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Old 08-16-2009, 09:23 AM   #1
olec OP
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Using 520 rear sprocket on a 525 chain...

I'm a little confused.

I bought a 48t rear sprocket from KTM Twins for my SE. I was thinking 16/48 is a good combination for my riding. It was listed under SE parts, and the bolt holes are in the correct dia.

But I'm a little dissapointed, because its both made of alu, and the thickness is obviously made for a 520 chain. I measured it and compared to a 50t sprocket made for the EXC's, and they are the same thickness.

So, what will happen if I mount this 48t and still use the 525 chain and the 16t CS which fits the 525 chain? Will I get problems?

If its not a match, I guess there are some 525 to 520 converters out there. What are the pros and cons changing out everything for a 520 system?

Thanx!
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Old 08-16-2009, 10:01 AM   #2
DieselDog
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520 Sprocket

Let me preface that I'm not a guru and I'm just regurgitating the tribal knowledge. The 525 chain supposedly has the same pitch as the 520. The 525 chain has thicker side plates. There is a belief that the 520 chain has lower frictional losses and some racer types switch to 520 for this reason. The 520 chain is rated for a lower displacement/HP bike. I suppose lower frictional losses may be a reality if the pin size is smaller but according to DID info the only difference is the side plate thickness. The problem with 525 is it is not as readily available and many stores don't stock 525.

For me, if OEM is 525, that's what I want for replacement.
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Old 08-16-2009, 02:32 PM   #3
olec OP
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Quote:
Originally Posted by DieselDog
Let me preface that I'm not a guru and I'm just regurgitating the tribal knowledge. The 525 chain supposedly has the same pitch as the 520. The 525 chain has thicker side plates. There is a belief that the 520 chain has lower frictional losses and some racer types switch to 520 for this reason. The 520 chain is rated for a lower displacement/HP bike. I suppose lower frictional losses may be a reality if the pin size is smaller but according to DID info the only difference is the side plate thickness. The problem with 525 is it is not as readily available and many stores don't stock 525.

For me, if OEM is 525, that's what I want for replacement.
No questions about strength etc. But what will happen if I use a much thinner rear sprocket with the 525 chain? When mounted, the chain moves sideways on the sprocket / teeth, and I have a feeling this aint no good. IF KTM Twins sent me this sprocket to be used on the SE w/o changing to a 520 chain, then its all good, but I wanted to check with you first.
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Old 08-16-2009, 04:07 PM   #4
CodyY
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How much lateral play? If it's just a few .00's I wouldn't worry about it.

Oh, and the SE/ADV require a different sprocket than the RFS/LC4 bikes altogether. Sounds like it's the right parts to me.
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Old 08-17-2009, 07:58 PM   #5
Q500
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Aluminum rear sprocket will wear out about as fast as your rear tire FYI.
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Old 08-17-2009, 09:23 PM   #6
PowerCell
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Quote:
Originally Posted by Q500
Aluminum rear sprocket will wear out about as fast as your rear tire FYI.

True words... send it back
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Old 08-17-2009, 09:58 PM   #7
Bill English
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520 sproket

Just say no.
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Old 08-18-2009, 01:22 AM   #8
olec OP
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Quote:
Originally Posted by PowerCell
True words... send it back
I think I will. But do you know if it exist lets say a 48T rear sprocket made of steel for the SE?

This one is made by supersprox. Its alu and it fits the SE. But its so much thinner than the stock and i GUESS its a sprocket made for a 520 chain.

Anyway, I will not put it on bc I will very quick go out of synch between wear on CS, chain and rear sprocket if I'm gonna replace rear sprockets much more frequent than earlier. Its no good for the chain either.

EDIT: I just went out and measured things. A 520 chain is approx 6.5mm 'wide' and the 525 chain approx 7.9mm. That's a difference of 1.4mm. I also tested this 48T SE alu sprocket on the 525 chain, and yes there is much more sideways play than with the stock sprocket.

olec screwed with this post 08-18-2009 at 01:41 AM
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Old 08-18-2009, 09:35 AM   #9
brents347
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Call KTM twins direct and then let us know what they say about it.
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Old 08-18-2009, 10:41 AM   #10
PowerCell
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Ironman...

You should consider the Ironman sprockets.

http://www.dirttricks.com/

THey don't show an application on their website just yet, but will have them available in about 4 weeks.
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Old 08-18-2009, 03:11 PM   #11
ryanwilliamcantrell
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Quote:
Originally Posted by PowerCell
True words... send it back
+1 ~ and... when it goes, it starts snapping teeth off very quickly. Very bad.
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Old 08-18-2009, 03:24 PM   #12
kennyd
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iron man sprockets in stock now

iron man sproockets 525 hi tensile steel in 42t and 45t in stock now! www.alternatecycle.com 2 oz more than aluminum sprockets outlast 3 times!
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Old 08-18-2009, 05:21 PM   #13
mookymoo
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Quote:
Originally Posted by kennyd
iron man sproockets 525 hi tensile steel in 42t and 45t in stock now! www.alternatecycle.com 2 oz more than aluminum sprockets outlast 3 times!
Quote:
Originally Posted by PowerCell
You should consider the Ironman sprockets.

http://www.dirttricks.com/

THey don't show an application on their website just yet, but will have them available in about 4 weeks.
PC is referring to the 47T ... which is closest to the 48T that Olec is after...

BTW, Im led to believe that Renthal now sell a 15T countersprocket for the ADV/SE ...

15/47 ....
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