19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)

I want to drill my prowheel rim to reduce weight. Do any of you see any issues with drilling holes in the locations I circled in red?

Where I marked in yellow looks to be a a lip that the tire rests on, is there any issues drilling into this?

If anyone has a better idea on how to drill the holes please share.

Thanks.


 
Offroader said:
I want to drill my prowheel rim to reduce weight. Do any of you see any issues with drilling holes in the locations I circled in red?

Where I marked in yellow looks to be a a lip that the tire rests on, is there any issues drilling into this?

If anyone has a better idea on how to drill the holes please share.

Thanks.


[
rim%20drilling_zpshkgvqumu.jpg
[/url]
Click to expand...

I think you will be okay, just have lots of tape on hand to cover the holes up so your tube doesn't get cut. With those many holes drilled like that, you may loose more than 7-8 oz.
 
Rix said:
kiwiev said:
just a quick photo with 19" rear and 26" front wheel.

Cheers Kiwi
Click to expand...

Looks awesome amigo. You going to go with that combo?
Click to expand...


For a start Rix but I would like to try my 24" front wheel off my black vector.

Did you try a 26" and 24" wheel on the front with 19" on the rear and was there much difference?


Cheersj Kiwi
 
Offroader said:
I want to drill my prowheel rim to reduce weight. Do any of you see any issues with drilling holes in the locations I circled in red?

Where I marked in yellow looks to be a a lip that the tire rests on, is there any issues drilling into this?

If anyone has a better idea on how to drill the holes please share.

Thanks.


Click to expand...


not worth that work/weight + we all know you are the hardest ebike killer here..... :mrgreen:
so dont wonder if you kill another rim. atm i would prefer a better rear shock with more rebound for the 17kg wheel.
 
Merlin said:
Offroader said:
I want to drill my prowheel rim to reduce weight. Do any of you see any issues with drilling holes in the locations I circled in red?


not worth that work/weight + we all know you are the hardest ebike killer here..... :mrgreen:
so dont wonder if you kill another rim. atm i would prefer a better rear shock with more rebound for the 17kg wheel.
Click to expand...
Click to expand...

I didn't think it was either. But with the hole pattern Offroader is suggesting, might be able to take out more than 7oz. If I could loose a full pound (.45kg) and not sacrifice strength, this could be the hot set up.
 
The rim I want to try it out got warped when I fell into a hole and broke like fourteen 12 gauge spokes. It is slightly bent in at one point and can't be trued. So I can test it out first before doing it on a good rim.

People drill out their fat bike rims all the time without what seems little issue. They almost completely remove the center of the rim. I don't think I am going to go so aggressively as them.


drilled+100mm+wheels.jpg


These prowheel rims are really thick and heavy, built probably not to fail when hitting a pothole at 80MPH on a 500 lbs bike. Our light ebikes will never have anywhere near those stresses, especially with our 8-10 inch travel rears.

But who knows but someone has to test it. We have to put more work on making some of these components lighter. Like the hub motors need to be built lighter as they are built way too heavy, we need ebike specific tires that are stronger than bicycle tires but not as heavy as a motorcycle tire.
 
Offroader said:
The rim I want to try it out got warped when I fell into a hole and broke like fourteen 12 gauge spokes. It is slightly bent in at one point and can't be trued. So I can test it out first before doing it on a good rim.

People drill out their fat bike rims all the time without what seems little issue. They almost completely remove the center of the rim. I don't think I am going to go so aggressively as them.


[These prowheel rims are really thick and heavy, built probably not to fail when hitting a pothole at 80MPH on a 500 lbs bike. Our light ebikes will never have anywhere near those stresses, especially with our 8-10 inch travel rears.

But who knows but someone has to test it. We have to put more work on making some of these components lighter. Like the hub motors need to be built lighter as they are built way too heavy, we need ebike specific tires that are stronger than bicycle tires but not as heavy as a motorcycle tire.
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I am following this closely. When I tried this myself, I wasn't aggressive at all with the amount of material removed. I know how you ride, if you can loose a pound, and you don't have any structural failures, then I will probably do the same.
 
Here you go Rix

can't wait for a ride I think it looks cool 8) 8) 8)

Cheers Kiwi
 

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kiwiev said:
Here you go Rix

can't wait for a ride I think it looks cool

Cheers Kiwi
Click to expand...

Damn, that does look cool, its times like this I wish I was independently wealthy so I could fly to where you are at, just to get a test ride in. Call it a hunch, but I think you will be really happy with your build. BTW, next time you and Blake get together and make a vid, I would like to see some close up footage of this machine running the same terrain as CD's machine, for comparison reasons of course. Again, very nice build. Looks tough as shit.
 
