the price yet but around ?650.00 I think.
I will let you know more when I have it and some pictures for your forum."
Click to expand...

Hi Mark

Thanks for doing the leg work. I want a swingarm to fit my 79 1200' to accept at least a 4 inch rim and a wider tire. I prefer something with a decent looking brace, and eccentrics. Would also be nice if it would accept stock chain guard ( I want to use Boba's carbin fibre chain guard that uses stock mounting).

My PayPal account is standing by to order!

Paul LeClair
 
I found this drawing lurking in my files. Shows the standard Laverda 180 disk brake swinger with some wheel and chain elements overlaid. You can see that the outline of a 150 tyre just misses the chain but interferes with the left side of the swingarm.

The four tyre profiles shown are 120, 130, 140 and 150.

Saving the drawing as a jpg file loses a lot of detail. If anyone wants a clearer one, I can email it as a pdf. The pdf version is around 300 KB, which exceeds the 200 KB limit to post here.

Cam
 

Attachments

  • swing arm (disk brake) with tyre & chain.jpg
    swing arm (disk brake) with tyre & chain.jpg
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Interesting Cam, see that the total internal width of S/Arm is 238mm, Motodd is 234mm and the standard rear wheel set-up bolted straight in.
As for chain clearance, a 150 tyre on the Motodd left about 3mm clearance, that was on a 3.5" rim.
 
Cam, I have a 150 tyre on the standard (but braced for monoshock) 180 swingarm on POP.
I only had to removed the torque arm mount bracket on the frame, and cut a notch out of the chainguard, but the 180 swingarm width accommodates a 150 tyre. I have a few mm either side freeplay.
I also have a 150 on the Corsa but that swingarm is wider anyway. I have seen a 160 on a Corsa swingarm.
 
it is not only about the width of the tire, it is how much it is pulled in by a to narrow rim that makes it fit...  ;) That said, a 160 tyre can be everything between 151mm and 169mm wide - even with the RIGHT rim...

It's not so much about the number stamped on the side-wall, it is about the real width.

looking at the drawing (thanks for that!!), I wonder why they did not weld the long tubes more to the outer side of the swing-arm-spindle-tube (right word?!?). with the same width at the rear, that would give more room for tires... But then, they did never intend to have wider tires, right? ::)
 
On my 180 I had to change the swingingarm to one off an RGS (easy to do)  because at 154mm the Avon tyre I wanted to use was a bit too tight for my liking.  I think the RGS arm looks pretty strong- certainly compared to the fairly weedy looking 180 job and are cheap.
 
I think I got the tyre dimensions for that drawing out of a tyre catalogue so they may not be universal for all makes of tyres. It was a few years ago when I drew it and I forget the details, but I presume the manufacturer's info would be based on recommended rim sizes for each of the tyres. A skinnier rim will pull a fat tyre in a bit, so I'm not surprised that you can make a 150 tyre fit. I can't see the point in doing it though because a pinched-in tyre will have a "chicken strip" band of tread at the edge that is practically unuseable on a road bike.
 
Mine was a 150/70, and not all 150/70s are the same total width. You have to check the manufacturer's specifications for that.
Both Corsa and POP rears are on a 3.5 inch GSXR 750 rear wheel, which helps keep overall width down (compared to the GSXR 11 4 incher)
 
the total internal width of S/Arm is 238mm, Motodd is 234mm and the standard rear wheel set-up bolted straight in
Click to expand...

Hi Rob - You forgot the standard swinger's chain adjusters - about 2mm thick per side! - Regards - Phil
 
Laverdalothar said:
looking at the drawing (thanks for that!!), I wonder why they did not weld the long tubes more to the outer side of the swing-arm-spindle-tube (right word?!?). with the same width at the rear, that would give more room for tires... But then, they did never intend to have wider tires, right? ::)
Click to expand...

The swingarm tubes are angled in at the front to clear the frame downtubes behind the swingarm pivot.
 
Hi Cam, could you send me that PDF file of the swinger dimensions robberyman at iinet dot net dot au
Spacings on the gixxer wheel are a mind fuck!!

Thanks mate
Rob
 
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