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Old 26-08-08, 10:19 AM   #1
olden mgroin
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Thumbs up Rear sprocket size?

hey all, don't know if this has been posted before, but would like to know how many teeth on standard rear sprocket, and does a larger sprocket give better acceleration. (just lookin for a cheap mod).


any help appreciated.
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Old 26-08-08, 10:40 AM   #2
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Default Re: rear sprocket size

44T for your faired bike
45T for a Naked

Yes larger rear sprocket will increase acceleration & reduce top speed

Alternatively std front sprocket is 15T & the opposite smaller front sprocket will increase acceleration & reduce top speed - it will have 3 times the effect, or equivalent to going up 3t on the rear.

You can always do both, just watch out chain lenth, eg 14T front would have no effect but 47T rear would need more links
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Old 26-08-08, 10:43 AM   #3
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Default Re: rear sprocket size

how much reduction in top speed are we talking, will it still pull 100+?
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Old 26-08-08, 11:08 AM   #4
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Default Re: rear sprocket size

Blue worked it out as 127 revs per tooth & I reckon one more tooth on the front reduces my revs by 500 in top.

So say your top speed now is 135 at 11,000 revs 3 Teeth up on the back would be 125 at 11000 revs (but maybe the engine will have enough power to rev higher as you are going at a slower speed?)
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Old 26-08-08, 11:31 AM   #5
olden mgroin
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Default Re: rear sprocket size

thanks stu very helpful, larger rear sprocket for me then.
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Old 27-08-08, 08:57 AM   #6
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Default Re: rear sprocket size

I read about changing the front sprocket in this months RIDE magazine, and they say it will make a considerable difference. Has anyone on the org actually done this, and is there a big difference in the pull off? would I need to do the reverse of more teeth on the rear - by shortening the chain with this mod?

I assume this mod is like putting lighter rollers in the variator of a scooter, thus giving higher revs and giving more bite? It's nice to read about things like this, but I'd prefer 'hearing it from the horses mouth' so-to-speak.

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Old 27-08-08, 09:21 AM   #7
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Default Re: rear sprocket size

Quote:
Originally Posted by Stu View Post
Alternatively std front sprocket is 15T & the opposite smaller front sprocket will increase acceleration & reduce top speed - it will have 3 times the effect, or equivalent to going up 3t on the rear.
Just a bit of due warning about doing this - reducing one tooth on the front sprocket greatly increases the wear on the chain, and front sprocket - and therefore the rear chainring as well.
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Old 27-08-08, 03:05 PM   #8
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Default Re: rear sprocket size

I changed the rear sprocket to 46T......can't say I noticed a discernable difference in acceleration. However, I preferred the way the bike rides with the standard sprocket if that makes any sense. When the 46T wears out, I'll be dropping back to standard I think.

Probably everyone else on the org will disagree with me though.....horses for courses and all that
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Old 27-08-08, 05:15 PM   #9
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Default Re: rear sprocket size

1T up on the rear is hardly noticable! I'd go to a 14T on the front for any noticable difference, and the wear isnt that much faster than the standard 15T. I depends how well you look after your chain too.
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Old 27-08-08, 06:41 PM   #10
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Default Re: rear sprocket size

46T on a pointy is two teeth up aint it
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