Certainly true and why i specified a wheel with a circumference of 10
" not a DIAMETER of 10".. you're one of those guys who never read the
question through aren't you? ;-))
Lester
On Oct 21, 2008, at 7:19 PM, Hal Faulkner wrote:
> Bob,
> Circumference of 10" wheel is 31.4159.... inches (10 pi)
> Circumference of a 20 inch wheel is 62.82318 (20 pi = 2(10 pi))
> Hal
>
> -----Original Message-----
> From: spridgets-bounces@autox.team.net
> [mailto:spridgets-bounces@autox.team.net]On Behalf Of Kitterer Bob
> Sent: Tuesday, October 21, 2008 4:46 PM
> To: Spridget List
> Subject: Re: [Spridgets] Bentley-RR Trivia: was calculating speed
>
>
> Going from 10 to 20 inch wheels at the same rpm will be three times
> as fast not twice - C= pi D :-0
>
> Bob Kitterer
>
> 1960 Austin Healey Sprite (Mk IV in disguise)
> 1966 Austin Healey Sprite Mk III (Trevor) - still in boxes
> 2000 Miata Special Edition
>
>
>
>
> On Oct 21, 2008, at 11:58 AM, Lester wrote:
>
>> For example a 20 hp bike motor that will turn 6000 revs (and
>> pretending that the tranny is direct drive) will turn the tires
>> 6000 revs. If those are 10 inch circumference tires then the bike
>> will go speed x,(no, I'm not going to calculate it out.) but if you
>> have 20 inch circumference tires then the bike will go twice as
>> fast *** IF *** it is not limited by drag and that the engine can
>> turn the 20 inch circumference tires at 6000 revs.
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