25-9 or 30-9

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4/21/2013 1:27 PM
Edited Date/Time: 4/21/2013 1:31 PM

which has more stress (ie. which will make the chain last longer thae chain is kmc dropbuster) or can i have your combinations and why you use those combinations

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4/21/2013 1:31 PM

The 30-9 has more stress. The 25/9 will let your chain last more.

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4/21/2013 1:32 PM

i run 28/9, its a little harder to begin with but i like it a lot more

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4/21/2013 2:10 PM

get 28/9 it's the best ratio. i'm so sick of the 25/9 i have on now.

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4/21/2013 2:44 PM

28/9 is pretty good.
I'm currently riding 25/9 and I'm fine with it, I ride my chain very tight though, so it feels a little stronger.
30/9 puts more stress on the drive train.

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4/21/2013 3:09 PM

The 25/9 is easier to pedal. I've rode 25/9 on a few different bikes and I'm now running 28/10 I like both.

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4/21/2013 3:33 PM

Four wrote:

The 25/9 is easier to pedal. I've rode 25/9 on a few different bikes and I'm now running 28/10 I like both.

They should feel pretty similar.

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4/21/2013 3:39 PM

Four wrote:

The 25/9 is easier to pedal. I've rode 25/9 on a few different bikes and I'm now running 28/10 I like both.

andyferly wrote:

They should feel pretty similar.

Yeah they do, 28/10 is a just a bit harder to pedal but nothing bad or anything, both feel nice.

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4/21/2013 3:43 PM

28-9 is the best, there's a little more resistance but I get more speed with it

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4/21/2013 4:47 PM

28/9 is cool I run it now, I want to try 30/10

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4/21/2013 4:49 PM

I really want to run 27/9.

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4/21/2013 4:57 PM

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

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4/21/2013 4:58 PM

Ive run 30 10 for years i love it i step on other bikes and they feel so slow......i just baught a profile ti 9 tooth driver im going to switch to 30 9

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4/21/2013 5:35 PM

TheBrandonFranke wrote:

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

^^^ This. Smaller sprocket/driver sizes wear out faster

From the surly website
Photo

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4/21/2013 9:29 PM

TheBrandonFranke wrote:

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

25/9=less stress on chain
28/9=more stress on chain
And the Surly website must not be very bike smart

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4/22/2013 4:17 AM

take 25-8
its awesome ratio

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4/22/2013 8:46 AM

TheBrandonFranke wrote:

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

DialedGuerraBmx wrote:

25/9=less stress on chain
28/9=more stress on chain
And the Surly website must not be very bike smart

Why not? That explanation seems right to me.

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4/22/2013 8:50 AM

I've ran both, 30-9 at the moment, i'm never going back, pedalling doesn't feel that much different after a week, you barely notice the change, you do notice who much faster it is though. Also the smaller the gearing the more stress on the chain, because there is less surface area of the chain for the force to spread out over.

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4/22/2013 1:53 PM

I ride 25/9, no probs. its all preference: how tight do you run your chain, how hard a gear you prefer... it all depends. but i have no complaints with 25/9

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4/22/2013 2:01 PM

TheBrandonFranke wrote:

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

Kyle_Marston wrote:

^^^ This. Smaller sprocket/driver sizes wear out faster

From the surly website
Photo

Both of these are right but you gotta consider that the driver size stays the same. If you want less stress do what racers do and run a 44t with 16t freewheel, but since both youre using a 9t with both 25 and 30, the 30 will stress it more from more force on the drivetrain. 8 tooth drivers suck because if you think about it all the pressure is put on only 1 or 2 links as opposed to 3-4 on bigger drivers. the jump from 25 to 30 is pretty big, I am happy with 28-9 but who knows I may go to 30-10 for the higher gearing and lower stress

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4/22/2013 9:03 PM

I have 25/9 and it's starting to feel gross

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4/23/2013 12:34 PM

TheBrandonFranke wrote:

Pretty sure 25/9 has more force on the drivetrain.
Thats why people running nano & 8 tooth drivers have chains snap alot.

Kyle_Marston wrote:

^^^ This. Smaller sprocket/driver sizes wear out faster

From the surly website
Photo

FEDEXdoobie wrote:

Both of these are right but you gotta consider that the driver size stays the same. If you want less stress do what racers do and run a 44t with 16t freewheel, but since both youre using a 9t with both 25 and 30, the 30 will stress it more from more force on the drivetrain. 8 tooth drivers suck because if you think about it all the pressure is put on only 1 or 2 links as opposed to 3-4 on bigger drivers. the jump from 25 to 30 is pretty big, I am happy with 28-9 but who knows I may go to 30-10 for the higher gearing and lower stress

30-10 is actually lower geared than 28-9.

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