Chinertown
Chinese Carbon MTB => 29er => Topic started by: tinecelmare on April 01, 2021, 05:40:47 PM
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I hate buzzwords, but it's what I'm looking for. Ideally 120mm frame for a lightweight build as this will be a dedicated high mountain bike for long climbs. However I want to be able to descend the roughest terrain (but of course not at the speed of a true enduro bike). Planning on running a Fox 34 Stepcast in 120mm. Would like 66* HA.
Something in the realm of a Transition Spur or Santa Cruz Tallboy. I've been eying the Carbonda fm936, but I just don't trust the single pivot design for the rugged downhills - it just seems too fragile of a system.
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Love my FM936. How much do you weigh?
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I'm 155lbs. Also important are the rocky and rooted out 2-3 mile downhills that many people shuttle to the top and come down on enduro bikes.
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I'm 10lbs heavier and the superlight FM936 has held up well for me.
Did a race in NC with similar characteristics as you mentioned, 8 mile climb in the middle plus to more extended climbs, some rough longer downhill, the last - Mid Black was really eroded out and I was a bit outside my comfort zone there (particularly with my brakes fading by that point), but the dropper & slack geo kept me upright.
The enduro guys killed me on a couple of the gnarlier descents, but having a 22lb bike on the climbs meant I was long gone before they got there. ;-)
The Transition Spur is a single pivot frame as well right, but with a little more travel?
If I was buying now I'd probably opt for the FM909, mainly because I could go large and still get a 125-150 dropper in it. The seat tube on the FM936 was a bit too long for me to go large. 2 water bottle mounts in the front triangle would be a plus for me as well.
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the transit spur has exactly the same single-pivot suspension as the fm936 ;)
and yes, fm936 is a great frame
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I'm 10lbs heavier and the superlight FM936 has held up well for me.
Did a race in NC with similar characteristics as you mentioned, 8 mile climb in the middle plus to more extended climbs, some rough longer downhill, the last - Mid Black was really eroded out and I was a bit outside my comfort zone there (particularly with my brakes fading by that point), but the dropper & slack geo kept me upright.
The enduro guys killed me on a couple of the gnarlier descents, but having a 22lb bike on the climbs meant I was long gone before they got there. ;-)
The Transition Spur is a single pivot frame as well right, but with a little more travel?
If I was buying now I'd probably opt for the FM909, mainly because I could go large and still get a 125-150 dropper in it. The seat tube on the FM936 was a bit too long for me to go large. 2 water bottle mounts in the front triangle would be a plus for me as well.
Are you talking about Pisgah area in NC?
Good point on the single pivot Spur - I didn't realize that! I looked at the FM909 but wanted a 120mm frame - 936 seems to allow.
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Yes, Pisgah area of NC. My East Coast MTB mecca :-)
This bike with a 120mm works really well in that area for all but the nastiest descents and that's probably more on me than the bike.
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Would the FM936 work for heavy riders? Or is it more for leaner guys?
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Would the FM936 work for heavy riders? Or is it more for leaner guys?
I'm 205 on a 936 and have no complaints. My build is 24.5 pounds and I really enjoy it. Handles the roots, rock gardens and short steeps in my area really well. I'll put it to the test this summer in the Rockies to get a better idea of how it handles the longer steep stuff.
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I'm 70kg and have no issues with it. It's not a full 130mm trail bike, but it's not designed to be that, although it is very capable! I'm grateful for it's sub 12kg weight on the long climbs for sure!
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I thought the FM936 would only accept a 165X42.5 shock which is 115 mm of travel?
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I thought the FM936 would only accept a 165X42.5 shock which is 115 mm of travel?
Surveying the thread says that some users are OK with 42.5 and it rubs for others at bottom out. From what I recall x40 and the imperial x38 are more common/reliable/recommended by the manufacturer
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i'm building two winow FS030. It is designed for the 120mm travel you asked for. Waiting on the frames to arrive. http://www.winowsports.com/product/XC-Full-suspension-mtb-frame-FS030.html
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Love my FM936
(https://previews.dropbox.com/p/thumb/ABKTqceK2wqDRwCTtLR4MiEdCr__j1DVKYGlE1BHr21d0MAXiWisraHqDLWVNYWyAK-zbFoBZso4Yx7SoiyKryGspS4XB5FLRpN91NHG9wUSWfdLpHE_tyabTWX9w1zUyPUzfH-rbS8aIniriek3fMHgQv1it_GVeBs5JmAqcQ93MKilGyv6F1CaKO9NQ9LpGTywU1ikgmBKGkZah_FDR8UF02AhdNvC3Rfz9kev3HXBJy3B22542anw8uNyX7m0TVeSzPOcjqM87x857dlZCMlMgG9RqauyflTphBOxJKAxDF1yC7UCAR-jxElxWHZBQSUXK6DuaekO0SwKALFh5pVGZpzN34P8aT3YNvRQjyD87w/p.jpeg?fv_content=true&size_mode=5)
This is with the 165x42,5 shock which 'only' gives 107mm of rear travel (not 115mm - since it is impossible with a 2.5 travel ratio). For me it fits a 200mm dropper for the steeps. No problems so far.
