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Old 05-01-06, 12:45 AM   #1
bubbleboy
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What rear sprocket to change to?

Hi all, Please note my newbie status :-)
I have just bought a giant simple 3 cruiser it has a nexus 3 speed on it and I want to know what size sprocket should I put on the rear to get the a similar feel in the hardest gear to peddle as in the hardest gear on my MTB?
On my MTB the hardest gear is when it is on the rear 11 tooth and the large front chainring (I've forgotten how many teeth on this one and I can't check now as I'm at work) I know the cruiser has 36 teeth on the front and 20 on the rear. We only have slight hills here and I don't use the easy to peddle gear, I have only used the middle gear once and I'm wishing the hardest gear was harder to peddle. So I would like to change it so that it feels similar to the last hardest 2 gears on my MTB.
So any advice on what size rear sprocket I should get would be greatly appreciated.
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Old 05-01-06, 08:00 AM   #2
bubbleboy
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OK I am home now and the front chain ring on my mountain bike has 42 teeth
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Old 05-01-06, 08:42 AM   #3
Al1943
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What size are the wheels for both bikes? What you are asking for is the equivalent travel per crankshaft rotation that must take into account the wheel circumference of both bikes rear wheels.
If both bikes had the same size wheels the answer would be 36 X 11 / 42 = 9.42 teeth on the rear cog. Can't do that. You will need to change the front chainring to accomplish what you want.


Al

Last edited by Al1943; 05-01-06 at 01:58 PM.
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Old 05-01-06, 09:44 AM   #4
Sheldon Brown
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Quote:
Originally Posted by bubbleboy
Hi all, Please note my newbie status :-)
I have just bought a giant simple 3 cruiser it has a nexus 3 speed on it and I want to know what size sprocket should I put on the rear to get the a similar feel in the hardest gear to peddle as in the hardest gear on my MTB?
On my MTB the hardest gear is when it is on the rear 11 tooth and the large front chainring (I've forgotten how many teeth on this one and I can't check now as I'm at work) I know the cruiser has 36 teeth on the front and 20 on the rear. We only have slight hills here and I don't use the easy to peddle gear, I have only used the middle gear once and I'm wishing the hardest gear was harder to peddle. So I would like to change it so that it feels similar to the last hardest 2 gears on my MTB.
So any advice on what size rear sprocket I should get would be greatly appreciated.
You will need to know how many teeth you have on everything. Then you can run the calculations at:

http://sheldonbrown.com/gears and compare the results.

We have rear sprockets for your hub from 14 to 24 teeth.

Sheldon "Planetary" Brown
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Old 05-01-06, 07:37 PM   #5
bubbleboy
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Very good point I didn't even think about that the wheel diameter on both bikes is 26''
Im just going to check out Sheldons link.
Thanks
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Old 05-03-06, 02:46 AM   #6
bubbleboy
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after doing the calculations I'm going a 15 tooth .
Thanks.
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