5/8 offset sprocket measure question

Haybus wrote: Here's what I did. Clamped a straight piece of aluminum angle to the inner face of the rear sprocket, making sure to contact as much of the sprocket face as I could. Then measured the offset from the inner face of the front stock sprocket. Can't change where the sprocket meets the transmission so figured that was a good base. Came up with something larger then 5/8. Machined the cush drive hub to make the offset 5/8. Then made a spacer that was 5/8 minus the thickness of the 630 sprocket. Clamped it all together, back to the straight edge, and laid the chain on to verify alignment before making the offset sprocket. (Offset the wheel a few mm cause I have a 6" wheel, but don't tell anyone :sick: ).

Doesn't matter what sprockets you're using as long as you measure from the mount surfaces. If you're using different sprockets than you intend to use you'll need to account for that.

Hollywoodmx wrote: Ya my wheel is centered "currently".

This is the plan. Leon's going to make me a 19T 520 18mm (safest bet I figure, feel free to comment) sprocket. I'm going to run the skinny racing chain 18.5mm and I will tunnel the frame a little, f*ck it. I will then see how that lines up.

Say run 19/41 @520 for teeth? Thats close enough to stock and should get me extra swingarm clearance on both the front and the back that others have been worried about. I was thinking with the 57mm carb I probly could afford to reduce the gearing as I figure I will lose some throttle response in the initial RPMs but I'm a bit worried running the 40T due to clearance.

Hollywoodmx wrote:

Patton wrote: Who's on first? :lol:

Good Fortune!

Gets worse.. man this offset issue really has me computing..

520= 5.8mm
525= 7.05
530= 8.74
630= 9.5 (estimated)

That is with me measuring sprockets in stock which they are vortex sprockets.

Taken from the DID website, a 520 VM2 X-ring chain has a 22.95mm outside pin width, while their 520 VT2 X-ring chain is only 18.70mm.

Divide that 520 chain /2 thats 9.5mm, 18-9.5=8.5

the difference of the 520 rear 3.mm that would put me at 114mm .

Minus the 8.5 I can allow before tire rub that would put me at 105.5

105.5 - 85 = 20.5 = 51/64"

4mm over 5/8ths..Doh!

BUT since the 520 chain is thinner I can run 3mm closer to the frame than the 5/8s 530 offset sprocket so if I go with a 19mm offset 520 sprocket I will be 1mm of true which is good enough because I have done some rounding as well.

Leon where are you??? I need a 19mm offset 520 sprocket! :whistle:

531blackbanshee wrote:

leon