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I'm changing out my front and rear sprockets along with a new 0-ring chain. The PO told me the chain was kinked (it is), since I'm replacing that I'm going to a 15/50 sprocket set also. I managed to score a 15t Sunstar front, 50t JT rear and an RK o-ring chain on Amazon for about $100 shipped.



One thing different about the JT rear over the OEM is the indent in the sprocket and the indent faces outward. Now....the factory retaining clips overlap the indent on the JT sprocket. I'm going to go with slightly shorter new grade-8 bolts or washer out what is there. Question is, install them and the torque will make them conform to the indent?



Am I correct on that? I searched the old and new site, but couldn't find a definitive answer.



Pic is for reference, bolts aren't torqued down.

 

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That's what I do. Just line up one of the flats with the edge of the indent, then torque down. I don't bother the bend the other side of the safety tab up anymore, either.
 

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I installed my JT sprocket the other way, indent in.


me too





i got 5/16" bolts with nylock nuts and 2 washers to make sure i didn't run out of thread

 

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That's bass akward. Chain's out of alignment. Might not be real apparent, but it am.
 

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I positioned and torqued mine the same way as Matty Moo and Lizrdbrth. No problems thus far.
 

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if it's off it's not off that much and if it's wrong then the dual sprocket guys are way off...but i think you're right...the tooth number should be facing out...i just liked the way the bolts and clips seated on the flat side better so it's staying that way

http://tw200forum.co...procket-thread/





That is exactly what I did with the exception I didn't place a washer between the inner sprocket and hub. For sure both sprockets out of alignment but I had zero problems. Of course I kept the chain clean and well oiled all the time.
 

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i guess the thing i should have done is put washers on the inside equal to the indent in the sprocket...but i'm not too worried about it since the guys running the outside dual sprocket would be off much more than i would be and they aren't having any problems
 

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I emailed JT sprockets and this is what they said:



"Bryan



For the TW (I checked 2000 and 2009) the sprocket appears to mount with the flat side out.



I have no experience with the TW so I am just going from the fiche on this. I would "eyeball" to check for parallel before finishing installation but flat side out should be correct.



Regards,



Richard"



I figure that as long as your chain and sprockets are lined up, it doesn't really matter what side faces out.
 

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so confusing...couldn't they just put a rotation arrow on the sprockets like they do with tires...i poked around on their site and found no installation guides for any bike...i wonder if the fiche he was talking about is only "in house"
 

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I just put one on, with the recessed side out. Two washers under the clips and I could use the original bolts.



(first post by the way.)
 

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Given the fact the lock nuts on the back are free to 'walk off' if they so choose the safety tabs on the front don't really do anything in my opinion. Therefore I put them in a drawer and my JT sprocket is mounted with the dish facing outside (like it should.) I needed to buy washers to space out enough that the lock nuts could still have threads to hold the sprocket tight to the hub. I'm not sure why JT felt the need to waste money machining the sprocket unless it fits some other bike that requires it.



If you're one of the OCD types, you can drill the bolt heads for safety wire.



http://2.bp.blogspot.com/-iw98yKrwji8/UQG6k4FjfNI/AAAAAAAAA7E/74y69Nz9Ed4/s1600/Safety+Wire.JPG



But.... the lock nuts still just sit there on the other side, not locked into place. On all of my other bikes, the bolts are studs, kind of like a car hub and you only have the nuts to worry about (with the safety tabs holding them in place.)



Honestly though, I imagine you'll know if you ever start to have a loose sprocket. You could drill the bolts at the ends of the threads and safety pin them as well.



Long answer to my short issue. I simply chose to put the safety tabs in my parts drawer.
 

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...... I'm not sure why JT felt the need to waste money machining the sprocket unless it fits some other bike that requires it.


They do it to shave a bit more weight. Kind of a nice touch considering most outfits charge just as much or more for their "chunkier" versions, some of which are completely solid (no lightening holes er nuttin') and weigh almost twice as much.



Considering the fact that we have one of the heaviest wheel and tire combinations in existence every little bit helps
 

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Shouldn't the manufacturer have the final word?

I'm about to install this same sprocket & not looking to step on any toes here, but wouldn't it be fair to say the company that built the darned thing should have a pretty good idea which way it should face once installed? YMMV/personal preference & all, I know, but I want to make sure I'm doing it right.

Thanks for sharing your correspondence with JT sprockets, Rainman...

-TIA

I emailed JT sprockets and this is what they said:



"Bryan



For the TW (I checked 2000 and 2009) the sprocket appears to mount with the flat side out.



I have no experience with the TW so I am just going from the fiche on this. I would "eyeball" to check for parallel before finishing installation but flat side out should be correct.



Regards,



Richard"



I figure that as long as your chain and sprockets are lined up, it doesn't really matter what side faces out.
 

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I'm about to install this same sprocket & not looking to step on any toes here, but wouldn't it be fair to say the company that built the darned thing should have a pretty good idea which way it should face once installed? YMMV/personal preference & all, I know, but I want to make sure I'm doing it right.

Thanks for sharing your correspondence with JT sprockets, Rainman...

-TIA
You'd think JT would know. Members here have installed the sprocket both ways and one doesn't seem to be better or worse than the other. Just make sure the bolts are tight.
 

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Thank you guys. Honestly, responses are so helpful & prompt here, it makes me think you all may need to get out & ride more! (unless of course, you're posting trailside from a handlebar mount). Cheers, -K-
 

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Ski Pro 3, you seem certain of your opinion. You can believe what you want about JT sprockets but I disagree, they make quality stuff. Even the Awesome power ;) of the TW has no chance in hurting a thinner sprocket with holes.
 

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I don't think that your understanding of mechanics is faulty. A solid sprocket is going to be stronger, but I think that it is still plenty strong even with the metal removed. Many sprockets on the bikes I have had over the years had metal removed for weight reduction. I do prefer the reduction in weight over a solid, heavier sprocket. You made good points in favor of a solid sprocket and I can't fault anyone for choosing to go that route.

I also agree that the recessed side should be facing away from the wheel for proper chain alignment.
 

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the question is have you ever seen a sprocket fail due to one of the holes?...doubt it...and there are probably extra holes in them cause the same sprocket will fit other bikes as well...mine is flat side out...no problems yet
 
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