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Thread: RXV Suspension Setup

  1. #1
    apriliaforum expert Britt's Avatar
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    RXV Suspension Setup

    My RXV has always felt under-sprung for my weight. I am 230 lbs without gear.

    I got hold of a set of Aprilia RXV heavy fork springs.
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    They came with longer spacers.
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    I filled the tubes with 10W oil with a 90mm air gap. The old oil was dark black and smelled like sewage so I was glad to replace it.

    Out back I installed a MXV 5,4 spring.
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    Now for a couple of questions from the group.

    What static sag should I start with? I'm not racing - just want a good, controlled ride.

    I plan to set all adjusters to their defaults as shown in the manual - unless anyone can suggest a better starting point?

    Can anyone point me to a source for a spanner for the rear shock? I see AF1 has one but it says the shock needs to come out to turn it...
    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

  2. #2
    apriliaforum expert levisik's Avatar
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    In supermoto its all about preference to find between performance and comfort. Move your butt 5cm bach and forward on a seat abd sag will change...

    Install oring on your front fork and observe travel of suspension.
    Make dumping stiff enough so forks wont go all way on jumps or hard braking. Rebound set to fork bo babk once without additional bouncd but let it do as fast as possible.

    Rear ia a different story. Usuaky riders set rebount to work slow, and dumping mid-soft on slow pressure and mid-high for fast movment...

    Generally it is all your preference.

    Seen 2 good riders about the same weight and both had totally different settings...
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  3. #3
    apriliaforum expert O Trader's Avatar
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    Check out this handy dandy calculator :

    https://www.teknikmotorsport.com/com...a/rxv450/2008/

    I set my 550 to 30mm and 106mm.

    This is some additional info :

    https://www.teknikmotorsport.com/Mot...DIY-Tips-Setup

    Im not as heavy as you but I am more than a hypothetical 75kg 5' 4' Italian rider and I went way past a 5.4 spring on the rear.
    Last edited by O Trader; 02-14-2019 at 08:17 AM.
    Cheers


  4. #4
    apriliaforum expert 10pointjames's Avatar
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    Quote Originally Posted by O Trader View Post
    Check out this handy dandy calculator :

    https://www.teknikmotorsport.com/com...a/rxv450/2008/

    I set my 550 to 30mm and 106mm.

    This is some additional info :

    https://www.teknikmotorsport.com/Mot...DIY-Tips-Setup

    Im not as heavy as you but I am more than a hypothetical 75kg 5' 4' Italian rider and I went way past a 5.4 spring on the rear.
    I believe I had a 6.0 rear spring on mine when I was racing it on roadcourse. it still squatted the rear pretty far on high speed sweeping corners
    [

  5. #5
    apriliaforum expert O Trader's Avatar
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    I think I ended up with a 6.8 or a 7.2 on the rear. I will have to find my receipt to make sure though.
    Cheers


  6. #6
    apriliaforum expert levisik's Avatar
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    Omg, I have ohlins 6.5 and it is hard as hell...

    It is better to put not that hard spring and do revalving.
    I think if you don't weight more than 220lbs, 6.0-6.3 is max you need.
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  7. #7
    apriliaforum expert Britt's Avatar
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    Thanks everyone, that gives me some stuff to think about.

    I'm very far from a racer so I don't want to get too extreme with anything. For general riding I just wanted a bit more support for my weight because I sure felt the bike sag when I climbed on board. I didn't do any before and after measurements and maybe I should have...
    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

  8. #8
    apriliaforum expert O Trader's Avatar
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    Quote Originally Posted by levisik View Post
    Omg, I have ohlins 6.5 and it is hard as hell...

    It is better to put not that hard spring and do revalving.
    I think if you don't weight more than 220lbs, 6.0-6.3 is max you need.
    Smooth bitumen, race track right through to natural terrain its all relative and user dependant.
    Cheers


  9. #9
    apriliaforum expert Britt's Avatar
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    So now that the snow is gone I'm riding the bike for the first few times with the new springs. The bike is harder to turn.

