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Allen_okc
13 April 2012, 0807
:o Since the cat got out of the bike bag - i am pleased to announce the next creation...

I've always had a fascination with the hubless motorcycles - of course this bike will be scratch built frame up build.

I want the springer forks which have to be scratch built - fiberglass body - PM motor with direct gear drive to the rear hubless wheel - the battery box will be similar to the one on my EV chopper, but two cells longer and lower profile - the frame custom built - wider tire rear, narrow pizza cutter hubless wheel up front...

this project is at the material collecting stage and dimension stage...

this video is a good example of what i want to build...


http://www.youtube.com/watch?v=yJPTSaARlvs

:cool: got all summer to ride the 72 volt chopper, got all winter to build the hubless chopper...

Hugues
13 April 2012, 1011
awesome !

I have just started my build and now you give me another idea !
The hubless wheel look great ! ALthough i have a preference for the rear one. The one in front, well, not sure.

But tell me, mechanically, how do they perform compare to traditional drive with chain or belt ? And can you give me a pointer on a good page where they show how they work, especially the drive part for the rear wheel, i'm really interested. And how is the break working ? Are they noisy, compared to a chain drive ? Can you use regen ?

so many questions.....

thanks for the cool ideas !

Allen_okc
13 April 2012, 1043
no problem Bro - fabricating a hubless isnt that far out of reach...


http://www.youtube.com/watch?v=5VxrMK8huEU&feature=related

an exploded view of a typical hubless...


http://www.youtube.com/watch?v=CdPsrU1eiHo

Hugues
13 April 2012, 1201
cool !
thanks

but did i hear the guy say "10'000 USD ball bearing" :O ?? where are you planning to get your ball bearing ?

with such a large diameter sprocket at the back, you think one could reach 6:1 ratio with a belt ?

Allen_okc
13 April 2012, 1231
my girlfriend runs a CNC here in the city and they make bearings - but i would look at the wrecking yards for the car parts - "roller bearings"...

Zachary Rubin
13 April 2012, 1242
where are you planning to get your ball bearing ?


my girlfriend runs a CNC here in the city and they make bearings

forget the ball bearing, where do you get a girlfriend that runs a CNC??

jk dude i look forward to hearing how the build progresses

billmi
13 April 2012, 1433
But tell me, mechanically, how do they perform compare to traditional drive with chain or belt ?

There are times when awesomeness trumps performance and efficiency.

I believe this is one of those times.

liveforphysics
13 April 2012, 1525
The "hubless" wheel in the video is not hubless at all, it just has a much larger than makes sense hole running through it than a standard hub.

The ball surface speed on those bearings leads to high friction and low life.