July 18th, 2011, 10:17 PM | #1 |
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how much does tire size affect the final drive?
would increasing the front tire size equal less rpm at higher speeds? (like gearing)
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July 18th, 2011, 10:21 PM | #2 |
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The size of the front tire has nothing to do with rpms of the engine, or gearing, is that what you meant?
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July 18th, 2011, 10:41 PM | #3 |
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The front tire hub has a gear and cable that runns the speedometer and trip meter.
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July 18th, 2011, 10:50 PM | #4 |
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I know gearing is what mainly determines rpm but i thought tire size influences it as well. isnt that why drag race cars have off set tires, for faster acceleration?
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July 18th, 2011, 10:55 PM | #5 |
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I'm still not sure I follow. Drag cars have tiny front wheels because they don't need anything larger. The thinner and lighter they are, the less drag they have, so at very high speeds, the car can go that slight bit faster than it would with wider or heavier wheels. They still have nothing to do with the drive of the car (or the bike), and have nothing to do with the gearing, or the drivetrain at all, right?
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July 18th, 2011, 10:58 PM | #6 | |
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Quote:
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July 18th, 2011, 11:07 PM | #7 |
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No, the rpm's of the engine have nothing to do with the front wheel. If the rear wheel was taller, the rpm's of the wheel (and therefore the engine) would be slightly lower in proportion to the larger size of the wheel. It would be the same as going with slightly taller sprockets.
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July 18th, 2011, 11:49 PM | #8 |
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July 19th, 2011, 01:02 AM | #9 |
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The only thing that affects gearing other than gears/sprockets is the rear wheel diameter. The front will only affect the speedo reading.
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July 19th, 2011, 07:59 AM | #10 | |
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So to answer your first post, a smaller tire circumference may allow you to accelerate slightly faster (probably not even noticeable), but won't do much for top speed. It does affect your speedometer reading in cars and bikes with electronic speedos, but not on our bikes since the speedo reads off the hub and is mechanical.
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July 19th, 2011, 02:51 PM | #11 |
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Your still travelling the same distance?
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July 19th, 2011, 05:52 PM | #12 |
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tire size will not significantly effect your rpms at all on the subject of gearing, but it will require an increase of power to turn them because the added weight and drag. I know what you are asking because I asked the same thing in my first Auto-class in high school lol There was a lot of pain and pictures and yelling before it was explained to me in a way I understood ; but I assure you, alex is right, tire size will not 1. effect your rpms 2. effect your speed 3. change your acceleration/top speed on a gearing level (it is only top speed) will if you get a larger size. The reason drag cars have smaller fronts is like Alex said, less drag = faster accel; and like Thunder said, it will only change your acceleration very slightly, probably only hundreths and maybe tenths of a second (because sometimes that makes the difference on the strip)
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July 20th, 2011, 08:42 AM | #13 |
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Silly readers. ANY change in the circumference of a tire will change the wheels RPM given a steady velocity. The question that should be asked is, "At what size will the change in rpms be noticeable?" THAT question should be answered thusly, "At no size that will make the vehicle behave the same will a tire change noticeably affect the wheels RPM."
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July 20th, 2011, 08:51 AM | #14 | |
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Some of you need to sit through 6th grade science again. Simple machine #1 - the wheel. The original question is vague, but alex is correct. Changing the size of the front tire will have no effect on the speed or gearing of the bike mechanically. Only the reported speed as the front wheel will be spinning at a different rpm. |
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July 20th, 2011, 09:01 AM | #15 | |
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This is also incorrect, for the reason you stated. A smaller front tire would cause the front wheel (hub and all) to be turning at a higher rpm. It will effect the speedometer reading. |
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July 20th, 2011, 09:09 AM | #16 |
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In regards to the our 250, we already experience up to a 10% discrepancy in speed. A slight change in tire size will not make a noticeable difference in the way the mechanical speedo reads.
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July 20th, 2011, 09:10 AM | #17 | |
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