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bikes w/ split rebound/compression forks

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trevor saxe-coburg-gotha
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PostPosted: 09:28 - 12 Dec 2018    Post subject: bikes w/ split rebound/compression forks Reply with quote

H's new CB1000R has Showa Separate Function Big Piston forks (SFF-BP), with rebound and compression adjustment in the left leg, and preload in the right.

IIRC, one iteration of the MT09 also has this.

When I first heard about this on the 09 I assumed it was some sort of cost saving device. But then I heard that the '08 MV F4 used this type of fork construction - and was the first, or one of.

https://www.youtube.com/watch?v=IbZBS6CYzGo#t=11m28s

Have you owned one and if so what are the plus and minus points with such forks?
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Landy10
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PostPosted: 11:56 - 12 Dec 2018    Post subject: Reply with quote

https://www.kawasaki.ca/media/mig/2013/ninja-zx-6r/English/files/assets/downloads/page0012.pdf

Looks like its a weight saving, ease of adjustment thing
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MarJay
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PostPosted: 12:02 - 12 Dec 2018    Post subject: Reply with quote

I think your post has an error. Surely both forks have preload adjustment, with one working on compression and the other rebound?

I don't see the issue, if they work well it makes a lot of sense and makes it less likely to have the two legs adjusted differently as per a conventional adjustable fork.
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bacon
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PostPosted: 15:01 - 12 Dec 2018    Post subject: Reply with quote

Sort of correct with regards to MT09.

2013-2016 models
Both legs have springs and preload adjustment.
Right leg only has the damping cartridge, with adjustable rebound.
Left cartridge is a dummy cartridge, no damping.

2017+
Both legs have springs and preload adjustment
Left does compression
Right does rebound

I would expect any SFF setup to have something similar to the 2017 MT09 above.
Springs in both legs and therefor preload adjustment in both legs, then each leg having a separate damping function.
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stinkwheel
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PostPosted: 15:52 - 12 Dec 2018    Post subject: Reply with quote

The marazocchi forks on my MZ baghira had compression damping in one and rebound in the other. preload on both.

That was in 2002.
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G
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PostPosted: 22:54 - 12 Dec 2018    Post subject: Reply with quote

Marazocchi forks on the first generation RS250 (1994) had this.

It's pretty standard on most lighter push bike forks too, by the way - presumably both weight saving and simplicity on their smaller diameter forks.
Also means you only have to adjust one side.

The forks were just about okay in standard form on the road, but lacking on track. However, just a better spring may have fixed that.
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Pete.
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PostPosted: 23:03 - 12 Dec 2018    Post subject: Reply with quote

If the two forks are fixed together in a rigid enough assembly to prevent racking it really doesn't matter that one side is damped separate to the other, except in people's imagination.
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Monkeywrenche...
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PostPosted: 10:59 - 13 Dec 2018    Post subject: Reply with quote

Pete. wrote:
If the two forks are fixed together in a rigid enough assembly to prevent racking it really doesn't matter that one side is damped separate to the other, except in people's imagination.


This, the forks are always moving as a single unit when one stanchion slides in so does the other, damping one fork damps the entire assembly.
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trevor saxe-coburg-gotha
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PostPosted: 18:35 - 13 Dec 2018    Post subject: Reply with quote

You'd think it'd be more ubiquitous, really.
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G
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PostPosted: 19:15 - 13 Dec 2018    Post subject: Reply with quote

Oh, speedway bikes normally only have damping on one side - they have a single shock, then 'springs' are courtesy of some rubber bands (no really - sophistication is not their forte) on both sides.
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A100man
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PostPosted: 09:55 - 14 Dec 2018    Post subject: Reply with quote

Pete. wrote:
If the two forks are fixed together in a rigid enough assembly to prevent racking it really doesn't matter that one side is damped separate to the other, except in people's imagination.


'Ye can ni' break the laws of physics' - Montgomery Scott, Chief Engineering USS Enterprise
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RhynoCZ
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PostPosted: 13:20 - 14 Dec 2018    Post subject: Reply with quote

That's nothing to brag about, my GPz550 from 1988 had pneumatic suspension system, that you could pump up with a bicycle pump. Wink

Thinking of it, it was an awful system, that leaked air, so, yeah. Laughing
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