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Ice-Tech 6-bolt disc brakes 160mm Found these, maybe someone needs something like that:
https://a.aliexpress.com/_BSHglX


July 27, 2020, 12:21:30 AM
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Re: Carbonda fm936 Thoughts
You guys are going to convince me to spend a lot of money here...

I'm looking to build a bike to compliment my Chiner carbon ultralight XC hardtail I built using this site in 2014.  This looks like an interesting option. I want something that climbs really well, but can handle the downhills better.  This lightweight hardtail is slowly killing me...  ;)

I worry about the very non-traditional geometry on this frame.  Its a stark departure from my current frame (CS-218) and even more radical than the new Specialized Epic-EVO.  Geometry comparison below (used NS data since the frames are very similar/identical)

Given I ride a LARGE CS-218, should I consider a MED. or LAR. FM936?  That reach on the FM936 really worries me...
I learned here from David Arthur that you should get your normal size. The frame is for short stems only. The reach seems long, but as the seat angle is very steep you won't have such a long reach in real life. Just check eff. top tube. Also Carbonda recommends a seatpost without setback on this frame.

July 29, 2020, 11:50:58 AM
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Re: ZTTO MTB M1 Boost hubs 28H 54T Ratchet
What are your guys go-to for straight pull spokes?  I just ordered these ZTTO hubs but haven't built straight pull before.  I originally was going to go with Sapim Lasers, but now I'm reading horror stories about non-bladed spokes straight pull spokes, at least when needed to service them they just spin and it takes a ton of clamping force to hold the round spoke.
There is something to it. Using round spokes, especially Lasers can be very troublesome. Three very important things you have to comply. Use linseed oil for nippels, destress spokes and Always overturn a spoke and make a quarter turn back. Best is to use bladed spokes like I'll do for this project. You can hold them way better

July 29, 2020, 03:52:21 PM
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Re: Carbonda fm936 Thoughts
Carbon or Aluminium rims?

Carbon
Then it's quite obvious this happened. With an electrically conducive medium like tubeless milk (electrolyte) there is a electrochemical corrosion going on. The Aluminum has a lower valence than the carbon so there is a constant ions transport from aluminum to carbon. Ths makes the aluminum corrode. It really dissolves. This can even lead to a complete nipple head failure and the ripping apart of nipple head and rest of nipple. This also happens with water, but it takes longer as water is faster evaporating like the persistent milk.
ALWAYS use brass nipples when buildung carbon rims you want to run tubeless and you want to ride your bike also in wet weather conditions. Salt from the winter times, even help the corrosion.
The avaiation learned it the hard way, as they were placing aluminum ribs on bare carbon. Nw they are using a insolation layer between the both like glassfiber.

July 31, 2020, 08:02:47 AM
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Re: Carbonda fm936 Thoughts
I read that people thread a tiny steel bolt into the nipple and then use a magnet to pull them into the holes.  Seems like a PITA.

This is exactly what I'm doing and it's working well as long as you have a strong magnet. You need to remove the valve stem to insert the nipples in the rim but you would have to do that also if you were to remove the tape to change a nipple so it's no big deal.

July 31, 2020, 12:03:06 PM
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Re: Carbonda fm936 Thoughts XL SL frame came in at 2,012g. Everything was removed except for the cable liners.

Here are the weights of the attached items.

I will consider a RWC Shock Eye Needle Bearing Kit

Frame, shock, and all frame bits is 2,329g.

July 31, 2020, 02:12:09 PM
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Re: Carbonda fm936 Thoughts
...how good/bad in the pedal bob under power?
This is definitely a worry for us hardtails guys  ;)

August 06, 2020, 12:08:32 PM
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Re: Carbonda fm936 Thoughts

Thank you! I am glad I went with this color. Carbonda is amazing, I will look out for more from them in the future.

Build is pretty finished now!

Looks great.  I'm interested to hear your impressions on the ride.  In particular, how does it climb and how good/bad in the pedal bob under power?

