Bicycles Asked by Cm7F7Bb on January 18, 2021
I have got a single speed bicycle (Pure Fix Original Series) and I need to remove the rear wheel to the replace the punctured tube. The rear dropout has adjustment screws (I am not sure if this is the right term but you can see them in the photo).
I have never removed the rear wheel of my bicycle since I bought it about a year and a half ago. I am not sure if I have to loosen the adjustment screws when I remove the rear wheel or if I have to readjust them when I put the wheel back. I would like to make sure that I do not mess something up when I remove and reinstall the wheel. So my questions are as follow.
Any help is much appreciated!
With a backwards-opening (track) dropout like you have, yes, you typically will have to screw them out to get the slack you need to remove the wheel.
They achieve a couple different things on a backwards opening dropout:
One of the deals with them is as the drivetrain wears, your chain will pick up just a little slack, so it's likely they're not in proper adjustment per se anymore anyway if they've been in place for a year and a half.
This all leads to the question of how to use them properly to get correct chain tension on a fixed gear or singlespeed. That is a good question and there is a lot written about it. The simple answer is that as you add tension to a chain on a fixed/SS drivetrain, there reaches a point where the chain begins to bind a little as you spin the cranks because all the free space in the internal parts of the chain is being taken up. You want to be just shy of that point, but still tight enough that it's physically impossible for the chain to derail and that the top run of the chain looks like a straight line from the cog to the ring. As you read different takes on how to define good chain tension, it's pretty common to see people site numbers for how much the chain should be able to wiggle up and down, but these are inexact at best because it depends meaningfully on the chain construction, chainstay length, etc. Use your tensioning screws to go to where you can feel it binding a little, then back off from there. Also while messing with them, always put a bit of oil or grease on the threads if they feel dry.
Answered by Nathan Knutson on January 18, 2021
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