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Re: Carbonda fm936 Thoughts
Quote from: Roby13 on November 05, 2020, 01:07:35 AM
Hi guys,

I found thist threat yeasterday and I I read the whole thing because I want to order this same frame, thanks for all that cool information :).
My only thought is ,wich frame size would fit me better.? Comparing the geometry with my actual Scalpel Si in L, the carbonda frame is pretty big so I'm considering downsizing to M. What you guys think?
I am 1,83m tall and I usually have my saddle height at 77,5 cm (BB to top of the Saddle).
Anyone riding a M with more or less the same saddle height?

Thanks again and keep posting those cool bike pics!

Hi,

The reach is longer but the seat tube is steeper.
What you need to look at is the distance between saddle and handlebar (horizontaly and verticaly) to have a nice riding position.
I am 1,78m with 75cm BB to top of the saddle. With a L size and a 40mm stem (what i like to ride), I have the same horizontaly and verticaly position as my Orbea Alma size L with 60mm stem.

The main difference is that on steep uphill, with the Orbea Alma, I was seated "on the rear wheel". What means poor handling and struggling to keep the front wheel on the ground.
Conclusion : I suggest you take the Carbonda L size.
November 05, 2020, 03:12:21 AM 		3
Re: Carbonda fm936 Thoughts
Quote from: Roby13 on November 05, 2020, 08:53:27 AM
I want to keep my actual position on the new frame which I find perfect,  it would not be a problem even if the seat tube is 4 cm shorter, I just need to set my saddle 10 mm backwards.
The thing is, that this frame in M has a 30 mm longer reach than my Scalpel in L which is perfect if I want to build it with a shorter Stem
but in L it is 55mm longer .

As i mentioned, don't look at the reach alone. Consider distance saddle / handlebar !
Going from 73,5° STA to 76° STA (for example) make the saddle 31mm closer to the bars => you need a reach 31mm longer to have the same pedaling position (horizontal distance saddle / bars)
If you take a 55mm reach longer, then you can reduce 25mm from the stem length (better downhill and handling)

For example, as i said on my Orbea Alma, I have 63mm reach difference, compensated buy 31mm with STA and 20-30mm stem length.
Look at the picture => same position saddle / handlebar.
November 05, 2020, 01:07:58 PM 		2
Re: Carbonda fm936 Thoughts When i center the pictures on the rear bike axle, you can see that the geometry, wheelbase, angles, BB height etc. are very very different.
But saddle->handlebar length is the same => same "pedaling" position



The FM936 is a modern geometry, it should be riding hard, with short stem. Take a size L and downsize your stem  ;D
November 05, 2020, 01:15:07 PM 		3
Re: Carbonda fm936 Thoughts
Quote from: Roby13 on November 06, 2020, 01:55:10 AM
Here is Patxi Cia's bike, a Spanish xc racer which is built with the same approach (xc/xcm aggressive riding). He is shorter (1'75 mtrs) and rides a S size.

A 9'8kg rocket

Hahaha !  :o A "downcountry" bike downsized with a 120mm stem ? I think it is the worst idea for both handling and power.
As acedeuce802 said : The slack HTA, steep STA, long reach, and long wheelbase all play together.

If you play around with that, it will be shitty for sure. Long stem with slack HTA is a terrible idea for downhill handling.
As well as saddle set up backward is a bad idea for uphill.

Back 10 years ago, every body were riding 650mm handlebar. On modern geo 29" bikes, nobody would do that.
You are entering the future of xc geo, do not be afraid, forgot your old bike geometry and take a L you won't regret it  ;D

PS : spanish people are not tall. A L in Spain is a M in France and S in Denmark   :-X
November 06, 2020, 02:45:47 AM 		5
Re: Carbonda fm936 Thoughts
Quote from: Roby13 on November 06, 2020, 04:13:31 AM
Did you ever tried a longer stem on a bike with slack angle? because IMO there is a lot of bro science about geos, most important thing on a bike which needs to climb efficient (anybike at some point) is the saddle position, if you shift your saddle forward you are going to have less weight on the rear wheel and also less traction.

Stem
Yes i did try different stems on my 65° HTA bike. When stem is longer than 60mm this is a very strange sensation et poor handling.

STA
I have a custom geo hardtail 76° STA / 65 HTA / 476 reach and a 73,5° STA / 69 HTA / 428 reach hardtail Orbea Alma. The Orbea Alma offers better traction on flat tracks but less traction on steep climbs, because the weight is too much backward. The best traction is offered when the saddle is verticaly aligned with the rear axle or a bit forward. On my Orbea Alma i feel like my weight is backward the axle (i am not sure if i am clear :) ). PS : the vertical and horizontal length between saddle and bars is exactly the same between all my bikes. The difference doesn't come from the positionning.

XCO/XCM or downcountry ?
I understand your need. You are trying to get the "best of both worlds". Downsizing and "modifying" a downcountry geo to fit XCO/XCM geometry (old or not) is probably a bad idea in my opinion (suspension feel with your ass at 73° instead of 77°, handling with longer stem...).

The reviews don't recommend the NS Synonym for its pedaling quality. If you are into XCO/XCM you will certainly find it lacks pure pedaling performance (vs Scott Spark and Orbea Oiz for example) and moreover you will not have the benefits of the downcountry geo because downsized + long stem. Instead of "the best of both worlds", maybe it will results in "the worst of both worlds".

My need is a mini enduro bike with the weight of a XC.
Your need is a pure XC that descends better.
Maybe you are right and you need a M with longer stem and saddle backward... let's give it a try if you are not afraid of being disappointed. I hope you'll enjoy it  ;D
November 06, 2020, 07:47:34 AM 		4
Re: Carbonda fm936 Thoughts It is clear that they changed the front triangle A LOT : 67° seat angle and 77° head angle  ;D
November 11, 2020, 12:59:40 PM 		2
Re: Carbonda fm936 Thoughts Hi, here is my table of weight and price.
I would like to buy a 165x40 (or 42,5) SIDLuxe with remote, but I can't find it for sale... Or a DT Swiss 535 (all mountain) with "2 in 1" remote.
The bike will be around 11kg
November 18, 2020, 02:13:23 AM 		3
Re: Carbonda fm936 Thoughts Are you sure 387g for both front and rear brakes ?
November 18, 2020, 07:10:07 AM 		1
Re: Carbonda fm936 Thoughts You might also consider adding :
  • Stem spacer
  • expander / star
  • rim tape (30g / wheel)
  • sealant (50mL / wheel is not enough i guess)

 :-X
November 18, 2020, 07:28:54 AM 		1
Re: Carbonda fm936 Thoughts
Quote from: Pharaohollie on November 19, 2020, 01:46:26 AM
A question for those who've built up the bike with SID 35 Ultimate/Select: any issues with knocking due to loose bushings or damper leaking oil? I am about to pull the trigger on one but reports of bad QC are scaring me a little.

On French forum, a lot of people reported such problems on the first SID 35 released. They send their forks for after sale service, Rockshox changed the bushing and problem solved.
I don't know if Rockshox solved it on first mount.
November 19, 2020, 02:20:32 AM 		3