Threaded carbon Bottom brackets? Could this work?
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- Опубліковано 1 жов 2024
- #roadcycling #hambini #bottombracket
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I'm not an engineer, but why would it be easier to incorporate threads in the carbon then make an accurate round whole?
The industry has moved to new threaded standards so this aims at weight saving around the standard. Less risk of galvanic corrosion with a a second interface.
Make good carbon frames for 1/10th the current cost, then manufacture them with accurate round well aligned holes.
Too much to ask?
Steel is real. NEVER a problem with bottom brackets.
Dumbest idea ever,even if the bike industry was know for quality control and accuracy which it is not.
Waynos: Threaded carbon Bottom brackets? Could this work?
Hospital ER team: Hello, is this Hambini?
Another "mission impossible" for bike industry, and headache for cyclists and workshops. Pie in the sky!
Basically, they should just send it to me so I can test it. I note that Classified didn't send me a hub either, perhaps because their claims were somewhat dubious.
Basically it may work, but everything in the bicycle industry needs wiggle factor as it is not a precision industry. This is why it will fail like other precision manufacturing ideas from manufacturers.
🤔what about carbon pedals tho.? I don’t know exactly how they are designed/assembled, but they are made from injected resin and there has never been a problem (AFAIK). Injection moulded carbon components seem to be consistent in quality. BUT a carbon injection moulded, threaded BB still seems like a bad idea, no way would i buy that.
If you are talking about the injected type of plastic, nylex, nylon as used in retic piping which is threaded. This is a completely different product and is relatively heavy. Yes this works, but I don't think we are going to have bikes made out of this type of plastic. Also the thread is not that fine. I don't know about the pedals you are referencing, but what pedals have thread in the plastic directly?
@@waynosfotos Dura Ace carbon pedals I think have an axle assembly threaded into a carbon body. I don’t have a pair to check out anymore. But maybe not. The UA-cams suggest otherwise. I had plastic bodies Time Attack pedals once upon a time (haha) which iirc had a metal cap that threaded on to the plastic body that held in the axle assembly. Again just going by memory. I could be wrong.
I’d say no! They’re making things more flimsy that won’t last. Any thread failure wound be costly (new frame)
It'll probably work. In the yacht world they've been threading carbon for huge loads. But why is my question. It's another fiddley gimmick that doesn't really improve the bike much and makes the bike easy to ruin. Cross thread?
My Colnago CX1 is now almost 20 yrs old, on it's 6th bb of various types... titanium bb shell, seat tube insert, headset too. I ride the pi&& out of it, change components at will, replace stuff as it wears and alter my setup as my bod wears...I did have to replace one derailleur hanger and a few headset bearings but the alloy inserts make that "no drama" (I don't have a torque wrench even). Alloy dropouts, too. No sign of electrolysis. I think it blows that theory out, probably because these were made carefully..So. it's at ~ 16.5 lbs with all that metal, shimano 8000 mechanical, 50mm high carbon tubular rims. durace rim brakes.
It's as good as any new bike, I would not trade it for very many of what they sell today.
So carbon BB? Sure, it'll probably work for while
but why
I would think that this bb shell is a moulded unit using chopped up randomly oriented fibres like Magura Carbotechture (or whatever it’s called) brake components and certain pedal bodies.
I'm patiently waiting for the "Chocolate top tube" it can't be far off now!
Not going to work and the expenses of ripping the thread out
I know, you go first and see how well it works.
Alloy threads especially fine threads are fragile enough its never good long term to use plastics or composites for fixing parts together. Very easy to strip. I prefer a courser thread of quality steel alloy, even with a slight weight penalty, but you wont see that in the bicycle industry as a rule. Very hard and prohibitively expensive to tap a large thread out and install a helicoil or a threaded insert of bb size. I've done a few steel insert to repair failed alloy threads and a composite thread.
Isn't there a small amount of shrinkage also when the composite is curing? Prototype is one thing but I feel this will be incredibly hard to mass produced.
Yes that is correct. Why the strands need to be even around the BB
At least the threaded mandrel guarantees the hole will be round and concentric when a frame exits the curing oven. After that, corrosion over time could become a problem. At least there isn't an aluminum insert to become disbonded. No additional manifold standards to navigate as a bonus. Let's give it a chance! One way or another manufacturers have gotten the round hole very wrong, and this will be right at least initially. A round hole with press fit would be better, but so far its been hit or miss.
Well think about this, do you know another application where a tapped or thread has been made directly in carbon fibre or fibreglass?
@@waynosfotos Well, no, but if they can get it right, you'll know immediately. If not, they'll have some mighty unhappy investors. Law of the jungle! Darwin usually wins.
Not true, as distortion can occur on part removal from the mold tool.
It will be interesting to see what Raoul at Leuscher Teknik makes of this development. Until then, im un decided although i agree it looks quite fragile and definitely not long lasting.
He didn't like it. He has a vid up already.
Probably it will work once, and will last forever if stays in shop…can imagine how many bones will be broken by sprint and 1000w ..or how nice threads will crush once you tight Shimano bb with 20Nm