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Kapolczer Liked a reply to forum topic MTB Tech Rumors and Innovation
10/26/2025 9:05pm
Paul Aston had a short but unbiased review of them earlier this year. https://www.astonmtb.bike/reviews/raicam-rgr-factory-brakes-review
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Downamics Liked a bike check Downamics Gamux Sego
10/26/2025 1:31pm
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CascadeComponents Liked a reply to forum topic @Cascade Components - Homework Help
10/24/2025 9:46am
The dimensions aren’t well drawn to be honest. What I did there is a graphical approximation of leverage ratio by the way. If you dimension the shock ever so slightly shorter (in this case 0.01 mm) and then look at the vertical displacement of the rear axle and divide that number by the difference in shock length it gives you appropriate leverage ratio. As the difference in shock length approaches zero, the approximate leverage ratio approaches the actual leverage ratio.
This forum topic has 23 replies.
jma853 Added a reply to @Cascade Components - Homework Help
10/23/2025 10:26pm Yeah, I agree that the drawing isn't great. Unfortunately, I don't have access to the answer key so I can't just reference it to see the work that we are actually expected to do; things will probably be clearer once I talk to the professor about it. It's cool to see the way that leverage ratio is calculated. I'll definitely...
jma853 Added a reply to @Cascade Components - Homework Help
10/23/2025 7:53pm Okay, after I redid it I got the same answer. I'm just as confused as you are as to why the diagram they gave us, which positions the rear axle below the chainstay pivot, is apparently drawn incorrectly according to the answer key. The diagram you sketched is correct according to the answer key, but at this point, I think...
jma853 Added a reply to @Cascade Components - Homework Help
10/23/2025 6:17pm Statics class, but honestly this is a fair question for Physics 1.
jma853 Added a reply to @Cascade Components - Homework Help
10/23/2025 6:16pm Oddly enough, the drawing of the diagram I sent in the first image was wrong - the rear axle should be coincident with the chainstay pivot as per the answer key. The free body diagram I have at the bottom of the page shows the corrected pivot points. Due to rounding errors, my answer came out as -169 but the...
CascadeComponents Liked a reply to forum topic @Cascade Components - Homework Help
10/23/2025 6:11pm
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jma853 Added a reply to @Cascade Components - Homework Help
10/22/2025 11:38pm Anyways, after throwing a bunch of shit at the wall, I got a variety of answers ranging from 150, 178, all the way to like 700-something. I'll probably regroup with my study group tomorrow and try to squeeze into office hours next week.
jma853 Added a reply to @Cascade Components - Homework Help
10/22/2025 11:09pm While I was redoing my work to make it clearer, I realized I made a mistake while taking the moment about the chainstay pivot (literally the first step 😭) For some reason, my forces at the rear axle / seatstay sum to zero.
jma853 Added a reply to @Cascade Components - Homework Help
10/22/2025 10:38pm Ahh, I forgot about the force vector being along the axis that connects the two pinned points. That's my bad. Thanks to your help, I actually have an answer now, which is a significant improvement compared to ~an hour earlier. I didn't expect you to reply at all since I posted this thread half jokingly, but I honestly appreciate it...
jma853 Added a reply to @Cascade Components - Homework Help
10/22/2025 10:02pm Right - so when you say everything is pinned, does that mean that point F only has a force acting vertically against the rider's weight divided by two? (i.e. no Fx and only Fy) If this is true, would this also mean that the shock is only feeling forces along its length?
CascadeComponents Liked a reply to forum topic @Cascade Components - Homework Help
10/22/2025 9:47pm
Start by finding the moment due to rider weight about the chainstay pivot on the front triangle. Since this is static, the sum of the moments about that point must be zero. This will allow you to find the reaction force at the seat stay. Remember since everything is pinned, the force can only be along the axis of that member. Similarly, you can then do a sum of moments about the upper link pivot on the front triangle to find the reaction force at the shock.
This forum topic has 23 replies.
jma853 Started a new thread @Cascade Components - Homework Help
10/22/2025 9:24pm Hi Cascade Components (or anybody else decent at Statics), It would be an honor if you could lend us your linkage expertise in solving this homework assignment. We've been wracking our brains over this for a while and can't figure it out. Thanks 👍
This forum thread has 23 replies.
HexonJuan Liked a reply to forum topic MTB Tech Rumors and Innovation
10/22/2025 1:16pm
Looks like a Ryde Edge series rim. Weird they put a photo with a mangled nipple front n center: I realize that's a bit obsessive, but as a wheel builder this matters.
This forum topic has 30430 replies.
jackyGTR Liked a bike check Santa Cruz Nomad CC Custom Build
10/21/2025 10:34pm
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buggyr333 Liked a bike check Transition BottleRocket
10/21/2025 10:34pm
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