glad I could help
Can you also add the same pulley for 12mm and 15mm belts?
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Yeah I can! I’ll draw those up tomorrow afternoon and post on thingiverse.
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Is there a retainer on the outside for the bolts? I guess I don’t understand how they add support.
Bolts are there for structural integrity I would say. For these type of wheel pulley you need to file down the truck to make room for extra material next to the wheel (it is press fit).
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@Ackmaniac Just updated the thingiverse page with the 12mm and 15mm wide models, if you need any other file formats just ask, or if you want me to modify the design to fit your trucks better. They will probably require supports but I haven’t printed them off myself yet. @SilentException you are correct about the the bolts just being used for supports. Also if you use MBS ATS trucks and 10mm bearings you don’t need to file down the trucks. @Colson003 heres a picture of showing how the screw extends into the hub of the wheel. I decided to do this because the first models sheared off the teeth in a ride (it was printed with PLA and thats probably why). Now with the screws I have 80+ miles on PLA pulleys without any cracks or noticeable wear.
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21.5 would be good 
any chance you can share it as a Step file too?
Hello, I was wondering what motor pulley and belt you used for this project. Thanks!
@Deckoz Sorry brother, I was busy this week!! updated the Thingiverse with a DWG, STL and STEP file of a 21mm version (21.5mm actually). lemme know how it works and if you need any there formats! @ggalisky im currently using a 300 tooth HTD 5M belt, but you should use the calculator here https://sdp-si.com/eStore/CenterDistanceDesigner and you can use your mounts dimensions to decide belt size. I got my 9mm wide motor pulley from someone on here, but you can get them from diy @torqueboards, or others on here. I would opt for a steel motor pulley because the aluminum ones wear down quickly.
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@Deckoz this winter im going to remake it so it works best with the Surfrods RKP trucks, so keep an eye out. And im going to have different tooth sizes, so lemme know If you have a specific number you would want.
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I’m actually planning on using it on syrfrodz rkp 200mm hangars with 80mm axles.
@Deckoz Hell yeah, I just ordered them for the 25% off deal today. But I only saw the 70mm… but that will be plenty even when using sk3 6374motors that are 84mm wide. However with a 21mm pulley you’ll need the extra length
Yeapp. BTW the axles are just class 12.9 shoulder bolts, m8 thread, 10mm shoulder diamter * whatever length. Can get them from fastenal.com
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@Deckoz dope, thanks for the info. I’m just hoping these things don’t bend like my MBS ATS trucks do
Working on some motor mounts for the surf rods 200mm RKP trucks, made for 2 sk3 6374 motors. Heres some CAD porn. If anyone might be interested say something cause I could make a few extra or provide all files when its done. Next step is to 3d print everything and verify that all the sizing is correct (less then a mm between motors, and between the wheel pulleys and mounts)
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@Deckoz I’m going to design a new motor pulley this winter break, do you have any preferences for one? For my mount above I need it to fit closer to the flywheels, and I’m using 192kv motors so I want to use a different gear ratio. Would like to make it be a helpful printable pulley for more people’s builds. What amount of teeth would you be interested in? (I’m thinking somewhere between 41-46)