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matt walker and his prototype session setup
Video Contents
0:00 - Intro, Build Overview & Size
1:22 - Adjustable Pivot Location and Progression
3:04 - Tire Choice, Pressures, Inserts
3:47 - Suspension Settings, Bars, Tinkering
6:00 - Maven Brake Power and Unique Lever Position
7:45 - Seat Height, Testing Philosophy
8:52 - Tuned Mass Damper
Part of hope brake I really like, it is still messy to bleed any brakes, and rug with mmm drop of dot is not uncommon for any bleed process, at least from my experience
I have it in combination with a dorado (not the carbon one) so in theory a super heavy front end.
The first two runs I felt it being a bit heavier, but after that you‘re used to it.
But honestly there has never been a moment where I felt like it‘s too heavy to do whatever, the bike is like 19 kg+ so that‘s heavy as a whole.
It‘s rather extreme that, if I take the Tmd off now, the bike actually feels terrible in comparison and I‘m wondering how I could ride it before😅
Another Atherton Gearbox bike in the wild
When can we accept that sizing is a choice and a preference.
Just because he’s a certain height doesn’t mean he should be forced to follow the size chart.
If you prefer a shorter frame thats great for you, and vice versa, but the under breath criticism of anyone that chooses otherwise is tired.
The frame with the logo does not have a seatstay bridge. I wonder if this removable bridge feature would make it to production? I always thought that, customizable flexibility to a frame would be the next thing that companies begin to market since the innovation pool is beginning to seemingly dry up.
Both frames have the feature on the lug to allow the plate to attach
100%
And it's not just about what's appropriate for one's body and riding style, but what's optimal for the terrain one rides.
It's more like choosing skis than choosing a road bike...
Garbaruk posted on instagram that they have a new product announcing tomorrow, but a guy that I believe is sponsored by garabaruk seems to have pulled the trigger on his post early.
Seems like Garbaruk is launching their own wheelsets, hubs, and spokes. Looks like some nice pieces, and it also seems like they have done a spoke very similar to industry nines "system" spokes.
Lets just hope they dont charge like €3k+ for a set, which is what a I9 System carbon wheelset with multiple colors costs here in europe. Post says "reasonable pricing" - Who knows what that is these days.
EDIT: Apparently its up on their website, with prices. Not cheap, but about €1k cheaper than an I9 Wheelset pre discount (I9 wheels are discounted now, but these are still cheaper)
https://www.garbaruk.com/wheels-parts.html
Took some screenshots, since this instagram post might get deleted:
Mineral oil swells EPDM rubber to about twice its size - and also reacts with certain plastics. EPDM is mostly used on bikes for DOT brakes but its commonly used in seals and foam that aren't in contact with oil but are exposed to the elements (nitrile rubber reacts with oxygen, and I think UV). Stuff like your fork sag o-ring is sometimes EPDM, but I'm sure a lot of other parts are too.
DOT fluid does strip paint but its also water soluble so pretty easy to clean up and only an issue if its left for a long time - manufacturers have been filling brakes with the stuff for decades so far and its not really been a major problem. Mineral oil needs degreaser or harsh solvents to clean up properly, and its thin viscosity means it loves to hide in nooks and crannys
Point is they are both pretty bad, and whatever precautions you take with one you should take with both. I've heard people describe shimano break fluid as "environmentally friendly" and have this idea that it is very safe to work with which is a dangerous myth IMO.
I agree. It also doesn't taste as good as it looks.
Loooool! Dario DiGiulio just mentioned bike brands converging on crab in the latest PB podcast (17:50 if you want to hear it). 🤣🦀
OHHHHHHHHH YEAAAAHHHHHHHHHHHH
Also, I'm sorry
Some really cool stuff on this frame. Nice refinements!
I've estimated a 19-20% leverage ratio in that configuration. It seems like the old leverage, but my estimate is that it goes degressive towards the bottom out(the last 20mm). This could be useful with the hydro bottom out on Rockshox.
The axle path in his current config goes rear about 7mm to 100mm of travel, then forward 8mm more than its starting point. The pedal kick is negative.
If I "flipchip" the main pivot and raise it, the axle path goes reward about 10.5mm and then forward past its starting point. The pedal kick was about 5deg or so in this setting.
I really like the countershox mounting location on BB!
Why did they leave the springs out of an exploded view?
Also, ratchet system seems to be a crab 🦀 in hub world.
I love the hesitation as he morally questions his word choice.
jackson's winning v10 from hardline has an STFU down low near the chainring (instead of on top of the stay like we normally see). why would you run this instead of just using a lower chainguide wheel? wouldn't they kind of do the same thing? maybe not identically based on placement of STFU, but surely a lower guide wheel would interrupt/isolate some of the chain flop to the chainring?
(scroll to pic 2)
With a lower CG it's still free to come up and slap the rear triangle. The STFU keeps the chain contained and dampens some of the forces of the chain flapping around.
It's a bit deeper than just the weight. The springs supporting the weight inside act as a damping force in itself. The force is transferred to the springs on both sides of the TMD, so if you pull on the bike for a bit of air, the weight is moving down in oppositionto the upward pull, vice versa with a downward force. It's tuned to the location on the bike.
I like to think of it as trying to level the bike like you would use a bubble level to square something you're trying to cut.
I was wondering if maybe the black ring shown between the ratchet ring and hub shell could be a rubber/elastomer spring.
Does anyone have an idea of what the red rings are for?
Must be for bearing preload or retention due to their positioning? The notches look like an interface so maybe they're threaded on the backside to preload the two bearings they're seated against?
The star ratchet is very thin, i guess because its a larger diameter than others (DT, One Up, Chris King (helix no star but same interface) it can get away with it.
They have a threaded end cap, so preload must be generated via the endcap for the whole system
That might not be a stupid idea. I've felt for a long time that problems with chain slap or chain drops have been related to the bouncing of the lower section of chain, and the current clutch derailleurs are a pretty blunt method of fixing it which isn't ideal. The digressive nature of using friction to stop the pulley means when it overcomes that breakaway force the chain will slap mega hard, so a more progressive damping system might be better and wouldn't add friction the suspension. This might be a slightly crude way of doing that, but I can see one way it could be working - giving the chain some freedom but would absorb the movement of bigger hits
I agree on the red covers/lids.
I also think claiming 60poe is ebike-safe is a bold move given even DT specs 24, but maybe they just warranty them out and it’s already priced in in a 500$ hub.
Without the lower guide the chain gets pretty slappy. He's been running this off and on for a bit.
Benoit uses something similar, even with a lower guide.
I was thinking about Benoit running the lower tensioner but couldn't find a pic, thanks for posting. Seems like he has been focused on reducing chain movement and noise for a while, possibly because he has previously ridden a belt drive bike and enjoys the silence.
Both solutions look good and I think reducing movement on the lower chain is a good move.
Look forward to hearing more on this. I always had good luck with the aluminum spokes on the I9 wheels I owned in the past.
Garbaruk wheels are already on their website, not sure if it's visible globally:
https://www.garbaruk.com/wheels-parts.htm
Thats a thick shaft on Jacksons DHX2.......
If they use the same diameter in the new float x2 it likely won't have cavitation problems