On Mon, 04 Aug 2003 15:35:53 GMT, Jim Edgar <[email hidden]> wrote:
😄an Musicant at [email hidden] wrote on 8/4/03 7:41 AM:
:
:> Never had a problem with this bike before, a Miyata 12 speed I bought used in like-new condition
:> about 3 years ago. It's a basic road-commuter bike, nothing fancy, but it has a decent
:> triple-butted frame and I've taken to daily 12 milers up in the hills (about 1000 foot
:> elevation).
:>
:> I had a blowout on the back and changed the back tire about 3 weeks ago and got a flat a couple
:> days ago from a staple but I noticed that the left-most wall of that new tire was being abraided
:> to the point where the nylon belting could be seen in places. Looking, I conclude that this could
:> only be caused by the tire rubbing against the left chainstay. I looked and saw an adjustment
:> mechanism on the left side where the dropout seats at the chainstay and I adjusted this with a
:> screwdriver so that the wheel would "want" to seat so that it's properly aligned. Things seemed
:> fine and I put on a new tire, thinking that the abraided tire wasn't safe for the daily steep
:> descents I do. However, I soon noticed that the tire had moved over very near the left chainstay
:> again. I readjusted the stop with a screwdriver, and tightened it down hard. Yesterday, while
:> climbing, I noticed a sound and realized that the tire was rubbing against the stay again! I
:> jumped off the bike and twice had to retighten the dropout.
:
:I assume you mean tighten the quick-release; the dropout is where the axle :seats on the frame.
Just to say the obvious - quick releases are camming :mechanisms, not screw mechanisms.\
Yes, I meant tighten the quick-release. The term "quick-release" was eluding me.
:
:> I kept an eye on it the rest of the ride and it seemed to me that the tire was getting
:> dangerously close to the chainstay again but I made it home. That was with my weight on the bike.
:> This morning, it looked like the tire is aligned correctly, and this is when I'm not on the bike.
:> Can anyone shed some light on this vexing problem? Thanks!
:
:
:Also assuming you have dropouts which are horizontal (or nearly so), and you :were turning the
adjustment screw on the dropout, so you could pull the axle :back against a solid reference point
I was turning a screw (machine screw) that had purchase on the other side by a nut-like piece and
this assembly seemed to function as a stop for the axel (and there's a like one on the other side,
I believe) so that the wheel will have solid support on both sides when it's centered. Why it
suddenly needed adjustment, I don't know, but a clue may be the fact that there's evidently
something wrong with the wheel. It doesn't spin freely. A tooth is broken on the freewheel and I
just bought another freewheel (7 sprocket, whereas my current one is 6, but the guy at the store
said it would work and make my 12 speed a 14 speed, although the high and low sprockets are still
14 and 28 tooth), and I will disassemble the wheel hub and inspect the bearings and repack,
readjust or replace, etc. as required.
:
:You might check the hub cones for proper tightness, and also the axle for :possible bending or
breaking. If you are properly closing the rear :quick-release, it shouldn't be moving in the
dropouts. Of course, if there :was excessive layers of slippery paint on the dropouts, it might
slide :forward under pedaling pressure, if it can't get a decent "bite".
:
:Hope that helps,
:
:-- Jim
Thanks. Yes, the cones I will inspect and readjust or replace as required. I've never touched any of
the bearings on this bike, which was lightly used until about 3 months ago and now I'm using it
quite a lot.
Dan
