tag:blogger.com,1999:blog-2862259736054019035.post8343336755070518172..comments2013-03-10T22:50:45.562-07:00Comments on Pacific Coast Cycles: Some general principals that apply to bicycle mechanics:chueyhttp://www.blogger.com/profile/10392002038890669070noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-2862259736054019035.post-12587825017573215372009-11-16T20:33:17.327-08:002009-11-16T20:33:17.327-08:00Fatmex, thanks for the good questions.
On the hub...Fatmex, thanks for the good questions.<br /><br />On the hub, the axle is one piece with two ends. Both ends are adjustable but in practice you jamb nut one end (lock it) and then do the adjustment from the other end. It doesn't matter which side you lock and which side you choose to adjust. If one side would be easier for some reason such as a freewheel or access, it is only important that both sides are locked. The distance between the cones is what you are adjusting.<br /><br />Play in QR hubs is just a tad. If you have a vise and the wheel is held by the axle or locknut, you should be able to just percieve play at the rim. I check that thusly: left hand index finger and thumb holding the top of the axle (Remember it is suspended horizontally in the vise); right hand out at the rim, move the rim up and down, which is equivelent to sideways if it was on the bike. You should feel just a tiny bit of play. Final test is that the play should be taken out when the QR is tightened on the bike. Ideally, the wheel will swing back and forth easily when the valve, which is the heavy point, comes to and passes the bottom.<br /><br />The star nut is there only to facilitate taking out the play from the headset. You are correct that the stem does the work of holding that adjustment. The same thing could be accomplished without the star nut. There would need to be some other method,for instance a clamp, temporarily used to snug the play out of the bearings, or a threaded rod, some washers and a couple of nuts could be used inside the steerer and then removed after you tighten the stem to hold the correct adjustment. Note: even though those methods would work, they are given in the hopes that they clarify the job done by the star nut.<br /><br />Chuckchueyhttps://www.blogger.com/profile/10392002038890669070noreply@blogger.comtag:blogger.com,1999:blog-2862259736054019035.post-27765446868763320182009-10-16T07:53:42.496-07:002009-10-16T07:53:42.496-07:00Chuck,
I like the VW valve adjustment analogy.
...Chuck,<br />I like the VW valve adjustment analogy. <br /><br />I hope this doesn't sound like a stupid question: Is the hub adjusted from one side only or both? <br /><br />If you had to put a measurement (in inches or mm) for the play needed with QR hubs, what would you say it should be? <br /><br />On threadless headsets, I don't understand how the star nut works or why it's needed. Doesn't the stem do all the work holding the steerer? Again, please forgive me if this seems like another stupid question.Ciclistahttps://www.blogger.com/profile/09086219690773136602noreply@blogger.com