I can comment on it after almost 3000km on it and recently biked in the Alpes.
Using a rs deluxe 165x42.5 shock with 30% sag and 80+kg geared up.
There is some visible moving while biking, but not noticable while biking offroad. On tarmac I sometimes use the paddlestand when hammering...but not sure it really helps..
 On steep and technical climbing without lockout without a doubt, more traction and controll, love the active suspension...like to sit while climbing btw.
Hopefully this helps you.


August 06, 2020, 02:43:05 PM
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Mechanical pull disc brakes list - 140/160mm - road bikes Cable operated hydraulic:

Juin tech - R1 (post mount)
- two calipers, 160mm disc = $130
- two piston
- made in Taiwan
- forged/CNC AL
- 160mm only (?)
- 154g/ea

Juin tech - F1 (flat mount)
Juin tech - M1 (side mtn mount)


PRO A8000
- two calipers, 140mm disc, pads = $55
- two piston ("double sided synchronous drive")
- CNC machine AL, one Ti screw
- heatsink style brake pads
- floating disk rotors
- 140mm only (rear 70mm front 35mm spacing) some reviewers complain because they thought it would work on 160mm..
- 140g/ea

ZTTO (same as the PRO A8000, just different pads)
- two calipers, 140mm disc, pads = $51
- 270g/both
ZRACE BR-002 (same as above again)


XOOM XTECH HB100
- two calipers, 120/140/160mm disc = $50
- two piston
- no brake pad included (?)
- 190g/ea
Reviews here:
https://singletrackworld.com/forum/topic/any-experiences-with-the-zoom-xtech-hb-100-brakes-too-cheap/ (positive)
https://www.youtube.com/watch?v=aIEzwkr80fA (negative)
https://forums.mtbr.com/components/hydro-caliper-cable-actuated-advise-1090865.html (negative, leaks oil after a month or so)


Giant Conduct system
- requires special stem
- hard to find, not sure if its still sold


Cable only:
Avid BB7
- two calipers, 160mm disc, pads = $55
- single piston (?)
- easy adjustment mechanism
- 210g/ea

TEKTRO MD-C550
- two calipers, pads ~$100
- two piston
- 140/160mm capable
- 170g/ea

TRP SPYRE FM
- $170

Two piston seems common, anything one piston or pure mechanical seems not worth it. Four piston is available (Juin GT-F) but incredibly expensive.

So far I'm happy with ZTTO gear:
- SPD pedals last a year already (they use bushings not ball bearings, so not so surprising)
- BBs work well
- Cassettes have some flaws apparently

But reliability here is more important, if piston leaks, brakes can fail to operate.

August 07, 2020, 03:16:04 PM
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Re: Carbonda fm936 Thoughts

Looks great.  I'm interested to hear your impressions on the ride.  In particular, how does it climb and how good/bad in the pedal bob under power?

...how good/bad in the pedal bob under power?
This is definitely a worry for us hardtails guys  ;)


Okay after a few rides with the rear sag just below 25% with low rebound. Here are my impressions.

Me: 175lb 5'10
Bike: Trail oriented build, Just under 26lb, Medium SL frame

Feels very planted and fast on flow trails. It handles small rock feilds so well you can stay focused on the next turn. The light weight and 29in wheels carries momentum up hill easily. I almost crash on the low angle ups by taking turns too fast. I have zero pedal bob when sitting. Minor pedal bob happens doing powerful standing up climbs but, it is far from an annoyance.

On more technical trails with big rocks everywhere the bike gets push around a bit. The slack front really helps and doesn't have any pedal bob ever (unlike the stumpjumper new evo I tried). I specifically noticed the amazing slack front on very steep and rocky areas. The set back stance makes me feel very secure and gives me the confidence to navigate techinical areas with speed. While this bike isn't as equipped for downhill as some of the higher travel trail bikes I have tried(Pivot 429 comes to mind), it is super fun and capable.

This is an amazing bike for anyone trying to get a more capable XC bike with solid trail performance. I don't see any downsides to the modern geometry. For me in Colorado, this bike will make an excellent jack of all trades

August 11, 2020, 01:55:24 PM
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