ryoung90

Hey guys,
I just wanted to get some feed back from ya'll.
What do you guys think about a 6Teeth hub bike.
The pro's and the con's

lz4005

Con: what is a 6teeth hub bike?

gavtatu

do you mean a teeny tiny sprocket ?
a `sprocklet` if you will !

StephenH

You may have a situation where if the rotational speed is constant, the chain speed won't be, or vice-versa. That would happen with more teeth, too, but would be more noticeable with fewer teeth.

Increased wear would be an issue.

If you just want super-high gearing, that's traditionally been done with a giant front ring, rather than a teensy rear sprocket. Or in some cases, a jackshaft in between.

The sprocket has to fit on a wheel of somekind, and that might limit the minimum size.

krome

Skip tooth cog? Equivalent to a 12 tooth normal cog.

Doug5150

I would guess that is what OP meant? Grind off every other tooth....

While its certainly possible to do, and I think it would still function (if done properly) it wouldn't be very noticeable.

--------

At another time and place the discussion turned to customized bikes and polygonal sprockets. From that the concept of "Pants-Eater, the biggest 14-tooth cog in the world" was born. (pic below)

I never bothered to cut one tho', so I don't know how well it would really work.
The chainline is correct however, and it would be equivalent to a 42-tooth sprocket.

ryoung90

Yes, I made the front sprocket into a 16 Teeth and the rear into 6 Teeth.

Flying Merkel

Thanks for the video, but how about one taken from the drive side?

Mr Danw

...or one of the bike in use.

ryoung90

Sure, I'm making a cover for the chain. After i'm done i'll take a picture and also upload a video of the bike in use, A.s.a.p.

Leebo

The point is?

ryoung90

Are you from Electra ? I used to live in Costa Mesa

ryoung90

Lightness = Speed

LesterOfPuppets

Weight-weenieing cogs on a bike with a kickstand????

whitefiretiger

quite interesting. i like the meniture drive chain idea and had thoughts of this but wanted it to work on more than a ss so i never bothered.
if this is done correctly you could still get a good gtear ratio tho.

whitefiretiger

id like to see it without the chain guard and see a video of it riding around.

also would like to see this applied to a larger bike.

ryoung90

Sorry I can't open the cover until I get the patent number. I just uploaded a video of the bike in use.
I'll try to make one using a larger bike, but I'm a refrigeration mechanic so i'm quite busy. When i'm free I'll try to make it.

whitefiretiger

i think if you get this to work on a large bike that would make big news.

next step after that id say would be making a multi speed version. weight weenies everywhere would go nuts.

how does the new setup compair to a terditional bmx type bike gearing? that style bike standard usaly 42/18 or something close i think.

ryoung90

I made a 6teeth rear and 16teeth front sprocket but when I tested the bike it was faster then I expected. So I counted the front sprocket teeth and it was 17teeth, I originally ordered 16teeth but received a 17teeth sprocket. I didn't even notice it til later.

whitefiretiger

interesting. how does it perform tho compaired to conventional gearing. starting trom stand still, flats, up/down hill. is it about the same or easier or harder.

ryoung90

Sorry i'm not a scientist but I believe if you extend the pedal arm or shorten it would be easier or harder. It doesn't matter about the size of the sprocket as long as its a same gear factor it needs the same input power, That's my guess.

whitefiretiger

not quite. keeping the same gear ratio is key in a way but the other thing is you greatly changes the rotational mass which will have a major impact on the ride.

example would be i hade a single speed bike that came with crazy big gears (the bike that had me thinking along the lines of what you did)

came with 54/23 when i got it. 2.347:1 ratio
switched to 42/18 2.333:1 ratio
switched to 38/16 2.375:1 ratio
switched to 34/14 2.428:1 ratio

the smaller gears having basically the same ratio as the original large gears didn't travel the same. i found myself needing to increase the ratio to keep the original ride-ability

i went with 36/14 2.571:1 ratio in the end to have close to the original all around ride-ability as the original gearing did.

i stopped at 14t rear as was the smallest i had.

i find myself thinking about your 17/6 2.833:1 ratio seems like youd never get anyplace that way. that would be like riding 42/15 in terditional gearing. that would not be the most plesent to ride on anything but down hill but once again the lack of rotional mass may have altered the desired ratio. if you were trying to have a normal single speed ratio 14/6 would have been the way to go assuming the desired ratio isnt tossed to the wind the tiny gears.

ryoung90

The original set up I had was 44T front and 16T rear. It was hard to start , but when going was ok. The pedals still seemed stiff.With my new setup the tension was allot less and the ride was smoother.I calculated the old set up 44/16=2.75 and the new 17/6=2.83,which is higher than before,but the new setup is still easier to use.There is a way I set up the chain and sprocket that may increases torque transfer.

whitefiretiger

ok i was wondering if the overall size would affect the ride and it sounds as it has. keep up the work.

ryoung90

I recently made a 26" Wheel Big bike, Here is my Blog. www.texasrodeobike.blogspot.com
Check it out.