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Re: Carbonda fm936 Thoughts
Can anyone please confirm the headset specs for this frame? Is it upper IS42/28.6 lower IS47/33? Carbonda are being a little slow with replies.

Found this on page 12 of this thread:

Here's a 40 set that works for tapered headsets, 110 will have the same numbers:
Cane Creek 40.IS52 Bottom Headset - Lower Part 1.5 Inches - IS52/40
Cane Creek 40.IS42 Top Headset - Upper Part 1 1/8 Inches - IS42/28.6

Thank you. This is now a little confusing though. Carbonda's specs don't specify exact headset spec. I already have a 42/52 headset but the specs for the NS Synonym (same front triangle?) list FSA NO.42/47/ACB, which made me think I might need a 47 lower bearing assembly like this one https://www.bike-discount.de/en/buy/ritchey-comp-drop-in-headset-underpart-is47-33-691978. Hmm. Hoping one of the forum members who have already built one up will confirm which is it!

OK, I got the cheap headset from Carbonda with the frame (usually do this with China direct frames to have a reference) and just went out and made sure the bearings fit the frame and then measured them.

The specs that were posted on page 12 are correct:
IS52/40
IS42/28.6

April 09, 2020, 05:00:34 PM
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Re: Carbonda fm936 Thoughts
@ all who are running this frame in XL:

I'm using a 60mm stem and 740mm flatbar. Will the 1700mm brake hose be enough in length? Or better getting the 2000mm one?

Size L frame, 60mm stem, 780mm bars, 1700mm rear hose, lots of slack.  I was in a hurry to get the bike running and didn't cut anything, could probably trim 100-150mm easy
Thanks man!

@all
Are you running full housing inside the FM936 frame for rear derailleur?

You have to run full housing for rear der, brake & dropper.

July 23, 2020, 05:33:54 PM
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Re: Carbonda fm936 Thoughts
Looking at used forks for the frame I just ordered (medium). How long has everyone been cutting their steerer tube? Obviously this will vary with frame size and riser preference.
Thanks!

On my medium frame, I cut my steerer tube to 180mm. I am running an Ultimate USE 40mm stem which has a 45mm stack height I believe. Currenty I have two 10mm spacers below the stem with the topcap flush with the stem.

Was looking at a used fork cut to 6 3/8in. Sounds like that might be to short.

6 3/8" work perfect on my medium - running a kalloy uno stem on top of a 1/2" spacer right now.

Mine is currently cut a bit longer so I also have a 1/2" spacer on top of the stem.

August 21, 2020, 05:49:58 PM
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Re: Carbonda fm936 Thoughts
Anyone ordered a BSA model and received it recently?
I did order about 15 pages on this thread ago :o , and still no sign of production.

Just go with the press-fit setup.  Remember, Loctite is your best friend, bearings aren't too expensive, and if all else fails, turn the volume up on your earbuds to tune out the creaking.  ;D

(BB30 is junk, but I have made it work without creaking over the past 6 years with Loctite and annual bearing replacement/servicing...)

Yep, I've had no issues with PF30 or PF92 on any bikes so far - this is over the last 4 years.   FM936 has been silent for 350 miles so far just using a SRAM BB.

BB30 on the other hand is complete garbage IMO.  >:(

August 25, 2020, 01:21:49 PM
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Re: Carbonda fm936 Thoughts
...I would order 3-4 additional hangers.
Does anyone have a link to a hanger that works for this frame?

The picture are quite blurred. Is it just paint scratches or it is bent ?
Did you check the frame around that area for a crack ?

Carbonda can provide you with a hanger, the shipping is cheap for such small item.

Before I was buying 2 hangers for each frames I did build.
And have a collection now as none of the riders needed it.
By experience it is useless, one is enough.
Maybe two if you are particularly unlucky.

Chasing a shifting issue. Only the two middle cogs struggle to shift down the cassette, very sluggish like the chain isn't picking up the ramps. I have been monkeying with the barrel adjuster for a few days. The encyclopedia of bike issues says this is a text book bent derailleur hanger...

