5" or 6" pneumatic wheels.

psychotiller said:
drmacgyver said:
Pediglide said:
maybe it'll be better to just use the MBS bearing and wrap the axle with a spacer with a bit of loctite inside...?
Click to expand...

Or using the skate bearings you have there, find an aluminum or pvc pipe with a thickness that would fit the gap and shave a ring off the end of the pipe?
Click to expand...


That's exactly what I was thinking. Then also get some washers with 8mm id/ 28mm od to cover/keep the pvc seated. Good Job drmcgyver!
Click to expand...

Thanks! :D The washer would be a nice finishing touch. Sanding the pvc to get it nice and grippy would probably help a layer of loctite red stick (similar to pediglide's original suggestion). If the pvc is a tight enough fit it might not even be necessary.
 
Pediglide said:
No, not red. Loctite red is for metals, it'll eat the plastic. I think Loctite has one specifically for plastics.
Click to expand...

Oh damn, I thought red was just a permanent version of blue. Thanks for the clarification :)
 
Will a hub adapter need to be designed from scratch or are there any other options available?
 
Just went to Home Depot and couldn't find anything that will work. All of the pvc was either 3/4" or 1".
We may need to make spacers. I'm going to put the smackdown on google tonight.
 
torqueboards said:
Just got my set. Will end up getting a new board for this one for more wheel clearance. Too bad no specific bearing available. Will have to see what fits.
Click to expand...

I may do that as well.
 
Psychotiller what bearings are you looking for 8x28x9?

638 ZZ C/3 ABEC3 Bearing 8x28x9,638 Z, USBB Brand (LB)
http://www.ebay.com/itm/638-ZZ-C-3-ABEC3-Bearing-8x28x9-638-Z-USBB-Brand-LB/230928885310?_trksid=p2050601.c100085.m2372&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140211132617%26meid%3D6719851565117397144%26pid%3D100085%26prg%3D20140211132617%26rk%3D1%26rkt%3D4%26sd%3D230928885310%26clkid%3D6719855578864650397&_qi=RTM1562569
 
torqueboards said:
Psychotiller what bearings are you looking for 8x28x9?

638 ZZ C/3 ABEC3 Bearing 8x28x9,638 Z, USBB Brand (LB)
http://www.ebay.com/itm/638-ZZ-C-3-ABEC3-Bearing-8x28x9-638-Z-USBB-Brand-LB/230928885310?_trksid=p2050601.c100085.m2372&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140211132617%26meid%3D6719851565117397144%26pid%3D100085%26prg%3D20140211132617%26rk%3D1%26rkt%3D4%26sd%3D230928885310%26clkid%3D6719855578864650397&_qi=RTM1562569
Click to expand...

Yeah, I saw those and that would be the size, But I was hoping to do better than abec 3. Are you going to order these? I think this may be the only bearing supplier shipping from the states...
 
psychotiller said:
torqueboards said:
I got those ABEC3 ones just to have. Yeah, would be nice to make a spacer like that. Most likely wouldn't be feasible though for just us lol. I'm not that talented yet to do it by myself. Can you do it?
Click to expand...

I could have them made but it would be $200 for enough for the 2 of us...Kind of ridiculous.

I found another US supplier for Bearings:
http://www.avidrc.com/product/1/bearings/724/8x28x9-Metal-638ZZ-bearings.html?cc=1
Click to expand...

Yeah LOL. I might be able to get them made for cheaper than $200 but IMO anything over $50 is too expensive lol. We would need 8 of those things too.

I like the cheaper solution lol. Those are nice $8 total w/ shipping in US. Are you getting those? I might just get these too.
 
torqueboards said:
Is there room on the axle to fit the 9mm width of the two bearings. Original is 7mm that's extra 2mm is 4mm extra on each. Can you still get a few threads on the nut?
Click to expand...

Yeah it should be fine
 
Messed around with the pulley today. I tried to used collar nuts throughout the process hoping to not have to drill through the spokes but I wasn't able to get it quite right...May still just drill a few holes. The one good thing though was that the 9mm pulley is going to center up perfect on these randalls.

View attachment 1

2014-05-07 18.33.19.jpg
 
Cool. Can't wait to get mine in. Should be on it's way. Do you think the 44T on that pulley is good for the gearing ratio of that wheel? I wouldn't be surprised if more people buy these 6" pneumatic tires soon.

Why wasn't it fitting right? Is it due to the holes on that pulley that you have? Would be nice if they fit lol. I actually only designed those for ABEC 11 Flywheels.

For mine, I'm probably going to 3D print a hub centric adapter and use a few different polycarbonate pulley wheels in different sizes. 158mm tire, 280kv 50mm SK3 motor, 6S, 40T/16T would be about 40 to 44mph. Although, not sure how the starting torque will be. Will definitely have to try it out. If not a 45/50T perhaps.
 
If you guys can crack this and get good results on the road, make sure you post a follow up with parts/prices. I'm watching this thread like a hawk. lol. :shock:
 
This is what I was going to roll with for now. Do you think it wont pull enough? 35mph or there-abouts doesn't seem so bad right?

Voltage 22.2 / Motor RPM 5439
Motor KV 245 / Distance rolled/one revolution 0.47728
Wheel Size 158 / Meters per minute 2595.92592
Motor Pulley 17 / Meters per hour 155.7555552
Wheel Pulley 44 / Miles per hour 96.7819850902
Circumference of wheel 477.28
Gear Ratio 2.5882352941
MPH TOP SPEED 38
 
torqueboards said:
Cool. Can't wait to get mine in. Should be on it's way. Do you think the 44T on that pulley is good for the gearing ratio of that wheel? I wouldn't be surprised if more people buy these 6" pneumatic tires soon.

Why wasn't it fitting right? Is it due to the holes on that pulley that you have? Would be nice if they fit lol. I actually only designed those for ABEC 11 Flywheels.

For mine, I'm probably going to 3D print a hub centric adapter and use a few different polycarbonate pulley wheels in different sizes. 158mm tire, 280kv 50mm SK3 motor, 6S, 40T/16T would be about 40 to 44mph. Although, not sure how the starting torque will be. Will definitely have to try it out. If not a 45/50T perhaps.
Click to expand...

The 44 I bought from you has 6 holes and the wheel has eight spokes (holes in larger pattern as well)
I used a a big washer and drilled 3 holes for the pulley and 4 holes for the wheel. I put some barrel nuts between the spokes and screwed it all together with 6mm hardware.

Think its gonna work! I got it all centered up. Cost 4 bucks in hardware.

*the wheels have a large hole for the valve stem allowing the tube to bubble though...I bought a few rubber washers to put around the valve stem inside the hubs. That closed the gap.
 
I received the 8x28x9 bearings today and they seem to be a little sloppy fitting...Weird because I have some 10x28x9 bearings that fit perfectly :roll:
 
psychotiller said:
I received the 8x28x9 bearings today and they seem to be a little sloppy fitting...Weird because I have some 10x28x9 bearings that fit perfectly :roll:
Click to expand...

What's messed up about the new bearings? I bought some other bearings on ebay too. I'll see which ones are better. Wondering when I'll receive my wheels.
 
torqueboards said:
psychotiller said:
I received the 8x28x9 bearings today and they seem to be a little sloppy fitting...Weird because I have some 10x28x9 bearings that fit perfectly :roll:
Click to expand...

What's messed up about the new bearings? I bought some other bearings on ebay too. I'll see which ones are better. Wondering when I'll receive my wheels.
Click to expand...

They fit too loosely. Guess I could tape them but I would rather have a perfect fit.
 
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