Spare Parts
For non-modeling topics and those without a home elsewhere.
Cool bicycle
RobinNilsson
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Posted: Monday, December 24, 2018 - 07:34 AM UTC
Me wants one ...

KoSprueOne
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Posted: Monday, December 24, 2018 - 09:32 AM UTC
What the? Interesting. What is the driving mechanism?




Scarred
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Posted: Monday, December 24, 2018 - 11:49 AM UTC
Too cool to ride. Or do you fly it?
RobinNilsson
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Posted: Monday, December 24, 2018 - 11:51 AM UTC
Gears. Toothed ring carrying the pedals and then one or more gears (uneven number) to carry the rotation over to the rear wheel. It looks as if the rear wheel has some shine objects on the centerline. Two tyres side by side with a toothed ring sandwiched between them???
I wonder how well it stands up to dirt getting in the gears ....
/ Robin
sgtreef
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Posted: Friday, December 28, 2018 - 12:26 AM UTC
Way cool have you seen the motorcycle like this?
Some dude in Brazil built one, low rider at that.
No spokes,and a crap bunch of power.

Think you are right Robin ,no off roading on that bike.
RobinNilsson
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Posted: Friday, December 28, 2018 - 01:01 AM UTC
Can't remember seeing that motorbike.
Link to images or something?
/ Roin
sgtreef
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Posted: Friday, December 28, 2018 - 02:07 AM UTC

Quoted Text

Can't remember seeing that motorbike.
Link to images or something?
/ Roin



I am looking for it,actually I think Bravo posted it.

https://www.youtube.com/watch?v=ciBR4Dwu9Qg

Just have to watch that butt area,and a good chick picker upper, if one can find out where to put one.

Enjoy
petbat
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Posted: Saturday, December 29, 2018 - 09:01 AM UTC
Single fixed gear, no brake lever so likely direct drive with no neutral cruising and back pedalling brakes..... I'll keep my old daily ride Focus for my trips to work and back. 60km's per day up, and down hills, on that one would kill me Robin.
RobinNilsson
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Posted: Saturday, December 29, 2018 - 09:15 AM UTC

Quoted Text


Quoted Text

Can't remember seeing that motorbike.
Link to images or something?
/ Roin



I am looking for it,actually I think Bravo posted it.

https://www.youtube.com/watch?v=ciBR4Dwu9Qg

Just have to watch that butt area,and a good chick picker upper, if one can find out where to put one.

Enjoy



Ooohhhh! That's one cool bike!
Totally impractical of course but that is not the purpose either
Thanks for the link!
/ Robin
RobinNilsson
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Posted: Saturday, December 29, 2018 - 09:22 AM UTC

Quoted Text

Single fixed gear, no brake lever so likely direct drive with no neutral cruising and back pedalling brakes..... I'll keep my old daily ride Focus for my trips to work and back. 60km's per day up, and down hills, on that one would kill me Robin.



I think you are right about the conclusion of that analysis.
2 x 30 kms each day requires a good saddle ....

There might still be brakes on it though. Look at the first image, there are dark sections on the front of the handles.
They do not seem to be firmly connected to the rest of the handlebar, gaps visible all around, so they could possible be brake handles. The brakes themselves could be incorporated the things that grip the rims.

I do think that bike looks a lot better than a Focus though but looks isn't everything ...

/ Robin
18Bravo
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Posted: Saturday, December 29, 2018 - 12:53 PM UTC
I don't know if I posted the above link or not, but probably did, as I build custom bikes myself. As an Indian owner, I like this one:



Hubless motorcycles have been around for years but the first ones had issues with bearings. There is indeed a hub - it's what looks like the wheel. Another hidden wheel with tire rotates around it, and therein lies the problem: The bearings are rotating a lot faster than on a traditional hub and have a tendency to burn up. The problem nay have been solved with ceramic bearings - I don't know. But cool stuff indeed.

The first hubless bike I ever saw was driven with a hidden rubber wheel rotating against the rear tire. Pretty cool in its day, but relatively slow as well.
petbat
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Posted: Saturday, December 29, 2018 - 07:17 PM UTC

Quoted Text


There might still be brakes on it though. Look at the first image, there are dark sections on the front of the handles.
They do not seem to be firmly connected to the rest of the handlebar, gaps visible all around, so they could possible be brake handles. The brakes themselves could be incorporated the things that grip the rims.

/ Robin



No where for the cable to run to the rear. Internally the diagonal at the neck would bend it. If electronic, it would need a battery... Just thinking
RobinNilsson
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Posted: Saturday, December 29, 2018 - 09:30 PM UTC

Quoted Text


Quoted Text


There might still be brakes on it though. Look at the first image, there are dark sections on the front of the handles.
They do not seem to be firmly connected to the rest of the handlebar, gaps visible all around, so they could possible be brake handles. The brakes themselves could be incorporated the things that grip the rims.

/ Robin



No where for the cable to run to the rear. Internally the diagonal at the neck would bend it. If electronic, it would need a battery... Just thinking



Maybe this type:
https://www.bikeradar.com/news/article/worlds-first-wireless-electronic-bicycle-brake-32064/
"There's no brake lever; instead, the rider squeezes the right-hand handlebar grip and a pressure sensor underneath the rubber converts this into a digital, wireless signal. A unit on the fork receives the signal and an actuator works the disc brake. The harder the grip is squeezed, the more firmly the brake is applied."

There are also electric gear shifters for bicycles:
https://en.wikipedia.org/wiki/Electronic_gear-shifting_system
/ Robin
18Bravo
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Posted: Sunday, December 30, 2018 - 03:17 AM UTC

Quoted Text


No where for the cable to run to the rear. Internally the diagonal at the neck would bend it. If electronic, it would need a battery... Just thinking



Never underestimate the ability of a builder to hide things. Cables are very easy to hide anyway, and you'd be surprised how much they can be bent. They can also be stripped in the middle and small pulleys can be used to make them go around more than 90 degree bends.
in 2015, Tour de France riders may have cheated using hidden electric motors. If you can hide an electric motor you can hide damned near anything. I routinely hide batteries on cafe motorcycles, and even though the newest generation are very small, they're larger than an electric motor.
I've been fiddling on bikes (motorcycles) since the early 80's, but on my very first ground up I hid all the wiring the rear brake line, and would have hidden the front brake line in the forks had the guy I commissioned to build the forks not @#*!! them up. There was in internal metal line for the fluid which he did not weld properly, and it kept leaking into the fork tube so that I never had good pressure. Battery is not hidden in the truest sense - it's in the ammo can, but all of the electrics are in the can as well.





Hidden battery on this carbon fiber/titanium bike, which started out just like the one behind it. I'm not finished yet, but the point is, you can definitely hide things in a bicycle if you can hide them on a motorcycle.



And of course this carries over nicely into model building...




KoSprueOne
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Posted: Tuesday, January 01, 2019 - 06:29 AM UTC
Great examples, 18Bravo


Quoted Text

CALLSIGN: RobinNilsson

Gears. Toothed ring carrying the pedals and then one or more gears (uneven number) to carry the rotation over to the rear wheel. It looks as if the rear wheel has some shine objects on the centerline. Two tyres side by side with a toothed ring sandwiched between them???
I wonder how well it stands up to dirt getting in the gears ....
/ Robin



oh yeah, good eye. I missed that entirely at first sight. This thread really evolved in great direction!