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Author Topic: Gearing Math(s)  (Read 1940 times)

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wildwood

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Gearing Math(s)
« on: December 03, 2010, 12:22:10 PM »

Just found another equation for gearing that came out of Crawl mag

Might be useful for those going up a size or 2 and who know their current ratios...........

Works like this and I'll use my own rig as example
I am going to a spit near 40" from a spit near 35" with current 4.56 ratio

40 divided by  35 x  current ratio =

So 40 div by 35 = 1.142 x 4.56 =5.21

So picking nearest 'deeper gearing' means 5.38s thank you

Seems to work with other ration equations that are more complex..... hope it is of use :icon_twisted:

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Bulldog67

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Re: Gearing Math(s)
« Reply #1 on: December 03, 2010, 12:36:40 PM »

I have bookmarked it for a day when i get that far  :icon_winkle:
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scrw

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Re: Gearing Math(s)
« Reply #2 on: December 03, 2010, 12:58:02 PM »

hey that works
stock WG, 29" & 3.55 to 32" and 3.91
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JamesH

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Re: Gearing Math(s)
« Reply #3 on: December 03, 2010, 06:13:29 PM »

Seems good, and I like the advice about going to next deepest - makes up for the added weight as well as increased diameter (to some extent).
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Nosebolt

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Re: Gearing Math(s)
« Reply #4 on: December 03, 2010, 06:45:11 PM »

or you could use the Birtys Gearing Guide or the Tyre and Gear Calculator  :003:
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scrw

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Re: Gearing Math(s)
« Reply #5 on: December 03, 2010, 06:47:23 PM »

But its wrong, certainly for my WG
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Nosebolt

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Re: Gearing Math(s)
« Reply #6 on: December 03, 2010, 06:55:04 PM »

But its wrong, certainly for my WG

are you sure,

the calc says 29" & 3.55 to 32" gives 3.917

and the chart says for 32s between  3.73 for economy to 4.56 for power or 3.91, 4.11 or 4.27 for something in between
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