Forum

[Ian W]

Hi all, I need to down gauge my chain size (530) for a narrower chain (520), (special build bike / bullet gearbox), can anyone tell me what gauge sprocket the model g used and if it fits the bullet box. Also what sizes are available?

Thanks for your help.
Ian W

[Ian W]

Follow up on the chain / sprocket size needed.


520 (5/8" x 1/4") which is 3mm narrower than the 530 (5/8" x 3/8")

If I can get a gearbox sprocket to suit then it looks like I'm sorted.

Is the model g 5/8" x 1/4"?

[p]

Should be easy enough to find someone to face off a standard sprocket to the narrower dimension on a lathe, I don't expect Indian material will be very hard! You would only need to turn down just below the teeth and you could choose one side or the other - or a bit off each side, in order to get the chain run you need.

[Ian W]

That's a very good idea, thank you.

But the wallies down here will charge more for the metal work than one would cost from new.

[John J]

Why not use an angle grinder and do it your self. The tollerances are not very tight.

[Ian W]

Yes could do, may have to if they dont make a 520. I need sprockets for my other bikes anyway so I may as well get the right thing if it is available.