    Today I took the time to measure sag per: http://xvasylum.wikidot.com/guide:suspension-101

    Static Sag:
    F=29mm
    R=25mm

    Race Sag:
    F=61mm
    R=107mm

    The webpage above mentions race sag for enduro should be 105mm. I'm sure the race sag front/rear difference is why it's harder to turn thanks to the change in front rake.

    So maybe my front sag is too little for enduro. I don't race, I only want suspension that is balanced. I have SXV wheels that I swap on and off and most of my miles realistically are on the street but I want good feel offroad.

    The front springs came with longer spacers and I wonder if I should change them back to the OEM spacers and leave the "heavy" springs in. My rear spring preload is maxed out so nothing more I can do there without another spring.

    Advice?
    Last edited by Britt; 03-23-2019 at 04:12 PM.
    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

  10. #10
    apriliaforum expert levisik's Avatar
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    in short words. When you have harder springs, your bike i a little bit higher. Add to this that it is not diving as much during braking. Those, your general wheelbase distance is bigger, which makes bike to turn not as good as before.

    Additionally, suspension setup (compression/rebound) is also important - maybe you don't have a proper setting, and this cause your bad feelings about turning...

    If you can make a video:

    - you seat on a bike, with riding position. Second person is holding tail, to keep bike in vertical position. Third person stands in front of bike, grabs steering bar, and uses force to compress front suspension, and release it just after full compression is made. You need to check how far forks are going and how fast rebound is working...

    - rear you can test pretty yourself. You should be able to compress rear using hand and body weight only to 50% and rebound for rear should be generally slower than for front...

    Make a video and post it

    and you can always change tripple clamps for those with better offset
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  11. #11
    apriliaforum expert Britt's Avatar
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    Thanks for the suggestions. After much trial and error I've found my stronger rear spring is just too soft and is squatting too much under my weight (230 lbs without gear). I used the Race Tech calculator and ordered a 6.4 kg spring to match the upgraded front springs.

    Click image for larger version. 

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    Race Tech calls for rear shock nitrogen pressure of 165 psi. I have not found the spec for what the RXV would have come with from the factory, nor do I have the ability to check it. Does anyone have input on this before I look for a shop that can set it at 165 psi for me?
    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

  12. #12
    apriliaforum expert levisik's Avatar
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    usually rear shocks are set to 160-175 psi, I don't think, that RXV shock will any different value
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  13. #13
    apriliaforum expert Britt's Avatar
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    I hate replacing fork seals. Even more so considering I replaced the springs a few months ago, making this the 2nd time I'm inside these forks lately. I just want to ride this thing!

    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

  14. #14
    apriliaforum expert levisik's Avatar
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    have you checked free play on forks, to see if bushes needs replacement as well ? how are your forks working with new springs. Are you able to set them correctly without revalving ?
    2006 Aprilia SXV 450
    Tuneboy Cable available in Poland

  15. #15
    apriliaforum expert Britt's Avatar
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    Quote Originally Posted by levisik View Post
    have you checked free play on forks, to see if bushes needs replacement as well ? how are your forks working with new springs. Are you able to set them correctly without revalving ?
    Bushings looked healthy to me and they have 5K miles on them. I did not feel any play but I may not know what to check. They seemed okay to me as an amateur.

    Now that I have the 6.4 rear spring installed and the forks are not leaking I took a 20 minute ride and it feels much more balanced. Steering is neutral, where I was fighting it in turns with the 5.4 rear spring. I need to measure and adjust rear sag still but have not had much time to play with it. This is my first crack at suspension changes and I'm learning the hard way as I go.

    (BTW, I'll be selling the MXV 5.4 spring soon if anyone can use it).
    2009 Aprilia RXV 450
    2014 Yamaha Super Tenere ES
    Previous Aprilia's: 2002 Caponord : 2001 Falco

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