Negative dishing

Graham Steer <[email hidden]> wrote:
: I have been doing a quick a dirty conversion of an old bike for a friend who
: wants to try fixed gear riding. I have done all the usual things like
: mounting the chain wheel in the inner position of his double chainset and
: redished the back wheel to neutral. I am, however, still nearly 1/4" out on
: the chain line (inboard). The back wheel originally had a seven sprocket
: freewheel on it. The axle has plenty of room to use spacers to help centre
: the wheel in the spokes and I have taken full advantage of this. My question
: is can I reverse (negative) dish the wheel and if so by how much. I know I
: can change the hub or the bottom bracket and possibly the chainset but given
: I can lend him a chain and sprocket my friend does not want to spend any
: money at the moment just in case a fixie turns out not to be for him.

Yeah, check out http://www.fixedgeargallery.com/wheels/

- mark

I 'spose you can try negative dish. One possible problem is that the non-drive spokes may be too long to provide negative dish. There might not be enough threads left on them to tighten up the nipples much more. If that's the case, you can get the negative dish only by loosening the drive side and I don't recommend doing that.

Here are some other options...

1) If you have enough clearance between chainring and seat stays, add some spacers between the crank arms and the chainring. You might be able to move the chainring inboard by 2 or 3mm.

2) Put on a spacer before threading on the cog. An old english threaded BB lockring will work and can move the cog outboard by 2 or 3mm.