Will this modification work?

[Yeahoo Whoyah]

Some interesting angles for single shock rear swing arm, do you think it will work? http://www.ebay.com/itm/181625913804?_trksid=p2060778.m1438.l2648&ssPageName=STRK%3AMEBIDX%3AIT

[Kiwi_Roy]

To me it looks like it's well thought out, triangle bracing and designed to hide behind the frame tubes  ;-T

The bike has great lines
Very clever.

[pauldaytona]

The bracing is not what I would do, maybe the pipe is strong enough, the setup is a cantilever. As on the daytona/ v11. The dimensions make that the wheeltravel is transferred smaller to the shock. With the Daytona it is 2:1, so when wheel goes one inch up, the shock gets 1/2 inch, so for 4 inches travel the shock should do 2 inches. This is not progressive, so the shock should be made for that. Using a shock that was made for a link system what is progressive won't work.
How the dimensions works out on this one, you need to measure. 

I see they cut the tonti too, to lift the rear?

[jcctx]

Looks like a $1500 parts bike to me!!!

[LowRyter]

looks pretty trick to me.  I don't know anything about shock and rear wheel movement geometries and ratios but it look like whoever did it, knew what they were doing.

[Kent in Upstate NY]

He needs to work on his grammar.

[ken farr]

engine position seems elevated.....

However, it does make a nice presentation.

kjf

[Steph]

Don't know how it rides but the guy has taste and building skills

[rocker59]

It's been done.  Very famously on the Zagato bike, which was featured in a Davida advertisment:  http://www.bikeexif.com/zagato-guzzi






Ed@Guzzipower has the swingarms available:



http://guzzipower.com/store/SAbrace.html

[Idontwantapickle]

I don't think I'd ride that ebay bike. Look at the difference between Ed's swingarm and that one. It is just not braced properly.
Hunter

[Kiwi_Roy]

Ed's looks over-braced to me but I'm no mechanical engineer  ???

[dilligaf]

YW posted: Some interesting angles for single shock rear swing arm, do you think it will work?   ::)
Who cares? It's all about looking cool, doesn't have to work.

Looks like a $1500 parts bike to me!!!

 :+1  About all that SP is good for now.  ::(  :BEER:
Matt

[blackcat]

Ed's looks over-braced to me but I'm no mechanical engineer  ???

I thought Ed is an engineer.

[LowRyter]

I don't think I'd ride that ebay bike. Look at the difference between Ed's swingarm and that one. It is just not braced properly.
Hunter

You're right,  there's no zip tie of the other one.


 :D

[NCAmother]

if you google "guzzi mono shock conversion" you'll find plenty of other examples.  Ed's swingarm would save a lot of headaches, there around $800.  I've talked to him on messages, he seems like a pretty good guy with a good track record for performance.  I think there is one on eBay right now.

[Turin]

I'd be a little bit more nervous about the geometry of the chassis and how it effects the steering/handling.

[Shorty]

Why include the artsy phartsy "photo shoot" picture?   :D

[Steph]

Why include the artsy phartsy "photo shoot" picture?   :D

Marketing, marketing.
I'm afraid the the days of red suspenders targeting are over ;D

[andrewdonald1]

I think it look great!  If it rides great.. perfect.

[nc43bsa]

He lost me when he described the Guzzi engine as transverse.

[Chuck in Indiana]

I thought Ed is an engineer.

Yeah, he's an ME.

[lucky phil]

looks pretty trick to me.  I don't know anything about shock and rear wheel movement geometries and ratios but it look like whoever did it, knew what they were doing.

God I love these kind of posts.......it basically reads, I have no idea about the engineering but I can tell the builder really knows what he's doing.
If you don't know about the engineering then you aren't in a position to judge the competence of the builder.
That and the fact that the engineering devil is in the detail and there isn't enought detail to take a definitive position.
I can however say that the rear suspension design seems on the face of it to be weighed more towards the look than the dynamics. Not saying it would structurally fail but good engineering wasn't the prime consideration here.
Form has also won out over function in the exhaust department as well I fear and if good engineering is aligned with good grammar then it's going to be dangerous.
Ciao

[lucky phil]

Ed's looks over-braced to me but I'm no mechanical engineer  ???

It probably is considering it only has wheezy old 2 valve Guzzi power and a 140 section rear tyre to contend with.
You could probably brace it with saucepan handless and it would be fine.
Ciao

[Chuck in Indiana]

That and the fact that the engineering devil is in the detail and there isn't enought detail to take a definitive position.

True.

It probably is considering it only has wheezy old 2 valve Guzzi power and a 140 section rear tyre to contend with.
You could probably brace it with saucepan handless and it would be fine.

 ;D I know you're being facetious, but the old 2 valve "can" make some pretty serious power. If you look at the spineys, Guzzi used some pretty heavy tubing on the monoshock. There's a fair amount of stress there.

[pressureangle]

It's pretty unless your eye includes good engineering. The rear shock mount will inevitably fail if this thing is rode hard for a while. It's not braced near enough to the top. Ed's swingarm shows how it needs to be. The ratio of the shock or progressive qualities aren't significant, as long as the shock is built by a competent manufacturer that can model the suspension correctly.

Maybe the high rear end takes into consideration that the shock mount will migrate back as the tower bends over.

[kevdog3019]

Looks strange to me but since I'm no ME I can't venture a guess on how effectively it works.


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[lucky phil]

True.
 ;D I know you're being facetious, but the old 2 valve "can" make some pretty serious power. If you look at the spineys, Guzzi used some pretty heavy tubing on the monoshock. There's a fair amount of stress there.

Chuck, I also spend a fair amount of time in the "latest and greatest"world of motorcycles and here 200+ hp from a V twin is "serious" power. The bar just keeps rising I'm afraid and in this world an air cooled 1100cc V twin that makes somewhere around 85hp is sedate. Hell it was pretty sedate when it was new.
As for the heavy tubing on the rear arm, well that's more to do with Guzzi making everything massively overweight and not about any high stresses there.
Even comparing my Ducati ST2 with the V11 sport of the same era you can easily see how fat and overweight the Guzzi is and the only reasons there are for that is the design is crude and it's just in Guzzi DNA to build things with little regard to keepng the weight down.
Massive cranks, massive flywheels, heavy bevel box, none of it is necessary. Guzzi just don't have any regard for saving weight.
The ST2 is a scalpel compaired to the V11, so you can imagine what it's like compaired to an 1198.
Strangely the V11 is still my favourite out of all my bikes, but then again I'm a bit strange as well.
Ciao

[Chuck in Indiana]

The ST2 is a scalpel compaired to the V11, so you can imagine what it's like compaired to an 1198.
Strangely the V11 is still my favourite out of all my bikes, but then again I'm a bit strange as well.
Ciao

You see, we're more alike then different.  ;D My last duck was an ST2, and my favorite bike is the Mighty Scura. Go figure..
Strange? Yeah. Make that Hell yeah.. ;)