front sprocket with flange

[twocool]

Which way does the front sprocket install?

With the flange inward or outward?

Can't find a good photo or drawing which shows this..

Cookie

[ace50]

Last I looked, the snap ring on outside is on a flat surface, so I'd say flange on inside.
Someone needs to confirm this though.

[gsJack]

Hub (shoulder) inward is correct.

[twocool]

Thanks,

That is the way the one I took off was.   And chain aligns nicely.

Couldn't find any good drawing or photo in the repair manual or in the micro fische...I think they all still show the older non flanged type sprocket..

Old front sprocket was some cheap aftermarket...never ran smooth since new, and that was with new chain at the same time!   It is all worn on one side...and really loose on shaft.

I replaced with JT sprocket and D.I.D. VX2 chain...changed rear sprocket with JT also, even though it didn't need it...

Runs really smooth now!

Cookie

Flange inward is correct.

[rexpepper651]

aww boo this means i put mine on wrong  the one on the bike had no flange.

[robfriedenberger]

I doubt that the flange is going to take much life off of your chain....might make a little more noise but I think wear should only be slightly accelerated if any at all.

[twocool]

?

If the sprocket is installed correctly, the flange will have nothing at all to do with wear...It is a matter of spacing..

If installed the wrong way round, the chain alignment will be impossible, and the wear will be great...

Earlier years do not have flange at all...so it doesn't matter...

I got 20,000 miles out of the original sprocket, and 20,000 miles out of the first replacement sprocket...not bad?

The replacement was worn all on one side, the teeth were not hooked, it was just worn all on one face...indicating improper chain alignment?  But this was cheap off brand...I tried to align chain many times and it always ran rough...

JT sprockets front and back with DID VX2 chain runs smooth right off the bat...expecting another 20,000 miles

Cookie

I doubt that the flange is going to take much life off of your chain....might make a little more noise but I think wear should only be slightly accelerated if any at all.

[gsJack]

I changed the word flange to hub or shoulder in my post above to maybe make it clearer to someone using this thread for future reference.  The part of the 94 and later front sprockets that projects inward has more commonly been referred to as the hub or the shoulder.  When the hub was added to the front sprocket between 93 and 94 a shoulder on the tranny shaft was cut back and a spacer was shortened to accommodate the hub.  The sprocket teeth remain next to the snap ring the same distance from the bike centerline on all years.

My experience with front sprockets with and without the hub is related in this thread linked below, I think the hub was added to reduce tranny output shaft wear caused by misaligned of the rear wheel.  I would be concerned about a sprocket with hub being put on backwards.

http://gstwins.com/gsboard/index.php?topic=63393.msg751235#msg751235