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@A_EF
I'm building a wheel on a fixed / free flip-flop hub. One side will be a Shimano freewheel and the other a Surley / Andel fixed sprocket.
Looking at Sheldon Browns table for those sprockets, I'm going to have a few mm difference between the two side.
from http://www.sheldonbrown.com/chainline.html
Chainline
(From Shoulder) for 3/32 sprockets
Surly = 6.4mm
Shimano = 7.89mm
so that's 1.49 mm difference.
Trying to sort chainline so that it is good for both sides and havea few options.
** Option one* is to move the axle and dish the wheel very slightly so it sits centre in the frame and also places the sprockets same distance from the lockring nuts, hopefully with a good chainline to match chainring, or I'll need to adjust chainring too. This seems quite a convoluted method and if I then change either sprocket fro another brand with a different shoulder I have to go through the process of redishing again to line eveything up.
**** Option two*** is to put 1.49mm or near as possible of spacers behind the Surly side and then adjust front chainring out to keep in line. Only concern about this is moving the sprocket away from the centre of the hub might bring it too near or over the edge of the thread? Is this normal. This solution does seem simpler though and more easily adjustable in the future for swapping sprockets.
**** Option four*** is to set it up so they're both 0.75mm out, and go for something in the middle. Doesn't sound great through as it wil never be perfect.
Hoping that those figures on Sheldon's site are correct too as looking at the hub with the Shimano it actully looks like it's going to sit more like 4mm further out, which would bring the Surly sprocket option 2 even nearer or further over the fixed thread edge to match up.
Going for 3/32 chain as I may need it to be more forgiving.
Anyone been through this, have advice and experience or any other solution?