Looking for a 9t Cassette for a 26" dj.

PB Forum :: Dirt Jumping & Street
Looking for a 9t Cassette for a 26" dj.
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flag DennyKeragon
Posted: Oct 18, 2014 at 10:48 Quote
I'm new to this style of riding and am basically building a bike from the ground up. I plan to do a lot of urban riding and I'm trying to keep the weight to a minimum. Is there a decent 9t cassette I can toss on my bike? If that's a bad idea I'm open to any type of suggestions, like I said, I'm new to this!
flag cmc4130
Posted: Oct 18, 2014 at 17:19 Quote
With 26" wheels, you might not actually want 9t. The reason is that the common gear ratio changes depending on wheel diameter. So, 25/9 and 28/9 are common with 20" bmx. But the close equivalent for 26" is 25/11 or 25/12.

https://www.pinkbike.com/forum/listcomments/?threadid=143228
flag walkingtall76
Posted: Oct 20, 2014 at 12:58 Quote
Even a 12t or an 11t can cause skip on the chain if youre using a 1/8 They are so small. 9t forget it. If you want to use chro-mo cranks then your best set up is about 28t -12t. If you use single DH cranks your only choice really is 32t and up. 32t and 14t work well. Some people use xtr double ring crank and use the small ring placement at 28t. But that's a double crank and youd have to get your line and BB correct. There ya go...all you need to know Wink
flag ricar
Posted: Oct 20, 2014 at 15:23 Quote
walkingtall76 wrote:
Even a 12t or an 11t can cause skip on the chain if youre using a 1/8

How does the cog cause a skip?
flag zarbam
Posted: Oct 21, 2014 at 4:26 Quote
ricar wrote:
walkingtall76 wrote:
Even a 12t or an 11t can cause skip on the chain if youre using a 1/8

How does the cog cause a skip?

There is not enough space below the chain. I tried a 12t and the chain is resting on the single speed spacers. The lowest that works for me is 13t.
flag Corphies
Posted: Oct 21, 2014 at 11:05 Quote
I ride a 9t driver from profile with 0 problems..
flag Vinnie1213
Posted: Oct 21, 2014 at 11:24 Quote
I ride 25-9, no problems at all. Hard to pedal but it keeps me accustomed to higher speeds.

Profiles are great. NS too.
flag cmc4130
Posted: Oct 21, 2014 at 13:33 Quote
zarbam wrote:
ricar wrote:
walkingtall76 wrote:
Even a 12t or an 11t can cause skip on the chain if youre using a 1/8

How does the cog cause a skip?

There is not enough space below the chain. I tried a 12t and the chain is resting on the single speed spacers. The lowest that works for me is 13t.

Yeah, but there are hubs designed specifically for 9t and 10t. Less common with mtb hubs, but super common in BMX.

http://www.chainreactioncycles.com/us/en/ns-bikes-rotary-rear-singlespeed-pro-hub-2014/rp-prod87933
flag cmc4130
Posted: Oct 21, 2014 at 13:38 Quote
Vinnie1213 wrote:
I ride 25-9, no problems at all. Hard to pedal but it keeps me accustomed to higher speeds.

Profiles are great. NS too.

With 26" wheels? 25 / 9 X 26 = 72.2 gear inches. That's pretty stout. Close to what fixed gear track bike riders run for Velodromes. Big Grin

Unsecure image, only https images allowed: http://i1239.photobucket.com/albums/ff509/austinmtbbmxalliance/Gear_Ratio_Chart.jpg
flag ricar
Posted: Oct 21, 2014 at 18:09 Quote
zarbam wrote:
ricar wrote:
walkingtall76 wrote:
Even a 12t or an 11t can cause skip on the chain if youre using a 1/8

How does the cog cause a skip?

There is not enough space below the chain. I tried a 12t and the chain is resting on the single speed spacers. The lowest that works for me is 13t.

That is because your spacer is too thick. i am currently running a 12T cog and have no issues at all. 11, 10, and 9 run on a different system altogether.
flag walkingtall76
Posted: Oct 21, 2014 at 20:18 Quote
Bottom line. Unless you are using a hub specific 26" wheel, the lowest you can go without causing any issue is 12t and that in my experience isn't ideal. 13 and 14t are best Wink
flag Corphies
Posted: Oct 21, 2014 at 21:49 Quote
Wat?
All wheels have hubs. Do you mean a hub with a driver specifically for smaller cogs?
flag walkingtall76
Posted: Oct 21, 2014 at 22:59 Quote
Well of course I meant for cogs ya tool...is that not what the whole thread is about?? Go elsewhere with your attitude mate
flag Corphies
Posted: Oct 21, 2014 at 23:08 Quote
Lol? Ok. I was not having any sort of attitude. I was just genuinely confused at "Hub specific 26" wheel". Sorry bud.
flag BSal
Posted: Oct 21, 2014 at 23:11 Quote
Dartmoor, profile and a few others make 9t hubs for MTB frames. You will need to run a 21 or 22t front sprocket tho to keep your gear ration the same. "you tool' HAHAHA what a little jerk.
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