Opposite of the heavy side
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lol, that’s obvious, but I meant inside of the rim, outside, middle. Where is the best place to place it so it doesn’t fall off or get knocked off etc.
Doesn’t matter IMO. I’ve been putting mine both on the inner and the outer rim and haven’t noticed any difference.
Regarding gear drive, best to take the wheel off and put it on the front truck for balancing. Or maybe if you just flip it over on the rear truck that should do the trick as well.
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First test. The print came out pretty well. I used M3x8 bolts as weights. They just sink in without coming out of the other end. They are basically drilled in (the holes are 2.5mm) and I think they might hold in even without being secured with a nut. We’ll see after some riding. Not using the nuts makes the installation faster and more hassle free.
Fits snugly! Yay.
Balancing test. This is without any counter-weight at all. Lot of pendulum effect.
This is my best effort in in getting the wheel balanced by adding the bolts only. Unfortunately (as I expected), the bolts don’t add enough weight to counter-balance the valve. Still, they do help a lot. The pendulum effect is much reduced.
Last I put just one 5g weight to counter-balance the valve. I then used the bolts to finetune the balancing. This worked perfectly.
Looks promising so far. Here are the STL and STEP files if anyone wants to play with it.
weights_holder_for_Trampa_wheels.stl (324.1 KB)
weights_holder_for_Trampa_wheels.step (772.7 KB)
I printed from PETG with 5 perimeters and 15% infill (there’s almost no infill though so the infill percentage doesn’t matter too much).
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That’s some clever thinking! I like it!
Might it make enough of a difference if its thickness was reduced around the valve side, I wonder?
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It would probably shave off a gram or two which is not a lot but it’s not insignificant either. It’s a good idea. Then again I have some wheels where (strangely) I needed to put more weight on the valve side to get them balanced.
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This science deserves to be in its own thread Jan, beautiful work 
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yeah thts a nice idea
i just ordered counter weights to balance my 9" mud pluggers on my etoxx offset hubs (i think the valve makes the wobble)
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Incredible! Great work bro, definitely following progress on this
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Genius! What a great idea. Could you estimate the weight of the valve stem and add spots for one or two larger bolts of similar weight across from the stem to offset the weight, and use the smaller bolts for fine tuning? And make these for MBS Rockstar and 5 stars? Pleeaase??
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The bigger bolts spots are a good idea. I’m thinking one big hole on each side of the spoke opposite the valve.
Unfortunately I don’t have any MBS wheels on hand. Also I think making something that could be easily attached to the Rockstar/Fivestar hubs would be more challenging since the bolts that hold the two parts together don’t stick out.
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Here’s another iteration. I removed material from the valve side and added two slots for M5 bolts opposite to the valve.
M5x6 bolts should sink in perfectly. Or maybe use M5x10 and a nut for safety and extra weight. I’ll get it printed, test it and report back.
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Pro or 2?
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2 is more widely used
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I know I have fivestars laying around, I think I have a rockstar 2 as well. I’ll be back.
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A laser cut version could be mass-produced pretty easily and sold on here, I wouldn’t try that though cuz this is your idea
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Was about to ask why not add a second and a third row of m3 bolts inside the ring ?
It’s an option but I don’t think it’s necessary. I want to keep the volume of the added material reasonable. The holder already adds 10 grams to the wheel which is the worth of two typical adhesive counter-balance weights.
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