What gear ratio do u run on your Dj

PB Forum :: Dirt Jumping & Street
What gear ratio do u run on your Dj
Author Message
flag cmc4130
Posted: Feb 17, 2014 at 8:57 Quote
Fattymcbutterpants wrote:
Hate to beat a dead horse but....... I run 36, 14


36 / 14 X 26" = 66.85 gear inches. That's pretty stout !

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flag Fattymcbutterpants
Posted: Feb 17, 2014 at 11:51 Quote
cmc4130 wrote:
Fattymcbutterpants wrote:
Hate to beat a dead horse but....... I run 36, 14


36 / 14 X 26" = 66.85 gear inches. That's pretty stout !

Unsecure image, only https images allowed: http://i1239.photobucket.com/albums/ff509/austinmtbbmxalliance/Gear_Ratio_Chart.jpg
I could probably back it off a hair.
flag sirrob
Posted: Feb 17, 2014 at 16:03 Quote
Fattymcbutterpants wrote:
cmc4130 wrote:
Fattymcbutterpants wrote:
Hate to beat a dead horse but....... I run 36, 14


36 / 14 X 26" = 66.85 gear inches. That's pretty stout !

Unsecure image, only https images allowed: http://i1239.photobucket.com/albums/ff509/austinmtbbmxalliance/Gear_Ratio_Chart.jpg
I could probably back it off a hair.
59 OR 60 gear inches is about as stout as I would go. But that's just me.
Rob
flag Fattymcbutterpants
Posted: Feb 17, 2014 at 18:51 Quote
The dirt jumps I ride are all on a decend slope so it really doesnt seem that bad. My other dj still runs 1x9 so its not like I strictly run 36/14
flag tom666
Posted: Apr 20, 2014 at 8:05 Quote
carmarvalde wrote:
29 / 13 with 170mm 26" wheels

You are the first person I have found running the same gear ratio as me


It's the best.
flag under7ow
Posted: May 6, 2014 at 10:11 Quote
Just got my 22 / 9 comes out to 63.6 gear inches. So far my favorite for 26", wish I tried it sooner. The splined sprocket also lined up with my Ti 9t driver perfectly, so stoked on this setup. The chainring barely clears the frame.
Black Market Edit-1
Black Market Edit-1

Also found this awesome site for calculating any gearing http://www.sheldonbrown.com/gears/.
flag tom666
Posted: May 6, 2014 at 15:52 Quote
under7ow wrote:
Just got my 22 / 9 comes out to 63.6 gear inches. So far my favorite for 26", wish I tried it sooner. The splined sprocket also lined up with my Ti 9t driver perfectly, so stoked on this setup. The chainring barely clears the frame.
Black Market Edit-1
Black Market Edit-1

Also found this awesome site for calculating any gearing http://www.sheldonbrown.com/gears/.

how can it be that a 22t barely clears the frame!?
flag under7ow
Posted: May 6, 2014 at 20:46 Quote
tom666 wrote:
under7ow wrote:
Just got my 22 / 9 comes out to 63.6 gear inches. So far my favorite for 26", wish I tried it sooner. The splined sprocket also lined up with my Ti 9t driver perfectly, so stoked on this setup. The chainring barely clears the frame.
Black Market Edit-1
Black Market Edit-1

Also found this awesome site for calculating any gearing http://www.sheldonbrown.com/gears/.

how can it be that a 22t barely clears the frame!?
edit-1 22t clearance
edit-1 22t clearance

When I added the smaller 9t driver I had to use no spacers with the 22t sprocket for a perfect chainline. In the pictures that shows the tooth maybe 1/16" from the frame, and you can see just from frame flex it scraped just a hair off of the clearcoat. But those pics were after a hard park session right now, so I'm cool with it now. When I got the parts it came with a 28t ring and i had maybe 1/2" of spacers to keep it off of the frame and had my chainline all outta wack.
flag Jaaaaaaaames
Posted: May 8, 2014 at 8:33 Quote
I run 25/9, 26" spank tweet tweet
flag cmc4130
Posted: May 8, 2014 at 14:55 Quote
under7ow wrote:
tom666 wrote:
under7ow wrote:
Just got my 22 / 9 comes out to 63.6 gear inches. So far my favorite for 26", wish I tried it sooner. The splined sprocket also lined up with my Ti 9t driver perfectly, so stoked on this setup. The chainring barely clears the frame.
Also found this awesome site for calculating any gearing http://www.sheldonbrown.com/gears/.

how can it be that a 22t barely clears the frame!?

