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Re: Carbonda fm936 Thoughts
Sorry to see that... It must be saddening.
I would buy some UD carbon cloth and epoxy resin.
And wrap this unfortunate hit with them.

They will probably sell you a rear triangle if asked politely.
But I didn't ear they had a crash replacement policy, but who knows, you can and ask saying we are many here and it would give us some relief  8)

$440 shipped for a new rear triangle. Not bad.

But, I already have the carbon sheet and resin. Wing recommends repair as it is not a high stress area of the frame.

I have a similar puncture in my Flyxii top tube that I never fixed…might do them both at the same time.

June 16, 2021, 08:19:23 AM
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Re: Carbonda fm936 Thoughts
0 psi?

0psi did the trick.

I’m now thinking the compression tune on my SidLuxe isn’t ideal for this frame. I looked up a few frames that use the SidLuxe in a similar position and I’m running a higher PSI to get the sag I prefer.

I’ll likely send the shock out for a tune this winter.

June 24, 2021, 08:13:44 AM
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Re: Carbonda fm936 Thoughts
Thanks, I have read a lot of the thread, and wasn't sure what the final conclusion was on max stroke.

It really seems that there are too many shock options from Fox and Rockshox, and then you add in tunes ... just too many to choose from.

It was said at least that a 40/42.5/45 fox are the same, just with different sag markings and spacers. I'd probably go 165x40, but just unsure of all the models and then the tunes. And if paying say $480 for the DPS performance, and then sending to fox for a tune, that really starts to get up there in price. So maybe the RS Nude off the Scott is closer, but then I see the SID with more adjustments ... can more user adjustable settings overcome a factory tune which doesn't suit the bike/trails/rider?

Hopefully someone has done lots of research and can break it down for me in the the options are 1) Fox DPS XXXX tune, 2) RS nude, 3) x-fusion yyy sort of thing.

I have the SidLuxe 42.5 in a M M tune and will send it in to be converted to a H M tune. It needs to be High compression and Medium damping.

I have to run it at 280psi to get 20% sag. This high of a psi prevents the shock from getting all 42.5mm of stroke.

Just upgraded wheels and fork. Switched to a 120mm fork and no more pedal strikes.

May 31, 2022, 11:37:20 PM
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Re: Carbonda fm936 Thoughts
I have the same, how did you reach the conclusion it needs to be converted ?
Unless a warranty reason, Isn't it something you can do yourself ?

I did the leverage ratio calculation of 115mm of suspension divided by 42.5mm of shock stroke. This gives a ratio of 2.75. A value of 2.75 puts it in the high compression ratio category for most shocks.

The part is $18 but everyone is sold out. Sram has released the DIY documents.
https://www.probikesupply.com/products/rockshox-rear-shock-tune-assembly-compression-tune-configurations-sid-luxe-a1

https://www.sram.com/globalassets/document-hierarchy/tuning-manuals/rockshox-rear-shock-piston-tuning-guide.pdf




June 01, 2022, 10:29:34 AM
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Re: Carbonda fm936 Thoughts
Shifting issues. Transmission or frame/hanger?

Had my FM936 built up for a few months now, 500miles and enjoyed it for the most part aside from one, rather major grumble.

Since day one I've not been able to get the gears shifting correctly.

Transmission is 12speed XT (cassette, mech, shifter, chain, optislick inner cable that I then upgraded to the polymer, SP41 outer cable).Yes, cable routed correctly. It's always a little out and as 12speed sprockets and chains are so narrow a little out is almost intolerable. It alters during the ride, i.e 1-2-3 good a start of ride but then not good by the end (even if an easy ride so haven't hit it on a rock, etc). It alters depending on the suspension setting (have a nude shock with 3 settings). It alters during suspension compression. It's never quite right.

I wonder if the clutch on the mech is partially to blame for a number of reasons. Firstly, I know the clutch affects shifting, increasing friction at the shifter and think it alters, ever so slightly where the mech rests after a shift, which if true means that because of suspension movement and chain growth the clutch is constantly 'working' and so minutely affecting where the mech sits and given how minute adjustments affect shifting it must be having an impact.

But also wonder if the clutch is actually causing the hanger to bend - as I say when the suspension is compressing causing chain growth it's effectively pulling at the clutch, and so mech, and so mech hanger all the time - it must be having an impact - which is kind of confirmed that when I check the hanger alignment with the tool it's always ever so slight out - is it plausible? Maybe the hangers on these fm936 are a little soft?

