Endurance Bike made from scratch

[DRM]

https://en.wikipedia.org/wiki/Open_Cycle
Set up by Gerard Vroomen and Andy Kessler, co founders of Cervelo

 

[Arrowfoot]

@SkipdiverJohn, @DRM

Yes, both Open and Cervelo have the same parentage and marketing approach. Carbon is manufactured by hand and consistency is an issue hence the warranty claims are important for reputable companies.

Here is a major design fault on the Cervelo where no recall was done. Whoever designed this either has no clue about carbon material or knew that it would not last. As the fault is on the head tube region where load is critical, this is bad. After this, you could see the dumping on the second hand market.


View: https://www.youtube.com/watch?v=yajCXeNTbqk

 

[FrankCrank]

Reading this, and seeing the 2 vids, I'm glad to be at the 'jumpers for goalposts' scale of things when it comes to bikes, rather than the premiership

 

[DRM]

Reading this, and seeing the 2 vids, I'm glad to be at the 'jumpers for goalposts' scale of things when it comes to bikes, rather than the premiership

You and me both

 

[SkipdiverJohn]

I'm sticking to 531 steels for my quality frames, and if that makes me a Luddite, then so be it. My oldest one is 36 years old now and still as good as new. I don't think there will be many 36 year old carbon Cervelos still riding around in future.

 

[DRM]

@SkipdiverJohn, @DRM

Yes, both Open and Cervelo have the same parentage and marketing approach. Carbon is manufactured by hand and consistency is an issue hence the warranty claims are important for reputable companies.

Here is a major design fault on the Cervelo where no recall was done. Whoever designed this either has no clue about carbon material or knew that it would not last. As the fault is on the head tube region where load is critical, this is bad. After this, you could see the dumping on the second hand market.


View: https://www.youtube.com/watch?v=yajCXeNTbqk

Wow, just wow I cannot believe a cam arrangement that pushes against the headtube made of carbon fibre is used as an end stop, I make no wonder they issued empty threats to sue Hambini

 

[Cycleops]

What a strange thread. OP wants advice on a company which he says is good despite evidence they are far from that.
I wonder what the truth behind it is?

 

[Blue Hills]

What a strange thread. OP wants advice on a company which he says is good despite evidence they are far from that.
I wonder what the truth behind it is?

OP has some connection with the company I can't help but think, as alluded to upthread.
OP seems to have gone quiet.

 

[fair weather cyclist]

You're a smoothie aren't you ?

Based on their location (Monaco) I wouldn't expect anything less than a rude twat

 

[T4tomo]

the "problem" with CF is that you can make it up into any virtually shape, so companies such as Cervelo, who have a big TT bike background, think oh that's great, we can make it more aero / lighter, but changing this or that etc, and sometimes their desire for form, lightness and aero dynamics feck up the function side of something, such as the headtube integration above or lack of structure in the OPEN BB etc.

 

[Arrowfoot]

Do not be disheartened. Carbon like the other 3 common materials for frame are good and each has its own personality. What were shown are technical and engineering flaws and not subjective. One is a misshapen bottom bracket ( a manufacturing defect ) and warranty denied. The second is truly inexcusable as it was no ordinary design fault. The design intent I suspect was to show that it was different to other head tubes and therefore aerodynamically better.

Even good brands do have the odd manufacturing defects. A replacement will done in such cases and warranty honoured. Design flaws generally when identified will trigger a recall. But again, these are good brands.

Do enjoy riding your bikes whether they are steel, aluminium, carbon or titanium. Enjoy the merits that each material brings to the table.

 

[cougie uk]

Where did the OP go to ?

 

[bitsandbobs]

Hambini is the Durianrider of bottom brackets.

His fix at the end of the open vid makes the bike impossible to build up!

Oh, and he mentions at least a couple of times he doesn't know why the drive side chainstay is dropped.

 

[Reynard]

CFRP is an excellent material to work with, but you really do need to know what you're doing. It's not like it's a new or exotic technology these days.

Designing components (bicycles included) out of fibre-reinforced composites is very much an exact science, and requires an in-depth understanding of exactly how the loads are transmitted through the structure before any decisions can be made regarding materials selection and lay-up. Yes, lay-up is still largely done by hand, although more recently, parts of the process that can be automated have been. But a fabricator worth his or her salt should be able to keep flaws such as resin pockets to a bare minimum.

There also should be an adequate factor of safety built in to protect against failures through normal use. Anything less is just poor engineering practice.

Maybe I should be glad that bikes like these are waaaaaaaay above my budget.

 

[DCBassman]

Maybe I should be glad that bikes like these are waaaaaaaay above my budget.

Even were this not so for me also, I think that, like heights, contact lenses, beetroot and clip-in pedals, a carbon bike is simply not...not...you get it.
It would be like riding an Airfix kit.