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I have a single speed bicycle which has a spacer screw that controls the position of the rear wheel and hence the tension of the chain.

The screw goes through a small hole in the frame, which is threaded, and in to the drop out area. With the pair of screws at a level pegging, the proper position the wheel is assured and the chain tension is maintained.

What is the name of this part? I've bent one of my screws and need a replacement but can't find a hit on "rear wheel spacer screw."

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up vote 2 down vote accepted

Dropout adjustment screw. Here's a thread from the Bikeforums with some links and such to check:

http://www.bikeforums.net/archive/index.php/t-274077.html

Unfortunately they do not appear to be standard... You might try haunting more established shops to look through their old-parts boxes. Most hardware stores carry a very wide variety of metric fasteners; you might be able to find a suitable screw there

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Or find an industrial bolt supplier. That's where bike shops get many of their bolts. You will pay a premium for a small quantity (like, one) but it will probably still be cheaper than the bike shop charges. And they will have it on the spot. –  Мסž May 8 '11 at 0:11
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