I've serviced the clutch, and backed off the tension as much as I dare and it is better but I just dont like the fact I feel like I'm having to compromise on a nice bike!

Like the idea of 1x12 but just seems to sensitive or is it the hanger/frame? - bring back 2 x 10 I say  ;)

Any thoughts appreciated.

Derailleur hanger - you know this is the culprit when the shifting degrades in only the middle cogs. If it shifts fine at the ends of cassette, but skips or clunks or is reluctant to shift in the middle three cogs, then it’s likely your hanger.

If it happens all the time, in every gear, and is triggered by the suspension then it’s likely not the hanger. Start by disconnecting the shift cable and setting your limit with the cable disconnected. Go ride the street. There shouldn’t be any clunks or anything no matter what you try to do.

Then, screw the barrel adjust all the way in, back into two full turns. Connect the derailleur cable. Increase tension or decrease tension until you get a smooth shift from smallest cog to second smallest. Listen to the sound. Play with the tension until the noise from the chain is reduced.

Then, work up the cassette and check your upper limit.

If you still have problems then there is something wrong with your cable routing or derailleur or cassette.

August 13, 2022, 03:37:58 PM
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Re: Carbonda fm936 Thoughts
AFAIK 909 is UDH already...

Yes it is. Says it right on the spec page.


March 22, 2023, 06:59:32 PM
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Re: Carbonda fm936 Thoughts
Can you share any photos? I am probably going to buy a size L and try to sell my M. I think I will leave the shock with it, as it's all color matched at this point. I need to weight out here if the 120 rear with my 120 SID will be a better ride for my rocky, rough environment than keeping the travel at 42.5, or even 40.

Do you see any benefits of the 40mm or 42.5mm rears' travel? Or rather I should ask, is there a clear benefit to building with the new linkage. I am new to FS, so trying to make sense of it all. I had to really pump up my rear to 250 psi to make the L compression tune work for my trails, 23mm sag...

The Fuse is a relatively slack hard tail. What specific geometry measurement drove you to a M? Was it wheel base only?

I have ridden my hardtail a lot this spring and it is a size smaller than my 936. One thing my riding buddies noticed is that I take less risks on my hard tail. I take the B line a lot, navigating around obstacles or high consequence features.

The 936 wants to go straight. It begs you to feather the brakes and seek the apex at speeds you would never even consider on a hard tail. You want the longer wheel base to provide confidence in cornering. To provide the counter balance to your body getting really low and into the bike.

Get the Large.

May 24, 2023, 08:53:32 PM
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Re: Carbonda fm936 Thoughts Tried the High compression tune for 20miles. Switched to Low compression tune as mentioned by another in the thread. I like the Low tune. It lets me run a higher pressure and achieve a 30% sag.

I did send it out to a full time tuner, Trail Labs. They mentioned the IFP might have been setup wrong at the factory, preventing full travel.

I do get much closer to full travel at 225psi, I am 190lbs.

SidLuxe A1.

June 12, 2023, 03:39:02 PM
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Re: Carbonda fm936 Thoughts
And what exactly is the leverage ratio on the OG FM936? I’m assuming this is the original travel one. I run a L compression tune, it’s very active and mutes a lot of small bumps. I have to run a pretty high PSI though, I think 260 psi on a rockshox Deluxe.

Side question here, if the leverage ratio was more like 2:1, what rockshox tune would be appropriate? I’m trying to understand the benefit of running a medium, or a high compression tune.

Leverage ratio is 100/40, 2.5.

In my email exchange with Trail Labs, they mentioned the high PSI to achieve desired sag is correlated to the frame leverage ratio and shock design. Going 30-40psi over weight is normal, depending on frame.

When it came to the tune, my goal was increased plushness and achieving full stroke on big hits (3-4ft drops, g outs, and mistakes on rocky tech. If I’m racing, I notch up the rebound and pressure a bit.

June 13, 2023, 04:00:24 PM
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Re: Carbonda fm936 Thoughts Not sure if it would have helped but I use the Nukeproof down tube protector.

Here is the frame protection order I placed at Chain Reaction.

August 14, 2023, 08:59:00 PM
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