Need Help with gearing?

Author	Message

James116

Posted: Oct 28, 2007 at 13:35	Quote
Hello I am running a 36t sprocket on the front of my hardtrail bike and a 16t single speed on the back. I want a smaller sprocket on the front but I want the same amount of 'hardness on pedaling' If I go with a 32t sprocket on the front and a 12t sprocket one back will I have the same type of gearing?

crewsdawg

Posted: Oct 28, 2007 at 19:51	Quote
no, it will be harder to pedal is you run a 32/12. a 2:1 gear ratio is pretty standard, whether you run a 32/16, 28/14, whatever. i would start with a 2:1, then tweak from there. fyi though, i run a 28/14 and its the best all around. park, dj, no prob. street is kinda a bummer (gears are nice for street) but its no big deal.

rlee560

Posted: Oct 28, 2007 at 19:57	Quote
Front sprocket divided by rear cog times the wheel sized should be close to 55. For example 25/12 x 26=54.1666 or This is typically how it is figured with the magic number being 55

ricar

Posted: Oct 28, 2007 at 20:20	Quote
2:1 ONLY works with 26" wheels.

rhynoj

Posted: Oct 29, 2007 at 4:05

Quote

ricar wrote:

2:1 ONLY works with 26" wheels.

good piont
for bmx its 2.8:1

and for 24 inch wheels 2.3 :1

James116

Posted: Oct 29, 2007 at 5:43	Quote
Thankyou for the help guys. I have ordered this sprocket http://chainreactioncycles.com/Models.aspx?ModelID=17742 I ordered this in a 34t sprocket. (Sent it back didn't Fit) and this crank http://chainreactioncycles.com/Models.aspx?ModelID=6237 Did I do good to order this or not? Thanks again james

James116

Posted: Oct 30, 2007 at 13:03	Quote
If I go with a 32t sprocket on the front what tooth sprocket would I need on the back to keep the same amount of hardness as I do with a 36t on front and a 16t on back. Thanks james

James116

Posted: Oct 30, 2007 at 13:59	Quote
I need to know this by tomorrow morning if someone can help me please I would be most grateful. Thankyou james

ricar

Posted: Oct 30, 2007 at 19:03	Quote
OK write this down, it's been posted by myself more than 10 times and was already in this thread. Do your own math. Chain ring, times wheel size, divided by rear cog size = whatever you like but generally 55. 44 tooth sprocket times 20" wheel equals 880. 880 divided by 16 tooth freewheel equals 55. If you want harder go 56 easier 54.

James116

Posted: Nov 2, 2007 at 11:32	Quote
Ok Sorry if this is starting to annoy you guys I am only 14. I am useless with ratio's All I need to find out is if I go from a 36t sprocket to a 34t sprocket on the front do I go from a 16t on the back to a 14t? So if I go with a 34t on front do I go to a 14t on the back. I AM RUNNING 26" WHEELS Thankyou for help so far.

blakleyl

Posted: Nov 2, 2007 at 11:55

Quote

ok so you are currently at 36/16 well that is a 2.25 ratio. 34/16 is 2.125. 34/14 is 2.43. So Basically what this means is you will not get your same speed with a 34 tooth. There is just no back cog that gives you the same speed. Well unless you can get ahold of a 15 tooth for the back then it is the same. So decide what you would like to sacrifice more. You can keep the 16 tooth on the back you will be a little slower. Or you can swap to the 14 tooth and you will be a little faster. Choose which one you want.

James116

Posted: Nov 2, 2007 at 11:56	Quote
Would 32t and 14t be the same speed? Thankyou james

ricar

Posted: Nov 2, 2007 at 18:39	Quote
36 teeth times 26" = 936. Divide by 16 teeth for a final,,,,58.5 (hard gear) 34 26 884 16 55.25(normal gear) 34 26 884 14 63.1 (really hard gear) Simple math and I know your computer has a calculator in it so how bout you try one?

fluder

Posted: Nov 2, 2007 at 20:23

Quote

James116 wrote:

Would 32t and 14t be the same speed?

Thankyou

james

that would be probably the closest thing you can get to 36/16. it will probably feel almost the same

i suggest something light though, like 30/15 which is what i'm riding, or 30/14 which is what i would rather ride lol. but like on 30 15 i am able to clear basically any dj.

chronicfreerider

Posted: Nov 2, 2007 at 20:42	Quote
they still teach math in school right?

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