When I added the smaller 9t driver I had to use no spacers with the 22t sprocket for a perfect chainline. In the pictures that shows the tooth maybe 1/16" from the frame, and you can see just from frame flex it scraped just a hair off of the clearcoat. But those pics were after a hard park session right now, so I'm cool with it now. When I got the parts it came with a 28t ring and i had maybe 1/2" of spacers to keep it off of the frame and had my chainline all outta wack.

That is great information. I'm glad you posted it. Very interesting that you have to run 22/9 with this frame.... Then again, I'm not that surprised, because to get such short chainstays on new school 26"s while also accomodating fat tires, there really isn't much room left for sprockets. I'm wondering if you think your 9t driver is spaced closer to the center of the hub than the cog on a different style hub would be. I run 30/14 with a regular 14t freewhel on my Mob. I recall people saying you could do 32t and 34t, but not with decent chainline!! (on a hub that doesn't allow for cog spacing)

Sprocket clearance seems like the type of thing Black Market should put on their website in the specs:
http://www.blackmarketbikes.com/index.php?option=com_blackmarketbikes&view=category&Itemid=4&id=2&cid=23
flag under7ow
Posted: May 8, 2014 at 16:35 Quote
cmc4130 wrote:
under7ow wrote:
tom666 wrote:


how can it be that a 22t barely clears the frame!?

When I added the smaller 9t driver I had to use no spacers with the 22t sprocket for a perfect chainline. In the pictures that shows the tooth maybe 1/16" from the frame, and you can see just from frame flex it scraped just a hair off of the clearcoat. But those pics were after a hard park session right now, so I'm cool with it now. When I got the parts it came with a 28t ring and i had maybe 1/2" of spacers to keep it off of the frame and had my chainline all outta wack.

That is great information. I'm glad you posted it. Very interesting that you have to run 22/9 with this frame.... Then again, I'm not that surprised, because to get such short chainstays on new school 26"s while also accomodating fat tires, there really isn't much room left for sprockets. I'm wondering if you think your 9t driver is spaced closer to the center of the hub than the cog on a different style hub would be. I run 30/14 with a regular 14t freewhel on my Mob. I recall people saying you could do 32t and 34t, but not with decent chainline!! (on a hub that doesn't allow for cog spacing)

Sprocket clearance seems like the type of thing Black Market should put on their website in the specs:
http://www.blackmarketbikes.com/index.php?option=com_blackmarketbikes&view=category&Itemid=4&id=2&cid=23

The Ti 9t driver I installed on my bike replaced a 12t driver and it was spaced further out, probably could used a few more spacers to achieve better chainline with the 28/12 it came with, but i was planning on 22/9 anyways. Gotta say much easier with the splined sprocket and being able to put spacers on the outside of the sprocket to keep cranks from hitting frame. Getting the short chainstays on this frame with keeping the frame straight and strong rather than a bend or dent in it to clear chainrings is part of why I chose this frame over others. Just went with it now im in love.
flag Oldmann
Posted: May 8, 2014 at 17:34 Quote
54 (25 / 12).....pretty easy for an old man to get around on. Thats on my Eastern. Not sure whats on my bmx.

Flame / tease away about man'ing up if you like....I'm married with 2 kids so no balls anymore anyway and nothing hurts ha ha ha ha ha ha
flag ZenkiS14
Posted: May 9, 2014 at 20:42 Quote
I'm switching to 33:15 to more accommodate my local BMX track. Renthal Ring coming!!

 


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