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Old 11-07-2012, 01:46 AM   #1
mike215
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gear inches

ive been reading a lot about gear inches and have one question about it
a 70 gear inch....is it the same feel with a 40x15 as a 48x18?
like would acceleration be the same with the two since it is roughly the same gear inch?



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Old 11-07-2012, 02:32 AM   #2
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Gear inches are gear inches. If you're riding brakeless, you should be more concerned about skid patches:

44/16 simplifies to 11/4, so there would be 4 skid patches.
45/15 simplifies to 3/1 so there would only be 1 skid patch.
42/15 simplifies to 14/5, so there would be 5 skid patches.
43/15 can't be further simplified, so there would be 15 skid patches.


Special thanks to Sheldon "Get a front brake" Brown



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Old 11-07-2012, 02:36 AM   #3
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i will have atleast a front brake on it...pretty much cause i havent read about skid patches yet so i know nothing of them

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Old 11-07-2012, 02:56 AM   #4
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Look at gear inches as a piece of string. An 18 inch piece and six in piece are two feet, same as two 12 inch pieces. Doesn't matter what chainring and cog you use to get the gear inches - any combination that results in the same inches will feel the same.

Skid patches matter - the more you have, the longer your tire will last. But using a brake is a much better idea.

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Old 11-07-2012, 03:06 AM   #5
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ok i understand gear inches..i did some more reading.
as for skid patches from what i got is that there is 3 spots (since ill be going with a 48x18) where you could stop the pedals to skid. that close?
either way i will be using a brake, i just feel like i want to understand this

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Old 11-07-2012, 11:21 PM   #6
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If you use your brake, you won't need to worry about skid patches.

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Old 11-08-2012, 03:27 AM   #7
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Quote:
Originally Posted by Industry_Hack
If you use your brake, you won't need to worry about skid patches.
Alright good to know...thanks
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Old 11-10-2012, 01:04 PM   #8
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I have thaught about this 40x15 48x18 evean though thay are the same gear inches, would the 40x15 have more leverage as the peddal is farther from the sprocket ?? makeing it easer to peddal ??

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Old 11-10-2012, 03:30 PM   #9
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Wild, leverage comes from crank length.

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Old 11-12-2012, 03:23 AM   #10
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the only thing i would possibly think about is wear vs weight comparing the two set ups?



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