Recent Activity
All
fluider Added a comment about bike check MYOTRAGUS Dorothea DH
1/7/2023 8:32pm
Thank you. Now it's clear that lower main pivot is eccentric as well. I thought so but wanted to be sure. I'd love to see kinematics graphs of this thing, one mighty interesting frame!
This bike check has 14 comments.
fluider Added a comment about bike check MYOTRAGUS Dorothea DH
1/7/2023 12:42pm
Hello @Primoz, I can't access that IG account through Facebook login because servers are unable to redirect in my case. Could you please attach here some screens from Myotragus IG gallery? I am mostly interested in the lower pivot area (over the gearbox). This is the 1st bike since STRUCTURE.bike that I have been studying for quite a lot of time as there are many very interesting details. Thank you for help :-)
This bike check has 14 comments.
fluider Added a comment about press release Bontrager Introduces the Updated Flatline Shoe
11/5/2021 4:24pm
I've been using them for the last almost two yest, almost daily commuting to work (13km one way) with regular pump track training and local park riding when family doesn't notice it. They are my first regular flat pedal shoes and I'm loving them but: - I had to buy orthopedic insole because the original insole was a garbige. If all flat pedal shoes use flat insole then they are garbage. Before, I was always using Specialiez BodyGeometry clipless shoes nad I have NEVER had problems with my knees or ankles. With these shoes I was forced to buy new...
Votes:
This press release has 4 comments.
justinc5716 Liked a reply to forum topic Are Upside-Down forks really flexy?
3/5/2021 12:07am
I'm so glad to see some independent engineering work going into this. Doing FEA is second-best to getting an independent lab to actually MEASURE these things. As an engi-nerd I'd really love to see that data. I used to race sportbikes and grew up riding motocross, so this has always been a quandary to me. Especially in the world of sportbikes, front end stiffness is critically important. Keep in mind you hear a lot these days about chassis flex in WSBK and MotoGP, but that is different from front end stiffness. In that regard...more stiff, more better. The reason has...
This forum topic has 82 replies.
fluider Added a reply to Are Upside-Down forks really flexy?
1/26/2021 10:11pm But you already know what has lower friction compared to sliding friction of bushings. Rolling friction of rollers.Or you could design a super-sealed and pressuried hydraulic chamber in the outer legs where innner stanchions would move. Just like turbocharger shafts spin within the oil bath instead of on rolling bearings, because rolling bearings can't whitstand the high rpm and temperature...
fluider Added a reply to Are Upside-Down forks really flexy?
1/14/2021 5:11am @Primoz. I checked the FOX drawings, and they as well spec tolerance +-5mm for axle-to-crown distance, the same as RS on Lyrik from 2009. Wheel axle offset tolerances with +-2.5mm :-D. By any means do I consider such variances worth of premium price. FOX 38 2021 spec As for Ocho. Yes, it's shorter chasis when compared to FOX 38 (but...
fluider Added a reply to Are Upside-Down forks really flexy?
1/12/2021 9:24pm Or Pinkbike's huck-to-suck video compilation here:
At 1:55 starts Cannondale Ocho fork that has probably to lowest fore-aft flex from the entire video despite being XC fork and only single-leg. Directly after Ocho goes FOX 38 that have notibly greater flex.
fluider Added a reply to Are Upside-Down forks really flexy?
1/12/2021 9:15pm Why do you consider making the properly toleranced hollow space for sliding bushings a problematic, when manufacturers have no problem with making the properly toleranced hollow space for damper piston? It's not about possibilities, but about their design and production quality control. I have seen a picture of some modern day FOX 36 fork with MISALIGNED dropout holes, clearly visible...
fluider Added a reply to Are Upside-Down forks really flexy?
1/8/2021 3:25am The images show displacement of particular model points (in mm). Not actuall stresses (MPa).
fluider Added a reply to Are Upside-Down forks really flexy?
1/7/2021 10:51pm Hi Primoz. I'm attaching picture of very interesting laboratory test that I found when studying Cannondale Ocho fork. That test was performed by Mountain Bike Germany magazine, I don't know when, but according to tested fork models, it must have been long time ago :-) in order to compare stiffness levels of one of the firts Lefty versions with its...