Cheap Ass 6x2 Pneumatic Belt Setup. 3D printed Pulley/ Vex Versa Pulley. Thingiverse link in post #534

murloc992 · February 10, 2019, 2:32pm

I grabbed them in a local hardware store called Ignera in Vilnius, Lithuania if that helps a little.

I think you could find them online, like on amazon, just search for CRAFT 628RS bearings. I guess…

Benjamin899 · February 10, 2019, 2:34pm

or you dismantle the stock bearings, clean them with alcohol and lubricate them with oil or grease

murloc992 · February 10, 2019, 2:35pm

They still felt uneven, some of them were even getting caught up with something and locking up from time to time. Bad bearings.

mishrasubhransu · February 10, 2019, 4:22pm

I wonder what the efficiency is because of the pulleys.

murloc992 · February 10, 2019, 4:23pm

Yeah, long mount, with a short one I’d hit the tire with the pulley no problem…

murloc992 · February 10, 2019, 4:25pm

I assume by pulleys you mean idlers.

I doubt it really will impact much(reducing range, etc) as these add minimal pressure and allow me to run loose belts… They are equipped with bearings anyways, add just tension and minimal angle to the belt travel path.

I’ve found this too:

Read a bit more in that thread, it’s a nice thread.

Mich21050 · February 10, 2019, 4:36pm

NVM— solved

mishrasubhransu · February 10, 2019, 10:56pm

So @dickyho has an airless offroad setup now that is priced crazy well. He is going to be selling pneumatics ones too. So, do check it out. Here’s theebay link.

Here is his thread

mishrasubhransu · February 11, 2019, 7:13pm

I confirm that the uphill consumption is 15wh/km. That’s puts the average of uphill and downhill at around 13wh/km. I am impressed. This is on stock bearings. Screenshot_20190210-154856 Screenshot_20190210-154844

murloc992 · February 11, 2019, 7:14pm

Frickin insane. I want to ride asap. But there’s like, two more months left to wait for the snow to thaw…

Bjork3n · February 11, 2019, 7:28pm

That’s really good! My wheels will arrive this week, I’m super excited

deucesdown · February 12, 2019, 12:31am

This is for the airless?

mishrasubhransu · February 12, 2019, 12:34am

No no, this is for the pneumatic tires. My setup.

Bataleon · February 12, 2019, 5:13pm

13Wh per km is super good efficiency for pneumatics. What PSI do you run them at?

Also, has anybody else had quality control issues with the 6x2 inner tubes? Two have already failed on me where the valve stem meets to tire

mishrasubhransu · February 12, 2019, 5:17pm

Put a 2 star review on Ali with the photos of the defect and they will send you new ones.

I run them at 72 psi

amazingdave · February 12, 2019, 5:28pm

Yep I’ve had that failure on one so far.

Benjamin899 · February 12, 2019, 5:52pm

me too…tried to fix it but that area is impossible to repair.

Bataleon · February 12, 2019, 6:03pm

I managed to fix one using an adhesive called Pratley’s Wondafix.

I partly removed the valve stem and injected some between the side of the stem and the tube which had come loose. I then put a small cable tie around it tightly and left overnight. It’s been holding up well so far (30 PSI so nothing crazy).

Probably not worth the effort but finding a replacement inner tube locally was impossible.

mishrasubhransu · February 12, 2019, 6:07pm

I am surprised you didn’t get 2 spare tires with inner tube. Inner tube should outlast the tires, so even if you get one defective you are still all set.

I had one defective stem out of 8 full tires and 8 tire-tube set. I messaged the shop with photos in Ali Express and they sent me 2 two replacement tubes for free.

Bataleon · February 12, 2019, 6:10pm

I’ve since got two spare tires + inner tubes which should last me a while I would’ve pushed for replacements from the same store if I’d known.