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Re: Carbonda fm936 Thoughts Hi,

my fm936 SL M, with RS Revelation RC SA 130mm , RS Sidluxe Ultimate 165*42.5, SLX, BrandX Ascent 150mm, wtb st light i25+bontrager xr3 2.40+2.20, carbon matte+dyedbro. Weight 12.6kg.
March 04, 2021, 02:22:59 AM 		1
Re: Carbonda FM909
Quote from: Julian on December 11, 2021, 08:15:42 AM
As requested by PM, here some linkage analysis.

If anyone has a vector diagram of this frame, I can provide more accurate results :)

Hi Julian, take a look at attached vector PDF. Is it enough? I can export it to CAD format (DXF or DWG) if needed.

EDIT: According to my "CAD analyze" 165x45 damper leaves about 1mm clearance between seat stays and seat tube, but I didn't take into account the flexibility of rear triangle, so 45mm travel is very risky. Besides it is only the drawing.
December 11, 2021, 02:56:05 PM 		1
Re: Carbonda fm936 Thoughts
I found the steering way too slow/sloppy with a 120mm fork and any stem length longer than 60mm, but that is to be expected with a 66 HTA.

IMO a 50mm stem is probably about the sweet spot for that HTA.


August 24, 2022, 11:20:50 AM 		1
Re: Carbonda fm936 Thoughts Wanted to say thank you to all who contributed to this thread as it was invaluable in the first FS build for me. Have only ridden FM936 few times but it feels night and day against my aluminum HT. It did end up half a kilo heavier than expected, but 11.2kg with pedals, power meter, bottle and garmin mounts for size XL seems competitive weight for 3.8k euro. Very glad to have found this forum. Hope everyone has a great summer on their bikes.

 
June 26, 2023, 01:01:49 AM 		1
Re: Carbonda fm936 Thoughts
Quote from: sandwich on December 11, 2023, 05:27:49 PM
What that translates to roughly is more suspension resistance to your pedal stroke- in my opinion the S3 will be a much better climber and sprinter and the 936 will be mediocre in all scenarios.  Not a bad ride but not a standout.

Am I missing something? Isn't more suspension resistance what you want in a cross country frame? Especially when climbing and sprinting? And why the add the extra weight and complexity of a 4 bar suspension to XC? I'm very confused by this analysis and recommendation.
December 11, 2023, 07:13:23 PM 		1
Re: Carbonda fm936 Thoughts
Quote from: sandwich on December 11, 2023, 09:22:33 PM
You add the extra pivot for stiffness, reliability, better braking performance, and switching the suspension from single pivot to virtual pivot.  You can tune the horst link to do a lot of things, and the added anti-squat is pretty helpful in my opinion.  If you are looking at it from a pure XC point of view, yeah I'd probably go with the carbonda and a lockout shock, then slap that on any time you head upwards.  If you're looking for a trailbike to go have fun on, then I'd go with the S3 as the marginal improvement of the horst link with roughly the same weight and cost seems like a win to me.

None of this is to say the 936 is a bad frame- it's probably the best designed chinese full suspension bike I have ever seen.  The NS got rave reviews and this is basically that bike.  I just think the addition of the horst link and in particular its added anti-squat makes it a better buy.

This isn't an enduro bike, you are not going to experience pedal kickback at 100 or 120mm of rear travel. An additional pivot point isn't not going to add stiffness either, in fact it will do the opposite. Tune the horst link how? and why? Again, this isn't an enduro bike, it is an XC frame that has been built by a lot of people as a downcountry frame. As soon as you enter trail territory then, yes, go 4 bar and tune your shock all day long. The S3 is a weird frame in the modern bike realm, no major brand is using 4 bar for XC or light trail for many reasons, and if light trail is what you want then sure go for that.

I ride an over-forked 936 (120/100 Float DPS), and an over-forked 1001 (150/135 Float X), and have built and ridden a 130/120 (Float DPS) 1001. The 936 is so mush more stable while pedaling, and has no issue using the full travel when needed, and climbs like a rocket when compared to even the 130/120 1001.

Independent of your analysis, I have always been confused about locking out for climbing (unless its a hard pack fire road). Suspension will help keep the tire in contact with the surface so that you aren't just bouncing around...
December 11, 2023, 09:38:03 PM 		1