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Topics - FullCarbonAlchemist

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Fat Bikes / Modern geometry 27.5 fat bike frame
« on: December 16, 2023, 07:50:37 PM »
Looking for something that could compete with the Fezzari King’s Peak, which has a 75deg seat tube, 67deg head tube, 27.5x4.5 clearance and internal dropper post compatibility. Those numbers don’t sound very “modern” by 2024 MTB standards but a hardtail fat bike needs middle of the road geometry for snow riding anyway.

I  want something more playful than my Framed Alaskan Carbon (V1/26”) which with a rigid fork has a 69 HA/73 STA. Add a suspension fork and that seat tube is really leaning back. Reach is hilariously short and this results in funky, tanky handling.

I’m not aware of any unbranded 27.5 fat frames other than the ICAN SN05 and that doesn’t have updated geometry (68 HA, 73 STA, 433mm reach in size Large).

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I’m looking to make my gravel bike more upright and because it employs an unusual steerer tube size (GT Grade V1 1.25” taper, versus more common 1” straight or 1.5” taper steerers) I haven’t been able to find forks that could let me run a longer steerer tube. This leaves the stem and bars as the only way to reduce the bending over that my bad back can’t handle. I barely ride it anymore and end up setting off a back crisis at least half the time, keeping me stuck in bed for weeks.

I already use a 70mm/10 degree Thomson riser stem and am ordering some inexpensive higher rise short stems to see how that works for me. The main thing I want to change is the bars: currently 46cm Salsa Cowbell Deluxe with mild flare and fairly normal drop.

What I’m hoping for is some rise, mild flare, and short drop to reduce the bending angle I ride at. But there are so many gravel bars on Ali…only a few with rise and so far none that I can find with short drop.

Any suggestions? Alloy and carbon are both fine.

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Component Deals & Selection / 27.5 fat bike rims - carbon or alloy
« on: September 18, 2022, 02:08:21 AM »
I want to change my fat bike to 27.5 for this winter and just need to select some rims.

So far I’ve had a surprising amount of trouble finding good options…many are sold as compete wheels with terrible cheap hubs that won’t last a month under snow riding torque.

These are basically all I’ve found for carbon, $329/rim plus $50 shipping:

https://a.aliexpress.com/_EQ167DV

Most of the other options are SunRingle Mulefuts that I don’t particularly want; closed rims are a much better tubeless solution for intense riding in deep cold than ones with cutouts. I’m open to alloy on paper but most alloy fat bike rims have cutouts. And don’t even get me started on HED fat bike rims that I’d probably break in a few weeks. They’re designed for very light, very gentle riders and I am neither.

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29er / FM1001 - 150 or 160 fork?
« on: September 14, 2022, 03:54:40 AM »
This is a frequent topic of discussion in other threads and I’m thinking about building up 1-3 FM1001 frames for my family in the next year (as well as one for myself eventually if I’m lucky; I already own a 1002 and am planning to build a 1003 this winter).

I usually over-fork my bikes by 10mm compared to how they are sold stock (and I like a nice upright cockpit about level with my saddle), but I’m learning that the FM1000 series doesn’t necessarily need that. They’re already well balanced bikes with fairly tall head tubes whereas in the past a lot of branded bikes were intentionally sold under-forked in their first year or two so the next year’s models could be “upgraded” with 10mm more fork travel.

Do you run your 1001 with 150 or 160 travel? I originally considered 160 for any size Large frames I built or more aggressive riders (like myself), but now that I’ve been thinking about lowering my FM1002 to 160mm — the idea of having anything but the tallest possible fork on any MTB would have been heresy to me in the past — I thought I’d poll 1001 owners and get everyone’s thoughts on this.

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29er / FM1002 - 160 or 170mm fork?
« on: September 14, 2022, 03:46:17 AM »
I’ve been running my FM1002 with a 170mm fork since I built it up in the spring, and I know several others here are too. Who’s running it at 160? Has anyone tried both?

I’m about to swap forks on mine and the Fox 38 I want to put on is currently set to 160 (I also have a 170 air shaft for it) so I’ve been thinking about this a lot. I’m also thinking about building a FM1003 next so once I have that bike with a 180 fork, maybe keeping my AM bike at 170 is a little redundant.

This debate has come up a few times so I thought I’d make a thread specifically to discuss it: let’s hear your thoughts!

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Component Deals & Selection / 1.5” headsets?
« on: April 14, 2022, 02:56:55 PM »
A number of unbranded frames, notably from Flybike/Carbonda, come with relatively unusual headsets that are 1.5” on both the upper and lower bearings, and often have spacers in the upper bearing that create room for internal cable routing through the headset (even if you don’t get the optional cap with an opening for cables).

I own a Carbonda FM1002 and worry that aggressive enduro style riding/jumps will eventually bend or break that upper spacer. It would also be nice to have high quality bearings from a trusted brand and a lighter cap, as the Carbonda supplied headset cap looks like it was made from pig iron.

