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32 cc speed
- Thread starter matman55
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rcarteraz07
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More like one person thinks one thing but another disagrees so they both are trying to explain to each other in hopes they both understand. A lot of not understanding and then a sudden moment of
Doc Sprocket
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Not at all. Just food for thought.
OK....I posed the same question at motoredbikes.com, and got this answer
"Only if the bike weighs more. Other than that, no, tire diameter means nothing. The bike can only move as fast as the surface speed of the roller.
*edit* I'll try to describe it a little bit better than him.
I assume you're thinking about how gearing works, right? Well what you've forgot to add into the equation is that when you change your gearing, you haven't changed tire size. Now, if you would have changed your tire size the same % as you've changed your gearing, the bikes speed will stay the same. That's how it works with friction-drives. The tire is the gear so every time you change the tire, the gearing changes with it, cancelling each other out."
I am still on the side of tyre doesn't factor in though. You will still be going the same speed as the roller does. Maybe we are getting confused between speed and gearing??
"Only if the bike weighs more. Other than that, no, tire diameter means nothing. The bike can only move as fast as the surface speed of the roller.
*edit* I'll try to describe it a little bit better than him.
I assume you're thinking about how gearing works, right? Well what you've forgot to add into the equation is that when you change your gearing, you haven't changed tire size. Now, if you would have changed your tire size the same % as you've changed your gearing, the bikes speed will stay the same. That's how it works with friction-drives. The tire is the gear so every time you change the tire, the gearing changes with it, cancelling each other out."
I am still on the side of tyre doesn't factor in though. You will still be going the same speed as the roller does. Maybe we are getting confused between speed and gearing??
You have really given me a really good chuckle with the frog comment. I still can't get the smile off my face.
I am still not 100% convinced though. I still think that whatever the tyre size, the roller diameter is what determines speed
Doc Sprocket
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*Ribbit!* LOL
Thanks, Augidog, for clearing that one up.
Thanks, Augidog, for clearing that one up.
That is what I like about this forum. You get some good help, with people being patient and taking the time to explain things.
Hey....where did Augidogs comments go? That was some good stuff.
no it wasn't, i was wrong about it all. if i had to explain where i was wrong, i'd only make matters worse. the best i can come up with is "power is never applied to the rear hub, but transferred directly to the ground."
from your post above:
i used the calculator, and so long as number of teeth matches tire diameter, you can change the tire and use the exact same roller to get the exact same speeds.
first use 26" tire, 6000 rpm, 26 teeth on axle, 1.5 teeth on clutch
then use 20" tire, 6000 rpm, 20 teeth on axle, 1.5 teeth on clutch
you get 27mph either way
http://www.diygokarts.com/speed-calculator.html
my humble apologies for the confusion.
from your post above:
think of rack & pinion, that's what i did to finally see the light.
i used the calculator, and so long as number of teeth matches tire diameter, you can change the tire and use the exact same roller to get the exact same speeds.
first use 26" tire, 6000 rpm, 26 teeth on axle, 1.5 teeth on clutch
then use 20" tire, 6000 rpm, 20 teeth on axle, 1.5 teeth on clutch
you get 27mph either way
http://www.diygokarts.com/speed-calculator.html
my humble apologies for the confusion.
No problem. You know more about MAB's than I will ever know. He//, you have forgotten more about MAB's than I will ever know...
It all depends on how you gear it.
first, it wasn't an argument. it was a detailed dialogue that led to a solution & agreement.
second, now you're discussing an entirely different arrangement. browse the kart and mini-bike sections for similar horsepowers and you'll find everything you need to know.
second, now you're discussing an entirely different arrangement. browse the kart and mini-bike sections for similar horsepowers and you'll find everything you need to know.
Come on..... There is not any sticky worthy info here. Not in my opinion
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