32 X 18 = 36 X ?- Mtbr.com

Thread: 32 X 18 = 36 X ?

20?????

2. Almost

call it 20.

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3. Originally Posted by Bike Nazi
20?????
yeppa

4. Thanks for the lesson. I'm good with visuals.

5. Originally Posted by mtbiker731

call it 20.

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awesome explanation!

6. Drawing. So cool.

100 points for you !

7. 22!

I come up with a different answer, 22. But then again, I am interpreting your question differently. If you are looking for the same gear ratio, then the above answers are correct. If, on the other hand, 32x18 is the magic gear ratio for your frame, and you want a different ratio using a 36 tooth chainring, then a 22 tooth cog will give you the same chain tension.

32x18=1.77
36x22=1.63

8. Originally Posted by bikeny
I come up with a different answer, 22. But then again, I am interpreting your question differently. If you are looking for the same gear ratio, then the above answers are correct. If, on the other hand, 32x18 is the magic gear ratio for your frame, and you want a different ratio using a 36 tooth chainring, then a 22 tooth cog will give you the same chain tension.

32x18=1.77
36x22=1.63
1.77 = 1.63 ?

I thought I was bad at math.

9. Originally Posted by long hazy daze
1.77 = 1.63 ?

I thought I was bad at math.
Please read my post again! My whole point is that 1.77 is different than 1.63, but gives you the same chainstay length! Your original post never said you wanted the same ratio, maybe you wanted the same chainstay length for a magic gear for your frame.

10. 32:18 or 36:20 are perfect for around here. Upstate South Carolina and various venues across the NC border.

11. Wow, ten replies to a gear ratio question! With a debate to boot.

12. No magic for me

Originally Posted by bikeny
Please read my post again! My whole point is that 1.77 is different than 1.63, but gives you the same chainstay length! Your original post never said you wanted the same ratio, maybe you wanted the same chainstay length for a magic gear for your frame.
with only one gear, I need to pick it.

How about this one
32 x 18 =
30 x 16?

Here's the reason, my bike is geared just right at 32 x 18,
I'm putting together another bike and have a brand new 16T cog and 36T chainring,
being the tight ass I am, I'd like to use at least one of them.

13. Riddle me this, Batman............

...keeping in mind, I want to keep the chainstay length as close to possible when operating a dinglespeed, with MTB gearing of 32x18. If I install a 16t cog, what front ring will suit me best during high-speed situations?

I'll need to see your work to merit an A.

14. Originally Posted by Bike Nazi
with only one gear, I need to pick it.

How about this one
32 x 18 =
30 x 16?

Here's the reason, my bike is geared just right at 32 x 18,
I'm putting together another bike and have a brand new 16T cog and 36T chainring,
being the tight ass I am, I'd like to use at least one of them.

that 16 should be a 17 to make the same ratio(or really close to it). my rule of thumb is 2 in the front is worth 1 in the rear.

15. Originally Posted by pvd

Thanks, but what language is that!?!?

16. Originally Posted by lubes17319
Thanks, but what language is that!?!?
Yeah, that is a little over my head! But if I read the charts correctly, you should us a 34 tooth ring with the 16 tooth cog. The chainstay length ends up slightly shorter, meaning your chain will be slightly loose, but probably not enough to matter. 35x15 should also work. Sorry, but I cannot show my work, I just picked numbers from PVD's chart!.

BTW, what you are doing is similar to the ENO double/double system. They use a crank with 35 and 38 tooth rings and a freewheel with 16 and 19 teeth to achieve two different gear ratios.

Mark

17. Originally Posted by bikeny
Yeah, that is a little over my head! But if I read the charts correctly, you should us a 34 tooth ring with the 16 tooth cog. The chainstay length ends up slightly shorter, meaning your chain will be slightly loose, but probably not enough to matter. 35x15 should also work. Sorry, but I cannot show my work, I just picked numbers from PVD's chart!.
I was thinking along the same lines as you. I got the closest set-up w/a 34t.

BTW, what you are doing is similar to the ENO double/double system. They use a crank with 35 and 38 tooth rings and a freewheel with 16 and 19 teeth to achieve two different gear ratios.

Mark
Yup. Just hundreds cheeper.

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