Will replace and find out.

Even new hangers can be a bit out of spec and new 11/12 speed drivetrains really require a lot tighter tolerance on hanger straightness.

All home builders should invest in a hanger alignment tool, mine has paid for itself many times over already.

In fact I just had to straighten the hanger on my FM936 this past weekend after a spill and the shifting went to crap.  It looked straight to the eye, but was off quite a bit.

September 02, 2020, 05:19:37 PM
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Re: Carbonda fm936 Thoughts Update on the lower pivot movement:

Msg'd Adam and he said to cut the pivot axle down to 80mm.  I pulled it apart and measured it at 82.5mm, so I filed it down to 81mm, cleaned everything up and reassembled and the play is completely gone now.  I think I'll leave it at 81mm for now.

Also checked out the bearings in the process and they are still very smooth.

September 29, 2020, 08:50:33 AM
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Re: Carbonda fm936 Thoughts
Hello, how do you communicate with Carbonda?
Their website does not work today, I wrote a letter to info@carbonda on Sunday and did not receive an answer, but today I tried to write to sales1@carbonda and adam@carbonda by email, both letters returned with an error "554 Reject by content spam"

I really want to buy this frame, but I have difficulties in communication :)

I've had the best luck using their skype link.  Of course, I have to wait a bit for replies because of the time difference.

September 30, 2020, 06:07:44 AM
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Re: Carbonda fm936 Thoughts
The low BB is the thing that stands out the most to me out of the geometry of this frame. I guess it all depends on the type of trails you ride. On my home trails (natural desert trails, loads of rocks and off-camber technical singletrack...nothing is groomed), pedal strikes are far more than the two other bikes I ride most frequently (2017 Cannondale Scalpel and a Titus Fireline with a 120mm fork...neither is known for a particularly high BB) and that's with 170mm crank arms. Love this frame, but I dare not run the 936 with a 100mm fork where I ride seeing how low it is with 120mm.

Agreed on the BB here.  I originally had a 100mm stepcast on mine and the BB was ridiculously low and I was having strikes every ride even with 170mm cranks - hard strikes.

Swapped the fork to a 120mm stepcast just because of the strikes and that cleared up 90% of those for me.  As an added bonus I feel like the bike actually steers and handles better now as well.  As info: 100mm was 44 offset and the 120mm is 51 offset.

October 20, 2020, 08:41:43 PM
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Re: Carbonda fm936 Thoughts
After a lost package and a bunch of delivery delays I've finally been able to start building ;D While pulling through the rear brake hose and derailleur housing I had a look at the NS bike and noticed that they guide their housing below the rear shock lower bolt like in the red line in the picture. Ive think most of fm936 builds guide the housing above the mounting bolt (like the green line) but would there be any issues doing it like on the NS? it looks like it would be more protected but at the same time more rubbing against the frame.

I liked the way it looked better how NS runs the cables under, but in the end I went over because that sharp bend caused extra drag on the derailleur cable I could feel.   No issue with that for the brake line, but it would look funny with one under and one over.

If I was using AXS though I'd run the brake cable under for the cleaner look.    :)

October 23, 2020, 08:02:21 AM
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Re: Carbonda fm936 Thoughts
My advice would be to forgo the reach and stack to match your current bikes and just set the seat based on the larger size. Others have fallen into the trap you are leaning toward and it hasn’t worked out. You want to be in this bike: long, low, and slack. Matching the reach and stack isn’t critical important on a MTB. You move and constantly adjust your body based on several factors. You want to be low in this bike, not high on it. ;)

and I'm guessing his saddle pushed back far behind the BB is the result of the older, shorter geometry - very bad.


Behind the BB over the rear wheel is inefficient for pedaling and traction - look at the saddle position of the most efficient pedalers in cycling (hint they do TT).



 

November 05, 2020, 06:10:52 PM
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