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core559 paulaston's article
Nov 26, 2017 at 12:24
Nov 26, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
@polebicycles: Perfect, thank you!! And for those that don't understand why tensile (pulling) strength is relevant, an isotropic material has identical properties in both compression and tension, assuming buckling does not occur. so a 1" diameter aluminum rod that is twice as strong in tension, is also twice as strong in compression. It's the easiest way engineers can quantify the general yield strength of a material in a way that is not geometry dependent.
core559 paulaston's article
Nov 26, 2017 at 12:17
Nov 26, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
@polebicycles: Curious why you're talking about hardness, and not the more important mechanical properties like Kic, tensile strength, and modulus.
core559 paulaston's article
Nov 23, 2017 at 20:19
Nov 23, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
@Brightside: It's going to be a similar epoxy to what is used as the matrix material in a composite frame. It's not biodegradable, and not really recycleable. But if you dump an aluminum frame into a molten pot, it will burn off. on a composite bike frame, roughly 50% of the weight of the frame is the epoxy matrix. The epoxy might make up 1% of the weight of this frame if they're very liberal with its application.
core559 paulaston's article
Nov 23, 2017 at 20:11
Nov 23, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
@Gregorysmithj1: I would argue the opposite, I see cracked carbon frames on a daily basis, but aluminum frames almost never crack/fail. Perhaps that's the dependent on the quantity of both being sold. But one could argue that either way if provided with the appropriate data, however I highly doubt any company will release their warranty data to the public. Aluminum frames are hand welded. Almost no machines are used in the assembly/welding of a bicycle (head tubes, BB shells, drop outs, etc... are obviously machined, forged, or turned on their respective machine), whether that be aluminum or carbon. There could possibly be a few more jobs involved with hand laying a composite bicycle frame, but the additional energy usage (huge electric ovens to cure the epoxy, with production rates as low as 1 frame per day) are massive compared to aluminum. But this is mixing worker's rights into a discussion of environmental impact... Don't get me wrong, I hate e-mtb on so many levels. But carbon is comparably bad. The only place e-bikes belong is as a car supplement and/or replacement where they can actually do some good.
core559 paulaston's article
Nov 23, 2017 at 19:39
Nov 23, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
@Gregorysmithj1: But Lithium ion batteries are at least proven to be recyclable on a mass scale, even if it isn't being done yet. Carbon is incredibly energy intensive to produce. Last time I did any research, it had about 3x the embodied energy compared to aluminum. Do you have any proof or studies showing carbon fiber is worse that lithium batteries?
core559 paulaston's article
Nov 23, 2017 at 15:12
Nov 23, 2017
Pole Bicycles Announces New CNC-Machined 'Machine' - Press Release
Machine companies will sell back the chips from the CNC machine usually to a third party, which will give them a reasonably fair price for it. So yes, there is plenty of reason to believe that all excess material will be recycled because Pole would be losing money otherwise. As for the extra energy required for machining these frames from a solid billet, Finland uses roughly 50% renewable energy. Recycling carbon will be almost impossible for a while. The cross linking thermoset matrix the industry currently uses is extremely difficult to separate from the fibers. There are processes that burn the matrix from the fiber, or dissolve it using a chemical process, but neither of these are 100% successful and returning a virgin quality fiber that can be reused in new products. Until the industry can use a thermoplastic matrix that can be heated and removed from the fibers, recycling carbon will never be feasible on large scale. Sure there are inefficiencies in this process, just like every other process. But almost any other material is better than carbon when it comes to environmental consciousness for bicycles. It's a different story for aircraft, given that the lower weight air craft use less fuel. But for a purely leisure product, there isn't really a good reason to use carbon. Unfortunately the bike industry is pushing it down people's throat regardless of whether or not it's actually better for the consumer.
core559 mikelevy's article
Aug 30, 2017 at 7:59
Aug 30, 2017
Niner Rip 9 RDO Push Edition - Review
@carym: Pivot 5.5 X01 wheel upgrade. Comes with DT M1700, a $300 wheelset.
core559 mikelevy's article
Aug 28, 2017 at 11:47
Aug 28, 2017
Niner Rip 9 RDO Push Edition - Review
For $7100 Pivot, you don't get a dropper. It comes with DT XM wheels. Raynold's wheels are an upgrade. You pay extra for the known reliability of Enve over Reynold's which fall far short of Enve's reputation. The Pivot XTR 1x build with dropper and non Enve carbon wheels is $9300, $200 more than this. To get Carbon wheels on the IBIS is $8400, which once again is their house brand wheels. Comparable to Enve for sure. But then you don't get a kashima shock. Has XT brakes instead of Guide RSC, which is down to personal preference really. But the Guides are more expensive. The Turner is $8400 with 11-6 and Enve, but still comes with a Pike, cheaper brakes, and unknown handlebar.
core559 mdelorme's photo
Jul 31, 2017 at 16:23
Jul 31, 2017
@FrozenTreads56: 7th to be exact... but still a really great photo.

core559 KLandry's photo
Jul 21, 2017 at 9:16
Jul 21, 2017
Gotta be pretty dark in there for iso 8000 and f2,8 and only 1/500

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