Bike maintenance day
Nov. 3rd, 2007 02:43 pm![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png){kind=small}
johnridleyI did some long-overdue maintenance on the bike today.
Built a new wheel last night with a Shimano Deore XT hub with 6 bolt ISO disc brake flange, an Alex Adventurer 700c rim and Wheelsmith 2.0 spokes. I reused nipples from a previous wheel because, well, I'm cheap and this wheel already cost half what the whole bike did.
Today I couldn't find the 21/64 drill bit to drill out the valve hole for Schraeder, so I just put a presta tube in for now. Moved the tire over, mounted the wheel and rode it a few hundred feet.
All was OK, so I put the disc brake caliper on, spun the inner and outer adjustment wheels to almost touch, cut a new bit of brake cable with the dremel tool, and hooked it all up. That all worked OK, so the old brake calipers and cable went into a ziplock and into the bike parts box.
Then I took the rear wheel off, restrung one spoke that I think was the one I replaced after it got ripped out in an incident a year or two ago (I had strung it over rather than under the 3rd crossover) and then I retrued the wheel. I wasn't able to get it really super true because some of the nipples are about frozen on the spokes and are a bit rounded off, but it's acceptable.
Then I addressed the bad shifting; somehow the cable had TIGHTENED - I had no idea how that would have happened, but anyway I readjusted the shifting (first time I've EVER had to do that) and got it shifting right again. Then as I was putting everything back, when I put the pump on the frame I noticed that the pump bracket had pushed the shift cable to the side when I rotated it when I decided to put it on the side of the downtube a few days ago. Snapped it back where it was supposed to be, and of course then the shifting was screwed again. So I took up the slack in the shifter adjuster and called it good.
I still have a bottom bracket to put on, which won't take much time, but I've got other stuff to do and the bottom bracket is just making noise, it's not significantly affecting the ride.
Comments: That disc brake is really noisy. But even after a dozen or so braking cycles it's quieting down, and I'm assuming it'll be OK soon.
Built a new wheel last night with a Shimano Deore XT hub with 6 bolt ISO disc brake flange, an Alex Adventurer 700c rim and Wheelsmith 2.0 spokes. I reused nipples from a previous wheel because, well, I'm cheap and this wheel already cost half what the whole bike did.
Today I couldn't find the 21/64 drill bit to drill out the valve hole for Schraeder, so I just put a presta tube in for now. Moved the tire over, mounted the wheel and rode it a few hundred feet.
All was OK, so I put the disc brake caliper on, spun the inner and outer adjustment wheels to almost touch, cut a new bit of brake cable with the dremel tool, and hooked it all up. That all worked OK, so the old brake calipers and cable went into a ziplock and into the bike parts box.
Then I took the rear wheel off, restrung one spoke that I think was the one I replaced after it got ripped out in an incident a year or two ago (I had strung it over rather than under the 3rd crossover) and then I retrued the wheel. I wasn't able to get it really super true because some of the nipples are about frozen on the spokes and are a bit rounded off, but it's acceptable.
Then I addressed the bad shifting; somehow the cable had TIGHTENED - I had no idea how that would have happened, but anyway I readjusted the shifting (first time I've EVER had to do that) and got it shifting right again. Then as I was putting everything back, when I put the pump on the frame I noticed that the pump bracket had pushed the shift cable to the side when I rotated it when I decided to put it on the side of the downtube a few days ago. Snapped it back where it was supposed to be, and of course then the shifting was screwed again. So I took up the slack in the shifter adjuster and called it good.
I still have a bottom bracket to put on, which won't take much time, but I've got other stuff to do and the bottom bracket is just making noise, it's not significantly affecting the ride.
Comments: That disc brake is really noisy. But even after a dozen or so braking cycles it's quieting down, and I'm assuming it'll be OK soon.
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no subject
Date: 2007-11-04 09:16 pm (UTC)Bent derailer or dropout (or hook, if it's one of those.) You're right that it is usually cable slippage and stretch that causes over time shifting issues, but the #2 cause is pranging the derailer. The usual sign of this is you can't get it to shift well across all the gears.
The simple check -- for almost all derailers (there are some Campys that are odd about this...) the shifting pully and idler pully should be in the same plane, and that plane should be congruent with the chainline at neutral.
Mountain deraliers, designed with longer chainwrap for lower gears, suffer this more than road deraliers, because the idler pully is hanging out farther.
no subject
Date: 2007-11-04 10:58 pm (UTC)I put the bottom bracket on today. The new one is the cheapest I could buy and is still a noticeably higher quality BB than what the bike shipped with.