Recent Activity
All
Dave_Camp Liked a reply to forum topic MTB Tech Rumors and Innovation
5/18/2025 8:09am
This forum topic has 30444 replies.
NoahColorado Liked a reply to forum topic MTB Tech Rumors and Innovation
5/18/2025 8:09am
This forum topic has 30444 replies.
Dirt Bag Racing Liked a reply to forum topic What Frame/Component/Gear/Accessory do you Wish existed?
4/22/2025 11:20am I wish Vans would make a real mountain bike shoe with proper toe protection, flats and clipless. Every other brand just makes ugly ugly shoes.
This forum topic has 88 replies.
El_Kinematico Liked a reply to forum topic Case Study: Jekyll DH Data Logging Setup
4/22/2025 11:18am Thanks Ryan, I miss working with you and trying to chase you sown the hill. I needed all the help I could get with the set up just to keep you on my sight, lol. you are right, and most often than not it is very common to be on the wrong wheel rate and with the rebound wound too slow.
This forum topic has 48 replies.
MSTRCHRS Liked a reply to forum topic Case Study: Jekyll DH Data Logging Setup
4/21/2025 4:58am Hi Luis, I just started reading during coffee break and will have to finish later! What I read so far was super interesting, and I could relate to the feeling Matt startet with and the changes you made. Been down the same route... Keep it coming! Chris
This forum topic has 48 replies.
Ryan Burney Added a reply to Case Study: Jekyll DH Data Logging Setup
4/21/2025 4:56am Really cool stuff, Luis! Love that you’re dialing things in based on wheel rates, makes total sense. It's fun to think how much more people can get out of a bike with setup and not changing out a single part. The number of times we’ve found out someone’s just on the wrong shock tune or turns their compression knob the...
El_Kinematico Liked a forum topic Case Study: Jekyll DH Data Logging Setup
4/21/2025 4:40am My name is Luis Arraiz, I am a frame design engineer and specialize in bicycle vehicle dynamics, kinematics and geometry design. I was the founder of K9 Industries Ltd in 2005 in the UK. I worked at CSG (now Pon) from 2015-2023 where I was responsible for the geometry, kinematics and packaging for all the full suspension bikes both analogue and e-bikes for both Cannondale and GT bikes and also several GT hardtails. I introduced the concept of size specific geometry and kinematics for Cannondale dubbed “Proportional Response”. I am now back to the UK, where I am a senior...
This forum topic has 48 replies.
Lolo.ch Liked a forum topic Unchained Bicycles – Pinion / Belt / 7075 Bonded Frame / 170-170mm
4/9/2025 7:28am Hey everyone, I figured it was time to share a project that’s been quietly evolving over the last 10 months. I’m Laurent – a mechanical engineer and lifelong bike nerd. Together with my friend and coworker Axel, we’ve been designing and building our own custom enduro frame from scratch. This started as a passion project. We wanted to build the kind of bike we couldn’t quite find on the market. we’re just two guys who love riding bikes and wanted to make something that is durable, quiet, easy to live with, and above all, fun to ride. Somewhere along the...
This forum topic has 34 replies.
jeff.brines Liked a reply to forum topic The Bikeconomics (Mega)Thread
3/22/2025 7:48am We've obviously talked about this a lot, and I’m in a bit of a unique spot, having played the “CFO” role at a small, vertically integrated manufacturing company in the outdoor space. I don’t think I’m oversharing when I say it’s a labor of love. That’s not to say Intend isn’t profitable, but let’s be real: Kornelius could probably make a lot more money as a founder/design engineer in just about any other industry. I touched on this in the podcast I did a while back, but the IQ level in the bike industry is wild. You’ve got incredibly talented...
This forum topic has 5049 replies.
Ryan Burney Added a reply to Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/21/2025 4:51am That's a great recommendation! And thank you, that's very kind!
Vincent P Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:30pm Carbon/epoxy twill (woven with as many fibers in 0 and 90 degree orientation) mostly behaves uniformly in all directions. Using an isotropic material with stiffness (Young's modulus) of about 60 to 70 GPa is going to be pretty representative on much easier to simulate. Simulating how the fabric drapes over a shape is especially important when using materials with fibers all aligned in one direction (unidirectional materials) or when analyzing potential failure points. In this case, the key factors affecting stiffness are the shape of the component—ie open or closed cross-section, and the thickness of the material. To test this...
This forum topic has 52 replies.
rhodefab Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:29pm In other words the swing arm looks like a triangulated structure. If you are looking for stiffness, I'd look at the main pivot or the bolt on drop outs
This forum topic has 52 replies.
rhodefab Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:29pm
This forum topic has 52 replies.
carlinojoevideo Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:29pm
This forum topic has 52 replies.
SteveClimber Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:29pm Exactly what I was thinking of doing. I just don't have fancy machining, and also I wouldn't do it with a wheel on, I'd just load the axle directly.
This forum topic has 52 replies.
earleb Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/18/2025 2:29pm Do you have a big flat heavy surface you could mount the frame to? Wouldn't take too much to replicate what Joe did in this Starling video. https://www.youtube.com/watch?v=zto62OypjUk&ab_channel=StarlingCycles
This forum topic has 52 replies.
SteveClimber Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/17/2025 1:58pm The other interesting part I don't see discussed often is that aluminium does not have a fatigue limit. The wording of that is slightly confusing if you don't know what it means, but essentially aluminium will eventually always fail from stress cycling at any stress level after enough cycles. Steel has a limit, where as long as the stress is below it's fatigue limit, it will not fail no matter how many cycles. It takes quite a while, but generally aluminium cracks around the 500 million cycle mark, at least that's what airframe engineers assume. If your a boat person...
This forum topic has 52 replies.
Ryan Burney Added a reply to Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/17/2025 1:46pm It depends on the company. Big bike brands likely have advanced simulation programs, but as you mentioned, they’re expensive and require time to master to ensuring real-world accuracy. You can achieve a lot with a simple SolidWorks FEA assembly and a test fixture. If you have a physical test rig and model that same setup in FEA, you can get...
bmxconan Liked a reply to forum topic Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/17/2025 1:26pm So how available are FEA tools to your typical bike engineer? When I worked for a product design agency my boss mentioned we were quoted €25k for a seat of legit programme (he saw the built in FEA in solidworks as Mickey Mouse), he also mentioned there was a pay as you go option but it was €1k a simulation or something nuts. I understand how people use solidworks to basically create fatigue maps but modelling a swing arm seems quite sophisticated especially if you’re trying to model in a shock that maybe hasn’t hit the market.
This forum topic has 52 replies.
Ryan Burney Added a reply to Can You Fine-Tune Frame Stiffness With Just Bolt-On Bridges?
3/17/2025 12:56pm Bikes are simple but can also be hard. Making a good bike is one thing but making production runs of good bikes that consistently last 10+ years for a consumer is a whole nother game and the hard lessons don't get to be learned for many years down the line. Let's say you started a bike company now and you...