So I gave the Mxus a work out did a 8 km hill climb and about 1200 ft with some mates on Quad bikes. :D

the results: :idea:

-Awesome :D
-torque :D
-heat I could still hold my finger on the hub for about 10 seconds with out burning

The bike blew away the quads easily :mrgreen:

with 19" rear 24" front the bike was very balanced.

Cheers Kiwi

BTW youtube shagged the quality even when I uploaded in HD :twisted: :twisted:

This Video is for you Rix not quite as good as CD :|

[youtube]PfI9XVLRbUY[/youtube]
 
kiwiev said:
So I gave the Mxus a work out did a 8 km hill climb and about 1200 ft with some mates on Quad bikes. :D

the results: :idea:

-Awesome :D
-torque :D
-heat I could still hold my finger on the hub for about 10 seconds with out burning

The bike blew away the quads easily :mrgreen:

with 19" rear 24" front the bike was very balanced.

Cheers Kiwi

BTW youtube shagged the quality even when I uploaded in HD :twisted: :twisted:

This Video is for you Rix not quite as good as CD :|

[youtube]PfI9XVLRbUY[/youtube]
Click to expand...

Nice to hear the mxus has some torque. What winding speed are you using a 4T?

What is the model rear tire you are using?
 
kiwiev said:
So I gave the Mxus a work out did a 8 km hill climb and about 1200 ft with some mates on Quad bikes. :D

the results: :idea:

-Awesome :D
-torque :D
-heat I could still hold my finger on the hub for about 10 seconds with out burning

The bike blew away the quads easily :mrgreen:

with 19" rear 24" front the bike was very balanced.

Cheers Kiwi

BTW youtube shagged the quality even when I uploaded in HD :twisted: :twisted:

This Video is for you Rix not quite as good as CD :|

youtube]
Click to expand...

Thanks Kiwi for making the video with the different camera angles. I was very curious about how your set up would work, which needless to say, is working awesome. Looks like the suspension is dialed good for your weight, the rear was tracking the ground perfectly and it didn't want to you kick the ass end up. You got it set up nice. Front looks good to, could be a hair quick, that could be the video also, but if you front end is sticking in the corners, thats perfect for small bump compliance. Did you vent your hub?
 
Hub isn't vented. I shot 5ml of ferrofluid inside instead before shipping it.
 
Well in the real world I climbed 1200 ft and 5 miles averaging 20 to 30 mph with quad bikes and didn't cook the hub. I don't know what it would have been like without the oil but the hub gets warm faster but after that ride I could still hold my bare hand on the hub for a good minute.

Maybe Sam can shead more light. Btw I went for a 15 mile single track ride today the track by the lake Cowardly duck and I did Rix and it only got warm.

Cheers Kiwi
 
Rix, I run as low as 11-12 PSI without any slippage. Actually the tire bonds so tightly to the rim that even when fully deflated I need to break the bead. Our bikes just don't have the power to twist that tire on the rim.
 
Offroader said:
Rix, I run as low as 11-12 PSI without any slippage. Actually the tire bonds so tightly to the rim that even when fully deflated I need to break the bead. Our bikes just don't have the power to twist that tire on the rim.
Click to expand...

I was running what I believed was about 15PSI. It was lower than normal because I was riding up in Idaho and it was wet, and Idaho has almost zero rocks unlike Nevada :D . Long story short, after several shallow creek crossings, I was on the throttle over some very choppy terrain and my tire just went flat. I pushed my bike 2/3 mile or so back to the truck up hill :x and that was all she wrote. Here is what I think happened. 1st I was running the tire too low of PSI for my weight which was then about 260# at the time. 2nd the conditions were post rain wet, the ground and grass were wet, and the creeks crossing were numerous. I think water from the crossing got between the bead and tire due to the the low PSI I I was running. 3rd when I was on the gas through the woops, the rear wheel was hopping alot, so when the wheel was off the ground it spun faster than hit the ground and caught. I think with these conditions combined, cause my tire to slip a little on the bead which tore the valve stem from the tube. To further support my theory, when I got back to Pop's house and removed the tube, there was tear on one side of the valve stem base where it intersects with the tube and I couldn't find any puncture holes. Of course I couldn't inflate the tire and put in water to see if there were bubbles, but I looked closely and didn't see any puncture holes. If there is another theory, I am glad to hear it, but I believe I flatted because the tire slipped on the rim just enough to pull on the valve stem and partially torn it.
 
Spin, I wondered what you were using to clamp the dropout slot. Cable clamps with allthread?
 
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