Extended Swing Arm Shock and Spring Rate

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Steven31371

Steven31371

Joined
May 1, 2021
Messages
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I’m gunna put the Pierobon extended swingarm on my bike. It extends the Swingarm by about 35 mm. This will necessitate using a heavier spring rate on the rear shock.

The problem there is that I’m already using the heaviest spring that Ohlins makes for the stock shock that came on my bike, which is the Ohlins TTX36. Has the electronics package with the Evo 2 that I’d like to keep.

For those if you running an extended swingarm, what rear suspension setup are you using, and how much did you have to increase your spring rate in the rear?

Does anyone know an aftermarket spring supplier (not Ohlins) with the same spring length as the Ohlins spring for the Ohlins TTX36 but that has a higher spring rate than 115?

Is there a shock setup other than the factory installed Ohlins TTX36 that will allow the continued usage of the Dynamic Electronic Suspension? (Which I like our on the street)
 
KarlKani said:
No one on here has one, I have to be honest man this is really not needed for a street bike.
Click to expand...

Probably not, but, I like to over engineer the limits of the bike so when I push myself as much as I’m willing to I’m still way within the bikes limits, makes me feel better about being silly on the street, plus I still want the bike to be track capable for a session or two on track days.

Mostly it’s the extra stability, and because I have a 14/44 tooth final drive setup on my bike to compensate for my extra weight, a bit longer swingarm will mean less electronic intervention for anti-wheelie…I need anti-wheelie for now, I’m still a novice rider by your guys standards.
 
WyldCFH said:
You can try reaching out to klaus @ EPM Performance to see if HyperPro, or any of his other brands, makes a spring that would work. Home | EPM Performance
Click to expand...


Just spoke with him, thanks for the tip

He was saying that if the shock mounting position is the same on the new swingarm (and it is) that I probably want to go with a lighter spring not a heavier one, if accurate that would solve a few little problems for me.
 
Silliness should be refrained on the street or you’ll end up like Vicati.chasing tenths on the street will always lead to problems. A novice rider shouldn’t need an extended swingarm. These bikes are quite capable out of the box no matter how much whinging goes on here. Improve your skills first and then the bike will follow. Sounds like you need to get to the track and work w a coach. It’d be money better spent
 
rac1ngsnak3 said:
Silliness should be refrained on the street or you’ll end up like Vicati.chasing tenths on the street will always lead to problems. A novice rider shouldn’t need an extended swingarm. These bikes are quite capable out of the box no matter how much whinging goes on here. Improve your skills first and then the bike will follow. Sounds like you need to get to the track and work w a coach. It’d be money better spent
Click to expand...

One step ahead of you.

Also, ‘silly ness’ is subjective, I suspect that my version of ‘silly’ while going on some fun runs on the bike is substantially less silly that most here lol

I’m 50 years old haha
 
Then we have class A dumb ..... like you that just bust in on tech threads like this that you have no business even chiming in on.

rac1ngsnak3 said:
Silliness should be refrained on the street or you’ll end up like Vicati.chasing tenths on the street will always lead to problems. A novice rider shouldn’t need an extended swingarm. These bikes are quite capable out of the box no matter how much whinging goes on here. Improve your skills first and then the bike will follow. Sounds like you need to get to the track and work w a coach. It’d be money better spent
Click to expand...
 
These bikes waggle, buck , weave under hard acceleration and braking. You simply cant take the animal out of this cage and tame it.
 
Steven31371 said:
Just spoke with him, thanks for the tip

He was saying that if the shock mounting position is the same on the new swingarm (and it is) that I probably want to go with a lighter spring not a heavier one, if accurate that would solve a few little problems for me.
Click to expand...

This is wrong!

Lengthening the swingarm would mean the contact patch has more leverage about the pivot and on the spring. This means that there will be more swingarm movement (sweep angle) if the spring is unchanged.

To maintain swingarm behavior you’ll definitely want a heavier spring.


Sent from my iPhone using Tapatalk
 
Personally, I like the Course swing arm (made by Pierobon) vs the modded stock unit. They make the V2 in different flex configurations, not sure if that is also the case for the V4.
 

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Those look nice.

But don’t Pierobon modify the factory arm?


Sent from my iPhone using Tapatalk
 
endodoc said:
Personally, I like the Course swing arm (made by Pierobon) vs the modded stock unit. They make the V2 in different flex configurations, not sure if that is also the case for the V4.
Click to expand...
That swingarm is a piece of art.
 
endodoc said:
Personally, I like the Course swing arm (made by Pierobon) vs the modded stock unit. They make the V2 in different flex configurations, not sure if that is also the case for the V4.
Click to expand...

They do make the V4 one in different flex configurations. SBU talked about it in one if their videos. Apparently, their most flexible arm is only suitable for 10k miles before it's structurally compromised. They went with the stiffer, longer lasting one since that's kinda retarded to spend that much money on a part that won't last long.
 
Alkhater said:
This is wrong!

Lengthening the swingarm would mean the contact patch has more leverage about the pivot and on the spring. This means that there will be more swingarm movement (sweep angle) if the spring is unchanged.

To maintain swingarm behavior you’ll definitely want a heavier spring.


Sent from my iPhone using Tapatalk
Click to expand...


THAT makes sense to me…I’m looking for heavier springs that will fit the shock.
 
endodoc said:
Personally, I like the Course swing arm (made by Pierobon) vs the modded stock unit. They make the V2 in different flex configurations, not sure if that is also the case for the V4.
Click to expand...

I didnt see the Corse version for the V4….looking at the job they do on the factory one I like what I see, looks like they are using a CNC welder and they brace it well.
 

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