Can anyone suggest big brand and “China” brand options for replacements? I can’t seem to find much with a casual web search, partly because “1.5 inch headset” seems to be too generic a term and many tapered headsets come up. My preference would be for headsets that have a stronger/thicker upper bearing spacer than the Carbonda OEM, or fill the entire upper race with a larger bearing that needs no spacer.

Here’s one of the only examples I’ve found and I’m not 100% sure it’s compatible with the FM1001/1002 head tube….

https://us.ritcheylogic.com/us_en/bike/headsets/comp-cartridge-integrated-is-1.5-upper-headset

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E-Bike Frames & Builds / Gravel e-bikes?
« on: April 07, 2022, 07:08:08 PM »
I’ve had my eye on something similar to the GT eGrade Current (flat bar, 250w wheel motor and small 250wh battery in the relatively normal sized down tube) for a while, but would consider more of a normal crank type motor and large battery too.

Preference is for something that has good geometry for a flat bar, or an extremely upright drop bar setup; my spine has had it with my current gravel bike which is a fairly upright drop bar. Otherwise pretty standard modern gravel attributes: throughaxles, clearance for at least 42-45mm tires and preferably 50mm+, solid construction, and hopefully compatible with suspension forks like the Fox 32 AX or Rockshox Rudy. Though I’d probably do an initial build with an ordinary solid fork.

8
In the FM1002 thread a couple of us have been talking about possible replacements for the heavy, mediocre quality original 8x40 steel shock bolt and I decided to order a couple of BetterBolts 8x40 shock bolts that they normally sell as part of some of their Transition shock hardware kits.

As I hoped, they seem to fit great and the only difference in shape is a slight protrusion of one side, maybe 2mm further out of the rocker arm than the stock bolt. Not a problem.

All you have to do is email support@betterbolts.com to make the request for an individual bolt, and cost for each was about $15 USD.

9
Metal Frames / Hardcore hardtails
« on: January 05, 2022, 07:46:45 PM »
Hardcore hardtails with legit progressive geometry have been hard to find in the carbon category, from what I’ve read on those sections of the forum.

I was browsing AliExpress and noticed a store with several titanium models, some of which look quite progressive:

PYTITANS Official Store
https://a.aliexpress.com/_m0KeCPE

I assume we’d be hard pressed to find someone here who’s actually owned one, but figured they might be of interest to people looking for these kinds of frames.

They clearly market some of their products as analogues to branded bikes: two different hardcore hardtails are marketed as “Kona ST” and another is marketed as having the same geometry as a Linskey. That definitely earns an eyebrow raise, but doesn’t necessarily mean they aren’t legit.

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29er / Carbonda FM1001/1002 headset question
« on: December 28, 2021, 12:07:10 PM »
I’m placing an order for a 1002 and noticed that the included headset comes with what looks like a carbon plug instead of a regular star nut and top cap.

In my experience with Carbon steerer tubes, these can work themselves loose with hard riding and are a little heavy.

Can I just use a regular top cap and star nut with this headset or is the expanding plug required for some reason (I can’t imagine why)?

And while we’re at it, is there anything else I should know about this headset? The ~270-degree internal collar (with space for cables to be routed through even though I’m not getting the internal routing version and will just be using the head tube routing ports on the frame) is a little unusual…

11
29er / TopFire FM-M940
« on: December 22, 2021, 10:22:14 PM »
Haven’t seen much discussion about this one, and its description/geo is a bit confusing (does the chart indicate 160mm rear travel and a 180 fork? There’s no indication of adjustable travel). But it seems promising.

https://www.top-fire.com/29er-mtb-full-suspension-carbon-bike-frame-for-dh_p28.html

Before I decide to commit to the safe but slightly boring 4-bar option with the upside down shock (FM1002), one of the frames I could build with a 185x55 shock I already have (FM1001 or LCFS947 though I don’t love the looks of the latter), or roll the dice on a Haideli FS830 despite the issues with the 831….I thought this TopFire frame might be worth looking into more closely.

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Fat Bikes / DNM inverted fat bike fork — how does it compare?
« on: November 20, 2021, 04:47:47 AM »
I have persistent problems with my current Chinese carbon fat bike fork and its carbon plug loosening over the course of snow season due to the shearing forces of the snow pushing/twisting on the fork. So I’d like to get something with an alloy steerer….which is unusual for affordable carbon solid forks.

So I’m looking at suspension forks, and I don’t want another Bluto. Found my last one (now dead with a shattered integrated lower bushing) pretty underwhelming, particularly in the cold. Mastodon Pro EXTs are basically nonexistent AFAIK. Which brings me to the inverted option.

There’s Wren with an improved damper, cold tolerant replacement damper option, and keyed stanchions for stiffness since there’s no arch. I also happen to know Kevin Wren through social media but wouldn’t ask for a discount in these crazy times. A very similar but cheaper version of the same fork body is sold by DNM.

Anyone have experience with either the Wren or DNM versions or both? I’ve heard the DNM is halfway decent but would like more first hand experience. Can’t find many reviews online.

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