Let's say you're strapped for cash, but are splurging to buy a new bike. Do you go with the carbon version of a certain model, outfitted with so-so parts, or do you go with the aluminum version of the same frame with top-notch parts?
About Us
Contacts FAQ Terms of Use Privacy Policy Sign Up! SitemapAdvertise
AdvertisingCool Features
Submit a Story Product Photos Videos Privacy RequestRSS
Pinkbike RSS Pinkbike Twitter Pinkbike Facebook Pinkbike Youtube Pinkbike Instagram
Cracked carbon = done
THANKS benj1234, there is absolutely no information given to the people about the end life of carbon frames/parts.
Carbon is light, carbon is strong, carbon is beautiful BUT people need to open their eyes on the environmental impact of this material.
Contrary to aluminum or steel, carbon composite can't be recycled. Two choices: incineration or burying..
Nature gives us beautiful Forests and trials and in return, we are using polluting consumables such as seals, oils and tires, which contribute to her deterioration. This list doesn't need to be bigger ..oh, wait, i forgot gasoline to drive to our favorite spot !
With all these good alloy frames produced nowadays, we don't need these petroleum based materials to have fun.. pay attention to your choices, customers have the power, not manufacturers.
Freaking HIPPIES!!!!!
GET OUT OF HERE WITH THAT SHIT!!!
But in no way is the only choice to bury or incinerate.
I hope that recycling picks us, with it being the future and all...
Maybe Pinkbike could do a series on material science.
Carbon fiber is very unlikely to fail under load (the whole frame acts as a spring) but it doesn't like being impacted with hard sharp objects, like rocks.
The top tube on my alu frame met a big rock 3 yrs ago and has a big dent on the side, right in the middle of the tube's length. It doesn't look like it's gonna break anytime soon. If it did though, it would go to scrap.
The aluminium was originally mined from a huge open cast pit, probably in Australia, shipped to Asia, smelted using lots of power and co2 production then the bike to where in the world its required. Even recycled, the process occured in the first place, then a truck drove your street collecting, it gets smelted etc.
Carbon as pointed out has its issues.
Your rubber tyres probably originated from a plantation that had been cleared of rainforest first.
Etc etc and thats before we get onto driving to the ride which in some big countries that dont view distance as an obstacle and drive massive trucks, is even more impactive.
Then we get out in all our plastic clothing and skid about the country side, creating trails, building massive jumps (and leaving tonnes of litter next to them!?).
Surfing, climbing and most outdoor sports are the same sadly
Best not to dwell on it all otherwise we would be bored shitless!
The last Devinci Troy which TBH a mark in the top tube Devinci replaced the frame out of goodwill.
My son has a V10 and that's spot on well made and light.
Most dents will have a very minimal effect on strength, unless the bend radii are particularly tight.
My Transition has a really nasty dent just infront of the bottom bracket. It's survived over a year so far and I'm not at all worried about it. I know enough about stress analysis to know it's not an issue.
A correctly laid monocoque (one piece) frame IE Santa Cruz will be massively strong and highly unlikely to fail. but a frame made up of Carbon fibre tubes joined together by wrapping carbon (carbon fibre version of welding) will be heavy and have inherent weak spots.
Have a watch of this.
FYI my frame is Ali and boith my sons bikes are Carbon.
www.youtube.com/watch?v=d-hzgI4JK2k
www.ibiscycles.com/support/technical_articles/metallurgy_for_cyclists
PS I have an engineering degree (and am a Chartered Eng) so know most of this but it is relevant for those who don't.
Go find someone to hug and live your life people. Life is too short to ponder a purchase of carbon frame based on some fake ideals like environmental concerns about impact of MTB production and half life.
God is dead, I am God! I bow to myself and masturbate gracefully.
If you want meaning of life and all that... Life's short, live hard. It took 70 years to kill Lemmy so go for it.
PS you all should be riding rather than typing. Especially you Waki, the weather in southern Sweden was great earlier this week
this I think about often as well. It makes all we do seem silly. Someday all we know, including our "precious environment" will be gone like a wisp of smoke. Still we crave satisfaction and happiness in the moment - we are captive to our brains that were created through evolution to thrive on such temporary things as wood, dirt, friendship, food, drink, song and sex. So, I'll be happy in my folly while I build things of wood with my own dirty hands, have a chew, drink a beer, strum a guitar, then go service the 'ol lady.
directly from my heart!!
If people would quit making so many babies we would all be better off!
*Takes bulldozer and crushes trees in order to make berm*
Niiiiiiiiiiiiiiiice
My dream mountain bike is a Breadwinner Bad Otis with a bit of rear suspension and in stainless steel.
www.twinsix.com/collections/bikes-bits
They are not custom. And, likely built in Taiwan. But, they do a lot of steel and Ti road frames. Their steel is decently priced. Just another option. But, there are plenty.
1. Frame geo
2. Link design
3. Price I can find a used one
4. Design features (threaded BB, cable routing)
5. Availability of replacement wear parts (suspension bushings)
POWER GAP
353. What frame material it is
By the time I find everything I want there's normally only one option anyway and aluminum and carbon high end frames feel equally good to me these days.
"YT's Capra CF Comp is a strong value in its own right and doesn't compete with an equivalently-priced (yet better equipped) aluminum Capra."
Am i missing something here, whats he on about ? which Ali Capra is equicalalently priced to the CF-Comp?...And that the Capra Comp "doesn't compete" with ?
