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I have a Surly Cross-check that I absolutely love and adore to pieces. I've also converted it from a geared bike to a fixie and am wondering if I still need the adjustment screws (see picture, in case you don't know what I'm referring to).

The issue I have right now is that my chain is a bit slacker than I want it to be, but with the current position of the adjustment screws, I can't move the rear wheel any further back in the dropout. Are the adjustment screws necessary at all on a fixed-gear bike, or are they only needed when you've got a derailleur system? I'm a bit clueless on them, this is the first non-vertical dropout bike I've owned.

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up vote 6 down vote accepted

They aren't necessary, but they are a great help to properly aligning your wheel in the dropouts in an efficient manner. If these screws are adjusted correctly, you'll be able to just put your wheel in, pull it all the way back and tighten your axle nuts and your wheel will be arrow straight in the frame. If not, You'll need to manually align your wheel each time you take your wheel off to change a tire or do maintenance.

To solve your chain problem, you can either adjust the screws out so you can get your wheel further back in the dropouts or you can remove a link or two in your chain.

Either way, you want to make sure that the axle nuts have a good bite on your dropouts. This means that the entire nut is in contact with the dropout (save for the portions that are aligned with the openings)

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Hm, I actually hadn't thought of using them as an alignment guide that way. Getting the wheel set properly and then adjusting the screws in place so that I can just fit the wheel in against them the next time is probably a better idea than removing them completely. Thanks! –  Scottie Sep 24 '12 at 16:32
    
This is actually not a great idea on a single speed bike that depends on axle position to maintain chain tension. Since you have to move the wheel back as the chain lengthens, you'd have to be adjusting these screws to do so. –  user973810 Sep 24 '12 at 21:10
    
How often is that going to be an issue? Chains don't stretch out that quickly. –  Scottie Sep 26 '12 at 7:18
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