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January 5th, 2014, 06:27 AM   #1
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Whats the best size sprocket to use on supermoto?

Just wondering what you guys think is the best size sprocket to use on a 450 supermoto, currently got a 44tooth and think it would be better with a smaller one to make it abit better top end
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January 5th, 2014, 07:49 AM   #2
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Re: Whats the best size sprocket to use on supermoto?

edit nevermind i was talking about 570
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January 5th, 2014, 08:06 AM   #3
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Re: Whats the best size sprocket to use on supermoto?

Have you had a look at http://www.gearingcommander.com/ ?

The interface is a bit daunting at first but it starts to make a lot of sense if you spend just a few minutes digging in.
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January 5th, 2014, 10:39 AM   #4
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Re: Whats the best size sprocket to use on supermoto?

I did have a look on that website but it made no sense to me haha!
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January 5th, 2014, 12:08 PM   #5
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Re: Whats the best size sprocket to use on supermoto?

15-40 on my FE 550 in SM trim, 14-48 in enduro trim.
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January 6th, 2014, 03:14 PM   #6
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Re: Whats the best size sprocket to use on supermoto?

Originally Posted by Bluto
15-40 on my FE 550 in SM trim, 14-48 in enduro trim.
How is it low down/top end? I have 44-13 at the min and top end is no good
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January 7th, 2014, 03:18 AM   #7
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Re: Whats the best size sprocket to use on supermoto?

I'm thinking of 42-15 from
44-13, do you guys think this will make much difference top end?
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January 8th, 2014, 03:29 AM   #8
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Re: Whats the best size sprocket to use on supermoto?

Different bike, 2005 fs650e, but I run 16-38 and can still do 3rd gear power wheelies.

For a 2005 fs450, the stock gearing is suppose to be 16-40. From what I can see on gearing commander, If you go from 13-44 to 15-42 you'll gain about 30-35km's on your top end, which is about 20mph

hope that helps
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January 8th, 2014, 12:25 PM   #9
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Re: Whats the best size sprocket to use on supermoto?

I think 15/42 will be too tall. It really depends on your intended use though.

If you ride tight twisties, or dirt or race on a kart track it is way too tall.

I had my 550 in sumo trim, I ran it 14/45 for a short time. It was really fun, and could get all my shifting done quickly, but it was screaming at 90 mph.

I really liked 15/45, it seemed near perfect.

My 550 revs nearly as high as your 450 does, and hit 100 easily, with that gearing.
It cruised nicely at 70-80 mph in top gear, and didn't have a big gap between 5th and 6th.

That's the biggest problem you will have running too tall of a ratio, the gap between 5th and 6th, as 6th is an overdrive.

It will force you to either go faster in 6th or slower in 5th. Or lug/rev it. It can be an issue at slower speeds also. For twisty tight 30-50 mph type rides, The gaps between the lower gears can be annoying, making you rev it out into the next corner. It's either wind it out or shifting up and down alot.

I think 15/42 will give you that gap issue. You might not be able to cruise at say 62 mph. It will either be lugging in 6th or revving high in 5th.

I figure if you already have a 44, you could just pick up a 15t and try it out.
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January 8th, 2014, 02:25 PM   #10
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Re: Whats the best size sprocket to use on supermoto?

I will try adding a 15 for now then an see how that is. Intended use is just general riding around roads, at the min i feel like i need a extra gear because it seems to scream too much in 6th, id like 6th to feel like 5th if that makes sense
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