- Strength
- Fatigue life
- Failure modes
- Repairability
- Weight
Composites basically allow the design engineer to invent a material that doesn't naturally exist. A bike can have material where it matters most, saves weight where you can, deforms in a designed fashion, and fails in a way safer for the user.
A few points have been brought up against this material. Two I see as valid concerns:
1) Recycleability
2) Durability to laminate normal impact - AKA smacking into a rock
Like some have mentioned composites can be recycled, albeit expensively at this time. However what many choose to ignore is how little aluminum is actually recycled... Its an extremely expensive process, more so than harvesting the aluminum ore and refining it in the first place. So most of your aluminum frames are sitting on a landfill somewhere... Sorry to burst your bubble. Carbon is at least equivalent.
Regarding abrasion and rock strikes - yeah this is an issue. Honestly the ability of the frame to withstand this type of stress/wear originates with who designed the frame and the margins they used down to the lay-up and fibers used. Composites are kind of tricky to analyze from a stress perspective. Even at the level most isotropic materials such as aluminum need just 15 minutes, some knowledge, and a couple equations this analysis for composites requires a lot more tact. In aerospace a lot of the folks don't have time to pull off heroic wizardry of materials engineering and just design their composite structures to model an isotropic material - AKA "black aluminum" when done with graphite/epoxy. In short I don't feel as though, until very recently, there has been that "tribal knowledge" for composite frame design that alloy frames have enjoyed for a couple decades.
TLDR Version - carbon is magic, you can't stop the future.
There's two more concerns. Quality control (remember these "pre-production" Yeti frames where the chain stays delaminated?) and cost of tooling. Even the big companys like Specialized try to keep the carbon frame parts the same design for many years, because carbon fiber molds are just so damn expensive... Which makes it harder to change geometry etc. So it slows down development. Which, come to think of it, might be positive :-)
I can see how you might think that composites fail catastrophically, but they don't really.
A composite fails one layer (or lamina) at a time. When tested to failure, a typical carbon-epoxy composite looks like this: (www.scielo.br/img/revistas/mr/v9n2/29605f1.gif) . Often minor failures are ignored by the user until its too late unfortunately. Aluminum, however, takes the load until it fails completely through the whole part . See a typical 6061-T651 tension test plot here: (www.varmintal.com/engineering-stress-vs-strain-curve.png). And alumimum rarely bends - aluminum is really brittle in the grand scheme of materials. So it actually cracks without warning. Remember all those Intense 951 chain stay yokes?
As far as QC goes... You really can't cite a prototype as a measure of quality. Every prototype is made on non-production tooling and via non-production processes.
Outside of the price difference there really is no advantage to alloy frames.
If you do go with something you know you gotta upgrade. try to find something with good suspension at least. then upgrade everything else around it.
I prefer to thrash my bikes and not worry too much about the scratches and damage, in that respect I prefer Alu.
At my level of riding carbon frames are for "Willy waving'; aluminium frames are for the riders.
It will be the same thing 5-10 years from now. The market will push carbon, and carbon frames will get better and better, and you will find fewer and fewer performance aluminum frames. They will all be relegated to the budget "sport" models. (Think along the lines of a Specialized Hard Rock). You can argue with me if you want, but that's what's going to happen.
In fact, I think most of you "aluminum for lifers" would get a carbon frame now if you could afford it. Be honest with yourself.
Surely this defeats the point of the 'if you were buying a new bike' bit? And the last answer is more of a common sense statement than contrary to the other lot giving almost no actual gained information.
"YT's Capra CF Comp is a strong value in its own right and doesn't compete with an equivalently-priced (yet better equipped) aluminum Capra. But, hey, it's a pretty picture, so there."
The CF1 is about $1000 more than the AL1 (also an excellent bike), so they are not equivalently-priced. For the extra grand on the CF, you buy not only a lighter carbon front triangle, but a lighter wheel upgrade too. The AL1 is not better equipped.
Lets say a carbon frame is 500gm lighter than the same alloy frame. If you save that 500gm in a wheelset you will notice more of a difference than in the frame.
For me carbon frame is nice if i can afford it but quality wheels and suspension and brakes are going to give me more of a noticeable performance boost, whether im racing or not.
Just my opinion through experience. My race bike is carbon with ALL the trimmings and my everday bike is steel for durability!
Main problem i have is i blow freehubs constantly. Would either buy a second dt swiss wheelset or get a dt installed on factory wheels either way.
Nowadays an entry level carbon can have the same frame as the top model, a Pike for (or equivalent), and a dropper. What's left? Just the wheels. Sure you can spend money on bars and seats and cranks, but the wheelset is the only place where there is real weight. And the difference between the most expensive wheelset and the housebrand is less than you would think when you total up the weight of a tire and sealant and rear cassette. In fact the different between the $4000 entry carbon and $8200 top model, with the same frame, is probably 2-3 lbs. Thats a hamburger, fries and coke. You can't get around the weight of tires. A good tire is over 1000 grams, plus sealant. Go lighter and you cut, especially in the desert. Doesn't matter if the the bike is entry or top of the range.
I'm in the moderate crowd, so your mileage may vary. If I break a frame I probably have other worse problems.
Bikes rule.
@vesscsm was talking about, and this whole article was partly discussing, buying an expensive frame with cheaper spec.
I will pick something when all the "standards" insanity dies down.
Now I only have 3 bikes...
All Carbon.