What wheel and sprocket do I have?

[millrace]

Hello, I have a project 1977 650XS street tracker that I have been working on. The bike, when I bought it, was already a project. I have not ridden it.

I am in somewhat of a dilemma on what wheel and sprocket I have.
It came with an 18 x 2.18 alloy rear wheel with disk brakes. It has a 42 tooth sprocket attached with 4 bolts. The brake caliper lines up with the rotor and the rear brake seems to work well on the stand.
Does anyone know what wheel and sprocket This is? (see picture)
I need to get down to a 34 tooth sprocket. Does anyone have a recomendation?


There appears to be a mis-allignment between the front and rear sprockets. The rear is inboard by about 1/4 inch. Will this cause a problem?

I do not even know if it has a XS650 swingarm. Is there a way to tell?

Thanks, any help will be appreciated.

 

[justin]

Swingarm looks stock, as does the brake caliper/rotor. Haven't seen that bolt pattern before on the sprocket. looks like its from a smaller bike though (4 bolts). Easy enough to buy a sprocket blank and drill out your bolt pattern... 32 tooth sprocket blank

For $20 thats the way i would go, if you cant find one obviously.

 

[650Skull]

XS400 or SR500, I'm not sure. Here is a thread on the Garage where i asked the Question and got some good answers.

 

[justin]

^beat me to it it looks like the xs400 sprocket is your match. heres something regarding your spacing...spacing thread

 

[650Skull]

XS400 or SR500, I'm not sure. Here is a thread on the Garage where i asked the Question and got some good answers.

Found the thread that shows how to do the full conversion HERE

 

[millrace]

Great info, thanks. I think the spacer route with a XS650 sprocket is the way to go. Any idea what I can use as a spacer or do I make one from scratch? How about a cut down XS400 sprocket if I can find one without the cutouts?

 

[650Skull]

Did you read the thread............. It shows you the dimensions and thickness of the spacer

 

[millrace]

I am with you. I was just trying to save a step or two as the XS400 sprocket is 3/8 inch wide and it already has the center hole and 4 bolt holes already drilled. Thanks again for the good info.

 

[BigBoreSwede]

Hi.

I also have a 18" rear mag wheel but it´s a FRONTwheel from the XS400 with an homemade adapter for the sprocket. Mesure it if the spokes are thinner then a stock front wheel (xs650). Mine are

/BigBoreSwede

 

[millrace]

I do not have the tools available for me to fabricate the adapter or accurately drill the XS650 sprocket for the XS400 alloy wheel. Can anyone recommend a machinest that would do this? I live in the Long Beach, Orange County CA area. Thanks, Millrace