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Sprockets, which is the best way to achieve your desired ratio

  • Thread starter Thread starter helmutholderbenz
  • Start date Start date
H

helmutholderbenz

Guest
Hi, I was wondering, which is the best way to achieve final drive ratio? Does it make any difference to go up or down a tooth on the front sprocket or does this put more strain on the motor?
 
best to go 530 conversion and minimum 16 tooth on the front. The options below show how you can swap a 16 and 17 to get stock and enhanced acceleration.

Call Z-1


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No matter what chain size you use, it's best to not go too tight of a radius with a smaller sprocket. If you have a 17-tooth on the front, you could drop one tooth to a 16 or add three teeth to the back, for about the same ratio, but your chain will appreciate keeping the 17 on the front.

.
 
posplayr said:
best to go 530 conversion and minimum 16 tooth on the front. The options below show how you can swap a 16 and 17 to get stock and enhanced acceleration.

Call Z-1


attachment.php
Click to expand...
He has a 83 750E so no need for a 530 conversion on a bike that came with 530.Stock on your bike's a 14 front and a 43 rear.A 14 530 front is a little small IMO,I have a 15 front in mine with no problem but I don't think there's room for a 16.
 
So it's all about final drive, it doesn't matter which way you get there, the motor doesn't know the difference?
 
SVSooke said:
He has a 83 750E so no need for a 530 conversion on a bike that came with 530.Stock on your bike's a 14 front and a 43 rear.A 14 530 front is a little small IMO,I have a 15 front in mine with no problem but I don't think there's room for a 16.
Click to expand...
What are you running in the rear? I'm running 15/ 45 which gives me 3.00 final which is pretty good all around but I'm wanting to do a little more open riding and was wanting to get in the 2.80ish range.
 
helmutholderbenz said:
So it's all about final drive, it doesn't matter which way you get there, the motor doesn't know the difference?
Click to expand...

That's correct. The general rule is to run the biggest front sprocket that fits (to reduce stress on the chain, as mentioned) and then use whatever rear you need to get the ratio of your choice.


helmutholderbenz said:
What are you running in the rear? I'm running 15/ 45 which gives me 3.00 final which is pretty good all around but I'm wanting to do a little more open riding and was wanting to get in the 2.80ish range.
Click to expand...

It is usually recommended to avoid even drive ratios so that the same spot on the chain is not hitting the same spot on the sprocket on a regular basis. That is why you typically see them being 1 or 2 teeth off an even number.


Mark
 
helmutholderbenz said:
What are you running in the rear? I'm running 15/ 45 which gives me 3.00 final which is pretty good all around but I'm wanting to do a little more open riding and was wanting to get in the 2.80ish range.
Click to expand...
IIRC I'm running 15 F and 40 R to get the rev's down at speed.Still pulls just fine and will start from a standstill in second if I want to abuse the clutch.
 
mmattockx said:
It is usually recommended to avoid even drive ratios so that the same spot on the chain is not hitting the same spot on the sprocket on a regular basis. That is why you typically see them being 1 or 2 teeth off an even number.
Click to expand...
That would not really affect anything because the chain typically has over 100 links and will not be a multiple of the tooth count on either sprocket.

.
 
Steve said:
That would not really affect anything because the chain typically has over 100 links and will not be a multiple of the tooth count on either sprocket.

.
Click to expand...

I would say the same thing, Steve, but I have mechanical design textbooks that say to not use even ratios. It's a much worse problem with gear sets, but chain drives also get the recommendation.


Mark
 
Steve said:
That would not really affect anything because the chain typically has over 100 links and will not be a multiple of the tooth count on either sprocket.

.
Click to expand...
I'm still trying to figure out how you get 1 or 2 teeth from an even number?
 
Steve said:
Instead of a 15/45 ratio (3.00), use a 15/46 (3.07) or a 15/47 (3.13).

OK, so 3 isn't really an "even" number, it's ODD.

.
Click to expand...

For chain wear, the only thing that matters, is the ratio of the either gear to the number of chain links not the ratio of the gears to themselves.
 
I just had the same ordeal with my bike. Used this handy calculator to help.
http://www.gearingcommander.com/
You pick your bike. You can change the tire, wheel size, and sprocket to see what effects it will have on the speed and rpm.
 
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