I'm 91kg/200lb and 191cm/6'3"
If you need more descending capability I would also take a look at Carbondas FM1001. It'll cost you 350-400g more but it does give a 65.5deg HA and that rear triangle pivot.
Its rare to find a rear triangle pivot on downcountry focused bikes. Even the Transition Spur you mention doesnt have one - i'm pretty sure its fine without if engineered correctly (which the FM936 seems to be)
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Love my FM936
(https://previews.dropbox.com/p/thumb/ABKTqceK2wqDRwCTtLR4MiEdCr__j1DVKYGlE1BHr21d0MAXiWisraHqDLWVNYWyAK-zbFoBZso4Yx7SoiyKryGspS4XB5FLRpN91NHG9wUSWfdLpHE_tyabTWX9w1zUyPUzfH-rbS8aIniriek3fMHgQv1it_GVeBs5JmAqcQ93MKilGyv6F1CaKO9NQ9LpGTywU1ikgmBKGkZah_FDR8UF02AhdNvC3Rfz9kev3HXBJy3B22542anw8uNyX7m0TVeSzPOcjqM87x857dlZCMlMgG9RqauyflTphBOxJKAxDF1yC7UCAR-jxElxWHZBQSUXK6DuaekO0SwKALFh5pVGZpzN34P8aT3YNvRQjyD87w/p.jpeg?fv_content=true&size_mode=5)
This is with the 165x42,5 shock which 'only' gives 107mm of rear travel (not 115mm - since it is impossible with a 2.5 travel ratio). For me it fits a 200mm dropper for the steeps. No problems so far.
I'm 91kg/200lb and 191cm/6'3"
If you need more descending capability I would also take a look at Carbondas FM1001. It'll cost you 350-400g more but it does give a 65.5deg HA and that rear triangle pivot.
Its rare to find a rear triangle pivot on downcountry focused bikes. Even the Transition Spur you mention doesnt have one - i'm pretty sure its fine without if engineered correctly (which the FM936 seems to be)
So which is it? Does the FM936 gets 107mm or 115mm travel in rear for a 42.5 shock? I'm reading both.
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The Workswell WCB-M-364 would be the best choice imo, a rear triangle pivot, 120mm rear and 130mm front, a 65.8° HA, and pretty light because it shares all the frame but the rear triangle with the 363 that is their new XC-bike.
https://www.workswellbikes.com/FULL%20SUSPENSION/wcb-m-364.html
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The Workswell WCB-M-364 would be the best choice imo, a rear triangle pivot, 120mm rear and 130mm front, a 65.8° HA, and pretty light because it shares all the frame but the rear triangle with the 363 that is their new XC-bike.
https://www.workswellbikes.com/FULL%20SUSPENSION/wcb-m-364.html
I like that one too, I contacted Workswell in early march, but they couldn't tell me anything yet about the frame, so I guess it still takes some months till it's available.
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Hi,
Why not use the FM1001? It can be built up with 120mm rear travel and 120/130mm Fork... Slightly heavier than the FM936 but not much 200g on a medium, unless you take the 936 Super Light then it's 360g
Cheers
Guy
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Hi,
Why not use the FM1001? It can be built up with 120mm rear travel and 120/130mm Fork... Slightly heavier than the FM936 but not much 200g on a medium, unless you take the 936 Super Light then it's 360g
Cheers
Guy
That is true. I asked Carbonda if I could put a 130mm fork without dropping the BB height much and he said yes but then he suggested I could do a 10mm spacer bottom headset as well. Putting a 120mm fork may drop it too much? Need a good light weight fork. New for 2022 is the Ohlins RXF34 m.2 mountain bike fork which is interesting. There are a select other forks around the 1600 or 1700g weight. Not sure lighter ones in the 130/140mm travel range.
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Hey,
i calculated a change in fork length. On FM1001 120mm the BB drop is 35mm (341mm height), which is still pretty high.
Transition spur 120mm is 336mm (40mm BB drop).
My Titanium softail (http://chinertown.com/index.php/topic,3224.0.html) (160mm fork) is 333mm height (43mm BB drop) and has no problem of pedal hit on the group. Kona ESD is 314mm for instance.
But the seat tube angle of FM1001 120mm will be very steep at 79°
If you climb ultra steep hills, it will be helpful, but if you also ride flat trails, it will be awful.
(https://i.ibb.co/fqHLF6B/Sans-titre.png)
Why don't you build a custom titanium bike ? ;D
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better quality geo table :
(https://i.ibb.co/nwdZw1S/Sans-titre.png)
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better quality geo table :
(https://i.ibb.co/nwdZw1S/Sans-titre.png)
Just to confirm…that calculation is based on 120mm shock and 120mm fork? If so, that’s not bad.
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120mm shock = doesn't impact geo chart
120mm fork as written yes
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well let me just say Winow FS030 is not recommended as durable. Did this last night on a 2' drop at speed.