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FS570 Road Suspension Setup & Mods

RVJ

Joined May 2014
89 Posts | 25+
Auckland, New Zealand
Hey Crew,

A little bit of random info for you all, (especially SuMo 570 riders). Not hugely informative (yet) but it may help out another FS rider.

I went to a cool suspension seminar with Dave Moss in the weekend, (Feel The Track | Ensure your bike geometry, spring rates, hydraulic damping and tire size/compounds are in sync - he’s pretty well respected in little ol’ NZ).

Suspension tuning has always annoyed me as it’s such a subjective topic (I guess because it’s a personal thing), but since it’s free to adjust, I hoped to learn how to apply some science to my bike, in a practical way, to help customise and improve the bike.

The first hour tutorial was really good, and we covered off the basics while Dave demonstrated in practice how each setting effects the ride/performance. In the second part of the session we worked on our bikes, adjusting each bike to an “ideal benchmark” for the suspension, then making customisations.

Given I was the only ‘tard rider there, I had a lot of different questions. For me, I have a standard FS570, with Bridgestone S20 60’s. I also have the front forks dropped about 17mm up-front. It rides well, but my biggest complaint on the tarmac is that I wanted to help reduce “skittish” or “light” rear wheel hopping on uneven tarmac surfaces. I also wanted dampen the front without causing lack of feedback, which sometimes feels like it results in unsafe rebound in the front. It also felt out of balance a little, softer up front…

I weigh about 66kg and was surprised to hear that the default rear spring is too soft to achieve what I want. Basically the spring is too geared towards enduro (duh!) This makes perfect sense, but guess I never thought I’d need to replace the spring for road use. Effectively the tuning I had done (and had done) to my rebound and compression and preload on the rear to control the undesirable movement I was getting in corners meant that the suspension wasn’t functioning within the correct/beneficial range of motion of the shock – it was also resulting too little riding SAG to be effective

I’m going to get a new spring installed and will let you know how I go. I also will post my suspension settings to see if you like them, too.

Be keen to know if anyone else has changed out the rear spring on their FS570, and what impact it’s had on street riding? (I never take my FS off-road)

I’m still recovering from a broken arm (bloody dirt bikes), so it might be a week or so before I can get the shock out, but will keep you posted.

Cheers!
 
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Hey.

I must be the only guy that has this problem, either way here's a quick update :p

I removed the rear shock and took it to (Matt Watson Racing) for a new spring, explaining the info I’d been advised, (previous post).

Turns out the stock spring was actually very firm, and the recommendation was not to go heavier. The advice (based on a lot of experience of this issue and similar) was to re-valve.

As a result, low speed shims were added and the lower clamp shim removed. The logic being that I can then extend out the riding SAG back to 100mm (standard default for the PDS) and re-test from there. The additional low speed shims will reduce excessive rebound issues, leaving the full range of motion intact but increasing dampening (slowing rebound) on the outside limits.

FYI – to fellow Kiwi’s and Jafa’s Matt is awesome to deal with. He was happy to discuss in great detail his approach and theory, it was nice to meet someone who didn’t want to rush me out the door.

My arm is still pretty broken, but can’t wait to go for a ride. Pretty sure I’ll need to visit Matt again for some further tweeks - but looking forward to it.

More to follow...
 

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I actually think the front end is too harsh for me, granted I'm coming off a ktm 500exc with full ohlins matched to my weight. The rear is definitely two soft for me. Once i brought the fs570 home, I had to do some tweeks myself. After about a month of twiddling, I've come to the conclusion that the rear is not gonna work for me. I've broken down and bought a new ohlins ttx mk2 for the rear. The front responds much better after softening them up a bit. I've also pulled the forks up 5mm.
 
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Cheers for the post. Good to know! Yeah, I dropped my front shocks when I got my 570 too; I prefer the feel. I might have to re-think that after riding with these new rear updates, but hopefully the dampening won't affect the geometry too much. Its all good fun finding the "perfect" settings... I'll post my settings once I'm back on the bike... :spin:
 
Hey Guys. Update to the most unread thread ever :p

Back on the bike after 12 weeks of bone repair...

Rear suspension is noticeably better. The re-valved rear shock rebound has allowed for a greater riding SAG (80mm of movement) while still providing greater stability through corners and undulations. The front is moving a fair bit now in comparison, but still happy with using the clickers for now, but thinking that the same work is due up front given how much better the rear is reacting.

Anyway. For you guys that are riding SuMo on the road it's some food-for-thought; a pretty cheap improvement to handling over the stock setup. Noticeably better for $200 NZ Pesos.

Cheers.
 
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Hey RVbro.... Nice thread. Learning step by step gives you a much better understanding of how it all works together. Keep up thegoodwork.
Hope that arm doesn't give you too much trouble in the future mate. At least its not the throttle hand aye!
 
Cheers BergBro. Damn lucky it was the left arm, but it'll be a while before I go trail riding again...
 
Hey Rainerio, wasn't on the berg at the time... was on my KX450 death machine.... just a bit of bad luck, a dry very summer, and not enough skill! :spin:
 

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