Topic: Offset sprocket?

[scottly]

I hadn't considered the difference in the width of the swing arm, either. The off-set front sprocket is the easiest, least expensive way to go. With your mostly stock motor, the primary shaft bearings shouldn't be a problem.

[Retro Rocket]

I hadn't considered the difference in the width of the swing arm, either. The off-set front sprocket is the easiest, least expensive way to go. With your mostly stock motor, the primary shaft bearings shouldn't be a problem.

+1

[scottly]

To add to the database (K7 pictured):

[Gamma]

If anyone wants to machine 10mm off a carrier, I did it by removing the 4 sprocket studs (double nut method), and bolting an old sprocket on the inside face.  This allows you to put it in a lathe with a 4 jaw chuck.  Then counter bore down each stud hole as well to allow studs to go in far enough
http://i192.photobucket.com/albums/z293/galaxy8155/DSCF0059.jpg[/img]]
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http://i192.photobucket.com/albums/z293/galaxy8155/DSCF0058.jpg[/img]]

[MCRider]

Does the bike still have the 17 inch rear tire which I think is 77-78 or the earlier 69-76 18 inch rear? If it has the 17 then I would stick with the 18/48 combo.

Has the stock 17" rear tire.

I prefer a 17/48 combo for a little more pick up, without too much revs higher up. I converted my rear from an 18 to a 17. I did the math and with a /80 tire, the 18/48 -17" roughly equals a 17/48 -18". So I'd say you're good to go.

[climbingaz]

Yeah, after kicking around different ideas for the last day or so, I think I'm going to go with this:

18 tooth offset front sprocket from Cyclex - $70, ouch!
48 tooth rear sprocket
530 O-ring chain

Since I just bought some new tires for my ZRX, I'll probably wait a few weeks to buy the sprockets and chain....plenty of time for you or me to change my mind. 

[scottly]

Wow! $70 for the offset sprocket?? Maybe machining the carrier would be the best solution, considering Gamma's tip about using the sprocket mounted to the backside as an arbor to chuck it in the lathe?