Protour

  • Member since Sep 4, 2011
  • 114 Followers
  • Vancouver , British Columbia
  • Male / 40

Canadian

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Sep 13, 2014 at 7:14
1 days
Protour mikelevy's article
Sep 9, 2014 at 3:41
Sep 9, 2014
2015 Devinci Wilson SL - Interbike 2014
No, the main pivot is the higher one. Otherwise with a main pivot lower than the BB it would have a horrendous axle path and even worse front & rear suspension axle path balance than the new Specialized Demo.
Protour pinkbikeaudience's article
Aug 29, 2014 at 7:23
Aug 29, 2014
Results: World Cup Round 7 Meribel - Finals
"Speaking strictly about static chassis reaction and negating dynamic concerns:If your IC is above your ground plane and in front of the rear axle you will have some a suspension compression reaction during braking. If your IC is below your grond plane and in front of the rear axle you will have a suspension extension reaction during braking. If your IC is below your ground plane and behind the rear axle you will have some a suspension compression reaction during braking. If your IC is above your ground plane and behind the rear axle you will have a suspension extension reaction during braking." Dave Weagal Suspension extension during steep terrain, when you are behind the rear axle, is the problem with the Demo. The wheelbase on the Demo changes more radically than any bicycle in the history of mountain biking. This is what creates the "bucking bronco" effect that I have described on the Demo, because of the extreme upward and inward axle path, when it extends, creates what can be best technically described as a 'rider ejection machine', when you consider the angle of its axle path in steep terrain. Not to mention the traction issue it creates with the the front tire surging ahead when you touch both brakes and the rear suspension extends. On steep, rough terrain, this bike simply is not well-grounded, it is a bucking bronco. In addition to being unstable, a bike with that axle path, and the wheels constantly fighting each other, is also not going to carry momentum as well.
Protour RichardCunningham's article
Aug 29, 2014 at 5:57
Aug 29, 2014
Exclusive: Sam Hill's Secret Weapon
I'm flat out of them.
Protour pinkbikeaudience's article
Aug 28, 2014 at 7:14
Aug 28, 2014
Results: World Cup Round 7 Meribel - Finals
ka-brap: "The only big brand that has been less successful since Gwin left Trek, is Trek actually. With Gwin and Brosnan on Specialized they have done far better than Trek has and this is the only factual information I can see so far." What about salary, is that "factual information" Gwin is definitely making more money per year than the entire Trek DH team, and Brosnan probably isn't far behind. In terms of expectations, Gwin's move to Specialized has been the biggest disappointment in the history of mountain bike racing. For the salary he is making, Championships are expected. I think he is on his 5th Specialized DH bike in less than 2 years, not counting the enduro. They can't make a Demo that works for him, and this one won't be around long either.
Protour pinkbikeaudience's article
Aug 28, 2014 at 7:01
Aug 28, 2014
Results: World Cup Round 7 Meribel - Finals
jclnv "Specialized said they've kept the kinematics the same so yes I imagine they achieved by the lower Horst link location, shock link size and position etc." It would be impossible to have it be the same if the BB is that much lower. Again, the Horst link only rotate slightly. Are you capable of understanding that the Horst-link is NOT the rear axle of a bicycle? I like the "etc" part of your quote, thanks for filling in all the details. jclnv "An axle path's manipulation has vastly more to do with manipulating anti squat than impact absorption." What is your definition of anti-squat? jclnv "the reason Honda and other multimillion dollar R&D programs don't care about "axle path imbalance" is the phenomenon only occurs in your mind." No, the results of the instability it can actually be quite disastrous on the race track. http://m.pinkbike.com/news/troy-brosnan-crash-video-2014.html jclnv "If suspension designers were concerned about axle path they would be far more worried than the effect on the rebound stroke than compression." They should be, but not at Specialized. The new Demo is s a bucking bronco in steep rough terrain, just waiting for that upward-and-inward axle path to rebound and eject the rider.
Protour mikekazimer's article
Aug 27, 2014 at 21:27
Aug 27, 2014
Yeti, Giro, HT - Eurobike 2014
Looks promising to me also, but I'm sure Yeti could keep you more informated about it better than I could. It appears to have a range of axlepaths depending on which way the impact comes from, sorta like their old DH bike with rails or the old Cannandale DH bike with 2 shocks.
Protour pinkbikeaudience's article
Aug 27, 2014 at 21:11
Aug 27, 2014
Results: World Cup Round 7 Meribel - Finals
jclnv: "Every design is a compromise but once you understand the numerous factors involved you'll begin to see that Specialized have a very good understanding of the subject." Completely lame Specialized suck-up statement, of course you don't want to admit some suspension designs are better than others because you are defending an inferior one. What are the negative trade-offs of the DW Link? I love the complete trust you have for Specialized in the last part of the statement. Yeah, I understand the factors involved, it was pretty well explained in article Pinkbike did where the Specialized engineer explained that the goal was a lower center of gravity, and that they thought the Ohlins shock would make up for the admittedly inferior suspension design. Of course he didn't talk about axle path like Dave Weagal or most other suspension engineers would, because this bike obviously has an atrocious one. Specislized admitted they sacrificed suspension design performance for a lower center of gravity, that is the main "factor" here. Did you miss that article? http://m.pinkbike.com/news/specialized-demo-2015-troy-brosnan-tech.html Its as if you guys don't have eyes when you tell me to produce 'data' that proves this is a bad axle path when it obviously moves up and down at nearly the complete opposite angle of the front suspension. How could any axle path be worse, or even more out of balance with the front fork? The main pivot would obviously have to be even lower than the BB, but of course no suspension engineer is stupid enough to do that. Though if Specialized ever did it, I'm sure you guys would be convinced it was am improvement.
Protour pinkbikeaudience's article
Aug 27, 2014 at 7:27
Aug 27, 2014
Results: World Cup Round 7 Meribel - Finals
Ka-brap, no data is necessary, the new Demo has the most upward and inward axle path of any full suspension bike created and also has the worst front and rear suspension axle path imbalance of any full suspension bike in the history of mountain biking. Nothing you say can change that. Gain is 0 for 10 on the Demo after being the most dominant rider the World Cup has ever seen. That is not even a decent result, his move to Specialized has been embarrassing to watch. jclnv: "I imagine the link length, angle etc are modified to give similar kinematics to the previous Demo. Overall I would imagine the axle path (which I'm not saying is critical to suspension performance) is slightly less forward, especially in the first 50% of travel, than the old Demo." You imagine? How utterly unconvincing. Stop using your delusional imagination because it is dead wrong, like pretty much all your desperate points. Of course you don't think axle path is important, your #1 priority in life is defending Special Ed and the retarded decisions they make at times. But most suspension designers actually do think it is crucial, if you listen to them talk or read online discussions between Weagle and others. Axle path isn't as important in moto. They have engines. They don't coast, so momentum isn't as important. You keep getting more desperate to make a point but have yet to actually accomplish that. You are just making it obvious you don't know much about the subject at hand. ps. You never answered my question.
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