I wonder if thane builds are more prone to this due to the amount of vibration experienced vs penumies.
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ok, i see.
hope that they get this completely sorted out 
personally I ride S10 trucks, because i like their looseness and missing rebound.
so this yumas are maybe something for me 
Seems likely, but I was on mad wheels, traditional thane might be even harder on the cam.
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Jumaās customer support is top notch.
I just got the package they sent me, steel cam and prototype rebound adapters!
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So, like @Avi i got the prototype rebound adapters as well. Took them out for a 18 mile ride and it felt much better relative to your traditional trucks. I generally ride Krank riptide bushings so am used to high rebound, and this was closer to that feeling. Only one duro right now as these are prototypes.
Downside of my ride today is that I thought maybe by moving the arms in Iād put them into ācarvyā mode. But seems they were already in that mode, because my feet are sore from trying to turn. The ride was stable af at speed though.
I need to move the arm thingies back, and print the recommended +10-15 degree riser to try and get more turn out of these. I think itās the no rebound aspect of the trucks which make them feel loose and initiate turns easily, but in terms of actual turning angle not much right now.
Hereās in stable mode, and Iām 200lbs:
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The lack of turning with rebound adapter is because the bushing gets caught and canāt compress any more. Juma is looking into alternative designs for the bushings to address the issue.
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@zero_ads From my conversation with Juma.
Regarding caster, dropping the angle will give you more steering per degree of lean, but thereās a tradeoff with high-speed stability.
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I havenāt gotten to ride them much this week due to the new puppy, but right after I put them on I did a night ride where my average speed was 9kph faster usual. Lots of fun.
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Yeah this all makes sense, but even without rebound I was surprised by how wide I had to make u turns vs my RKPs. Hoping more angle will help with tighter turns, but not so sure because of the rebound adapter as youāve pointed out. And I wouldnāt ride without the rebound.
This is also why I mention duro, given a choice Iād go with a softer one.
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Regarding caster, dropping the angle will give you more steering per degree of lean, but thereās a tradeoff with high-speed stability.
If I understand the quote correctly increasing caster improves stability but decreases turn per degree of lean. This is the opposite of most of the trucks we use.
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Just curious:
wouldnāt springs be perfect for this?
Something like the springs from seismic maybe?
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Thatās a good idea, only thing is from what Iāve seen itād be difficult to hold the spring in place.
What about mounting the bottom of a spring to outer chassis bolt.
I think they need a pretty thorough re design, the rebound should be on springs and the minimum angle for the trucks should be built in.
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Agreed, weāre starting to approach the point where all these afterthought attachments really mean the original design wasnāt enough.
I could see that working.
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the design is basically is begging for a channel truck spring setup
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I disagree about the minimum angle being built in. I prefer them lower profile, that way you. Can choose a minimum angle. Perhaps the rebound adapters could be built in or built with an angle in the next version.
Iām not convinced a redesign is needed. I suspect with a few more prototypes rebound will be solved. In future versions my guess is rebound will be build in, but I really donāt think this version canāt work just as well with the right adapter setup.
I guess if you want something done right you have to do it yourself lol
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Crazy stupid idea what if we used tension springs instead of compression springs?