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February 8th, 2013, 01:33 AM   #1
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fs570 commuter whats the best sprocket combo help???

fs570 commuter whats the best sprocket combo help???

Hey guys how’s things,

I need to do new sprockets and chain tomorrow on my commuter berg motard

What's the best front and rear size sprockets to run

I am currently 13 – 38 that was factory standard

I find that at 60 km/h it needs to be in a gear somewhere in-between 3th and 4th, know what I mean???

how do i choose sprocket sizes to be comfortably be in gear at 60km

Would appreciate your advice
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February 8th, 2013, 06:47 AM   #2
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Re: fs570 commuter whats the best sprocket combo help???

Consider going to a 14T, as it wears a lot better and better chain life.

The 38T would then be a 41T to keep ratio similar. All that is still too high, so consider going up to a ~45T+ for better accel and cruising. There's no perfect gear, but you can improve on what you got for your conditions.

I currently have a 14x45, and can still do 100mph per gps. My friend has 15x48 on his FS.
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February 8th, 2013, 09:53 AM   #3
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Re: fs570 commuter whats the best sprocket combo help???

I used 15/41 or 14/41
Do'nt know what gear I use for 60 km/h...
I think 4th for 14t 15/41 4th gear wil be to low revs and 3 on the high side for cruising..
I just bought a new chain (+4 links=112) and wil use 41/43 rear sprockets 14/15 fronts
Mpg I get a good 140/145 km (90 miles+-) on 1 tank of fuel I do not ride superslow though
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February 8th, 2013, 02:12 PM   #4
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Re: fs570 commuter whats the best sprocket combo help???

Stock is 14-38 on u.s. bikes .I went with 13-40 which equals +6 on the rear.This brings 3rd and 4th gears to life and makes 5th and 6th usable.Your problem might be mapping , it smooths the power out alot .2cents Skred
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February 8th, 2013, 02:28 PM   #5
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Re: fs570 commuter whats the best sprocket combo help???

If your lookin for mileage buy an aprilia sr50 , a fs570 gets 30 mpg which aint bad for the fun it provides a hooligan.
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February 9th, 2013, 10:56 AM   #6
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Re: fs570 commuter whats the best sprocket combo help???

I like the mileage compared to my previous sumo bikes The fs 650 had a 1.5 liter bigger fuel tank but couln't go as far on 1 tank of fuel than the 570 before the fs650 I had a husqvarna smr450 that was realy shit fuel wise sometimes I ran out of fuel with less than 100km on the trip (reset 0 when fueled) not riding it very hard...
I pushed that bike 3/4 times
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February 9th, 2013, 12:07 PM   #7
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Re: fs570 commuter whats the best sprocket combo help???

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

The 570 is in the bike catalog there, just load it up and try different sprockets on. It's not the most ergonomic website around so it takes a couple minutes to figure out. It's worth it though.
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