Questions tagged [bicycles]

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0answers
46 views

How fast could a human pedal a car? [closed]

Suppose that we were to install bicycle pedals into a passenger car, say a civic coupe, in such a way that pedaling is as mechanically efficient as riding an ordinary bike. Further suppose that we ...
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1answer
28 views

Measuring Torque in a bicycle [closed]

How to measure torque in a bicycle? how much newtons will produce by the pedal of the cycle ?
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0answers
20 views

Why do instructions on creation of roller chain sprocket tooth profile require redundant measurements?

I'm CADing a tooth profile for a bicycle chainring model and I'm referring my measurements and formulas to these sources: http://www.gearseds.com/files/design_draw_sprocket_5.pdf https://data.epo.org/...
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2answers
157 views

How do I add magnets to the mechanism of my exercise bike?

I have an exercise bike that works by a (I'm assuming solid iron) flywheel and a 'horseshoe' of magnets that are moved in and out to set the difficulty. I have attached an image of the same design ...
0
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2answers
74 views

Bike wheel sizes

I was passing by a row of motorbikes and mopeds yesterday, and noticed they all have really small radius wheels compared to bicycles. Not all motorbikes are equal (some motorbikes are literally ...
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2answers
34 views

Larger battery from 18650 batteries - using a case?

I want to build a battery for an electric bicycle using 18650 batteries. But I'm not into spot welding so much. Would it be possible to build a large case for the 18650 batteries with these types of ...
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3answers
100 views

How far can I drive an electric bicycle with a 250 watt engine using three serial connected 12 V motorbike batteries?

How far can I drive an (average sized) electric bicycle with a 250 watt engine using three serial connected 12 V motorbike batteries? Trying to research the feasibility of this. I would like to ...
1
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3answers
102 views

Why is the rear wheel of the Penny-farthing so small?

I see a lot of people asking why the Penny-farthing's front wheel is so big, and I think I've read enough materials to understand why (at least, at the most basic level). But even so, I feel that the ...
3
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4answers
264 views

What makes scooters unstable at high speeds?

Scooters and skateboards are obviously meant for slower speeds, below 5 MPH. Typically if you go faster than that, it becomes harder and harder to control the scooter, and you will fall off. An ...
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3answers
65 views

heavy duty cargo bike - which direction to choose

I would like to build a heavy duty cargo bike. Heavy = approx 200Kg of load on the front rack. I want 2 front wheels. Basically, there are 2 options that I know of: the front wheels are fixed to ...
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2answers
120 views

What is an advantage/disadvantage of difference wheels size in front and rear of a bicycle?

Suppose there is a vehicle with difference size of wheels in front and in rear. Specifically bicycle, There would be 2 cases that front wheel larger than rear wheel and vice versa I would like to ...
3
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1answer
784 views

Actual amount of reinforcement gained by adding gusset to welded steel tube construction

This question bothers me for quite a while and is about bicycle frame construction, specifically a BMX frame and even more specifically it's front triangle. It is a heavy duty frame by definition, and ...
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2answers
131 views

How are single tube bicycles prevented from collapsing?

From time to time I come across bicycles with a particular geometry (or rather a lack of). Most of them have no seat and a single tube which simply connects wheels and has the bottom bracket (if that ...
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2answers
155 views

Designing and fabricating custom gears and sprockets

I need to get a motor from an electric motorbike to drive a single-speed BMX Bike chain, and I haven't worked with bikes/sprockets before so I don't know where to start (I was only supposed to be ...
1
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1answer
496 views

Why there is no piston style pedal bicycle?

I have interested in walking bicycle. For the concept is just bicycle that you don't cycling pedal but stepping or striding to drive wheel Which leads me to think that is it better if we use linear ...
4
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1answer
1k views

Clamping force of a bicycle quick release skewer

In brief: between a standard quick-release skewer and a bolt-on skewer, which will provide greater clamping force? More detail: Modern bicycle wheels are held in place by clamping skewers that run ...
5
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4answers
701 views

What are the technical obstacles for using flywheel-based regenerative braking on bicycles?

Is it possible to convert the energy you would normally lose when braking your bicycle to rotational energy by attaching an extra wheel which would start to rotate once you use your brakes? E.g., when ...
2
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1answer
194 views

What is the impact toughness for some common bicycle frame materials?

I've been trying to compare popular materials for bicycle frames in terms of their mechanical properties. One thing I noticed is that it's hardly possible to find a data sheet specifying the impact ...