Saw this over at dirtmag
www.dirtmag.co.uk/news/category/dirt-team/exclusivefabien-pedemanauds-bos-morewood/
Sick looking bike.
www.dirtmag.co.uk/news/category/dirt-team/exclusivefabien-pedemanauds-bos-morewood/
Sick looking bike.
That bike is a beast
Kind of strange frame color. I would have chosen something else for marketing purposes but the bike looks fast.
What tires?
you won't have to wait :Awesome looking bike though, cant wait to seen nico's lapierre with all of the boss suspension on
seems to be a Commencal, i liked much the old oneThat bike is a beast
ya, totally, just look at how many World Championships Peaty won on that Oran......... uh, never mind. oster_oops:whoa, eventually we got a bike with REAL suspensions and no fluffy marketing virtual floating dw pivots : D
fixedya, totally, just look at how many World Cups Peaty won on that Orange
dirt bikes weigh 200+ pounds and have something called combustion......this is the most moronic comment i've seen.....fixed
dirt bikes doesn't seem to suffer much the absence of virtual pivot designs either
Nor do they see changes in the direction of chain torque, or have to deal the same type of low frequency oscillation input (4 to 5 times the mass of the vehicle).fixed
dirt bikes doesn't seem to suffer much the absence of virtual pivot designs either
When you motorise your DH bike and increase the weight by a factor of five let us know.fixed
dirt bikes doesn't seem to suffer much the absence of virtual pivot designs either
ok i've been rude, and i want to apologiseWhen you motorise your DH bike and increase the weight by a factor of five let us know.
A much heavier bike means that you have a much heavier rigid sprung mass (first of two degrees of freedom in bike suspension, well 2nd of three if you count the tyres) which means that the suspension characteristics will be totally different; you can run a LOT more compression (even for the total weight of the bike/rider combination) because the rigid motorbike part doesn't complain about shock loading. More compression (or more damping in general) tends to lend any bike more stability up until the point where the suspension can't absorb bumps freely, which is part of the reason why motos can be smashed through rediculously rough terrain at 100km/h while we're feeling sketchy at 60km/h. It also means the centre of mass is a lot lower - lower CoM means less weight shift under acceleration or braking. Less weight shift means you don't have to worry as much about anti-squat (or anti-rise/pro-squat in the case of braking), which is part of the reason why motorbikes don't benefit as much from floating brakes as DHers do. Strength etc are dependent on the specific design and manufacture - there are plenty of strong and weak, stiff and flexy bikes out there, both multi-pivot and singlepivot.ok i've been rude, and i want to apologise
but the matter seems very interesting to me:
first of all, i can't see why a heavier bike makes a difference (besides having to build stronger frames and use heavier springs)...
maybe you're saying that single pivots are stronger and less incline to torsion and so heavy motocross bikes are forced to use them? or is it about something else?
about having the engine or not: i see pedaling forces are much different compared to those expressed by an engine, but i don't see pedaling efficency being the N 1 priority on a DH bike... not compared to ability to keep traction, resistance to torsion, etc... do you agree?
i mean, a DH run lasts 2-4 mins, and any pedal efficiency difference has to be VERY big to be significant is such a short time (and you're not even constantly pedalling for all the time)
i think shock could make a much bigger difference about all of this, but everyone keeps on developing new convoluted frame designs and selling them with crappy shocks... and they don't even bother making sure they're valved appropriately at least for the leverage ratio (there a few exceptions, i know...)
[btw i'm not an engineer, i'm just a third year biology student with a basic physics background... but i'm eager to learn]
i do not quite get this partA much heavier bike means that you have a much heavier rigid sprung mass (first of two degrees of freedom in bike suspension, well 2nd of three if you count the tyres) which means that the suspension characteristics will be totally different; you can run a LOT more compression (even for the total weight of the bike/rider combination) because the rigid motorbike part doesn't complain about shock loading. More compression (or more damping in general) tends to lend any bike more stability up until the point where the suspension can't absorb bumps freely, which is part of the reason why motos can be smashed through rediculously rough terrain at 100km/h while we're feeling sketchy at 60km/h.
The rigid sprung mass of the motorbike (engine, frame, gearbox, seat, fork uppers etc - a fairly sizeable weight) provides a large amount of mass/inertia that you can use to your advantage as far as damping goes. Because it has all this mass, you can use a lot more compression damping (proportionally) than you could if the bike weighed only say 20kg instead of 100kg. The reason for this is that a large shock loading to the wheels of the motorbike will compress the suspension quickly and create a relatively small but sudden displacement of the bike's sprung mass (even without a rider on it). The thing is, the impulse (force x time, equal to the change in momentum of a body) required to move a heavy bike even 1" very very quickly is huge, because if the time component of the impulse is short then the force component has to be very large. High force = high acceleration = what feels harsh to a rider. However, when this force is being essentially "damped" by the huge sprung mass, the rider cops a lot less punishment. Again, this is why motos can run a lot more compression damping and go a hell of a lot faster over much bigger bumps than MTBs without threatening to kill the rider.i do not quite get this part
what does "the rigid motorbike part doesn't complain about shock loading" mean?
could not agree more... this is why I will always love racingIt's gonna be a stormer of a WC year, so many new teams, more money, ripper tracks, bags of riders.......can't wait!
its actually clear powder over gold passivate, so its essentially a raw frame with clear powder coat^^ gah was about to post that
ROOOOTBEER~~~
Results:
http://esmtb.com/GP_Marzocchi_Sant_Andreu_de_la_Barca_mtb2469
Fabien Barel loks pretty stylish in his new lid and Bolle goggles, He has the most "euro" kit and bike ever but it comes together pretty well. Cedric is back to, on the pipe for a chap who has only been on a bike for a week or two, Pascual Canals is showing his 4th at worlds wasn't a total weather fluke either.
It's gonna be a stormer of a WC year, so many new teams, more money, ripper tracks, bags of riders.......can't wait!