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Wheels and Tires Wheels and Tires - Everything from brakes to sprockets

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April 3rd, 2016, 10:11 AM   #11
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Two reasons..umm, or maybe more.

Chain and sprocket wear is much greater when running a smaller countershaft sprocket.

Parasitic power loss from the chain having to bend more to get around the smaller cs sprocket.

You have more anti-squat with a larger rear sprocket.
It's easier to grasp if you imagine a really large rear sprocket, say a 56t... the chain will be pulling somewhat downwards on the sprocket, and it will press the wheel into the ground under acceleration.

Complete opposite scenario..imagine a 16t front and rear...
On acceleration, the chain is horizontal, and the chain is only spinning the wheel, there is no downward pull as with the previous setup. Less traction.

There's more to it than that I'm sure, and I'm probably under qualified to explain it, as I don't quite get it myself. But that's the gist of it.

A 16/48 is better than 14/42 because it looks cool.

Just kidding, the main reason is so you can swap fronts out without breaking the chain.
So you can ride single track one day, and go on a road trip the next day.

Depending on where your axle is located, you will be able to run a 14/50--15/50--16/50 with the same chain.

I still believe 16/48 would be too tall for a FE450, that's why I put the 50t in ^there^ for you. is a great site for determining what sprocket setups do what.
You may have to input your bike as an FE650e though (transmissions are the same as FE450e).
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April 3rd, 2016, 11:28 AM   #12
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Originally Posted by 650Pilot View Post
It won't stress the engine as much with 14/40, when you are on the highways.

Thanks 650Pilot, I actually thought that it was better on the chain to have a big front sprocket, good thing I asked
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April 3rd, 2016, 11:59 AM   #13
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
16/48 is 3.0 ratio, same as the stock Fe650 15/45. IMO tall for a Husaberg enduro anywhere. And even more so for the 450 with less torque. The 14/40 is even taller at 2.87. Its Probably Ok for highway use but not much off road IMO
I was very comfortable with the 15/48 3.2 ratio on my 650.

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Last edited by pollo; April 3rd, 2016 at 12:02 PM.
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April 3rd, 2016, 01:44 PM   #14
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I Ride: 2008 700FK, 2002 628FST
I run 16 45 on my 628

Average speed 30kmhr mostly use 3rd

I don't think the final ratio makes much difference to the engine.

The engine sees a combined ratio so as long as you are not always stuck in the "wrong" gear
it doesn't matter about the sprockets

Handling is affected by the size of the sprockets though
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Last edited by bushmechanic; April 3rd, 2016 at 02:27 PM.
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April 3rd, 2016, 05:38 PM   #15
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Interesting, I'm running 14/50 for single trail. Was thinking of going to 15/50.
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16t, clearance, fe450, issues, mechanic

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