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Search: Posts Made By: zzyzx_xyzzy
Showing results 1 to 50 of 803
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Forum: Bicycle Mechanics
08-20-11, 01:37 PM
Replies: 30
Views: 8,546
Posted By zzyzx_xyzzy

I would add that a feeling of being "pulled too...

I would add that a feeling of being "pulled too far over" can come down to saddle position (too far forward or tilted down) as much as handlebar position.
Forum: Bicycle Mechanics
08-18-11, 06:20 PM
Replies: 16
Views: 9,490
Posted By zzyzx_xyzzy

This is pretty high on the effort scale but I...

This is pretty high on the effort scale but I made one by brazing a cog taken from a multispeed freewheel to a standard gearhub cog. It works but if I were doing it again I'd be more careful about...
Forum: Bicycle Mechanics
08-03-11, 04:13 AM
Replies: 3
Views: 532
Posted By zzyzx_xyzzy

surly makes that fork in a 1 1/8 also you know

surly makes that fork in a 1 1/8 also you know
Forum: Bicycle Mechanics
07-19-11, 12:49 PM
Replies: 14
Views: 4,266
Posted By zzyzx_xyzzy

It will ride the same as any other steel tubing...

It will ride the same as any other steel tubing that has the same butts and wall thickness. It will weigh the same as any other steel tubing with the same wall thickness and butts.

Alloy...
Forum: Advocacy & Safety
07-12-11, 11:46 AM
Replies: 69
Views: 2,929
Posted By zzyzx_xyzzy

Having grown up in NM, I'm more familiar with the...

Having grown up in NM, I'm more familiar with the opinion that it's a "dry heat" and not nearly as bad as in the muggy southeast.
Forum: Bicycle Mechanics
07-02-11, 03:03 AM
Replies: 8
Views: 546
Posted By zzyzx_xyzzy

24-39-42, with the 9 speed 11/34 makes a modern...

24-39-42, with the 9 speed 11/34 makes a modern day half step + granny setup.
Forum: Bicycle Mechanics
07-01-11, 07:38 PM
Replies: 16
Views: 3,658
Posted By zzyzx_xyzzy

Bridgestone (sensibly) used tubing with different...

Bridgestone (sensibly) used tubing with different wall thicknesses for different size frames, especially in later years, which would explain why they didn't publish seat post sizing.
Forum: Bicycle Mechanics
06-15-11, 01:50 AM
Replies: 4
Views: 932
Posted By zzyzx_xyzzy

you have the big cog 6 mm from the bike's...

you have the big cog 6 mm from the bike's centerline? That can't possibly be right. You couldn't build a wheel that would support that. Your measurements are off by ~20mm I bet
Forum: Bicycle Mechanics
06-09-11, 02:29 AM
Replies: 17
Views: 3,429
Posted By zzyzx_xyzzy

Strange. I always have lots of glue left after...

Strange. I always have lots of glue left after I'm done with all the patches. (and I don't go through patches quickly, I've done like three this year so far?)
Forum: Bicycle Mechanics
06-07-11, 05:57 PM
Replies: 33
Views: 32,051
Posted By zzyzx_xyzzy

Those opinions make no sense. The physics are the...

Those opinions make no sense. The physics are the opposite. For the same amount of deceleration, a larger rotor puts less force into the dropout/axle than a smaller rotor. In the limit of larger and...
Forum: Bicycle Mechanics
06-07-11, 11:47 AM
Replies: 4
Views: 14,073
Posted By zzyzx_xyzzy

If it's happening over and over you might have...

If it's happening over and over you might have better luck with different brake pads. Shimano pads seem to be pretty bad for turning themselves into lathe bits. Kool-Stop are better.

I would skip...
Forum: Bicycle Mechanics
06-06-11, 05:34 PM
Replies: 23
Views: 4,822
Posted By zzyzx_xyzzy

There are places on a bike frame that are lightly...

There are places on a bike frame that are lightly stressed, where a dent is not a big deal. I don't think that's one of them.
Forum: Bicycle Mechanics
06-03-11, 08:21 PM
Replies: 63
Views: 18,683
Posted By zzyzx_xyzzy

Regarding positioning the axle.... look at any...

Regarding positioning the axle.... look at any vertical dropout, the axle is in front of the derailleur hanger. Derailleurs are designed assuming the axle is a bit in front of the hanger... right up...
Forum: Bicycle Mechanics
06-02-11, 10:21 PM
Replies: 63
Views: 18,683
Posted By zzyzx_xyzzy

Everyone in this thread seems to be talking about...

Everyone in this thread seems to be talking about front facing dropouts.

The troll has rear facing dropouts. You just shove the wheel in until it stops, no?
Forum: Bicycle Mechanics
06-01-11, 06:29 AM
Replies: 14
Views: 1,022
Posted By zzyzx_xyzzy

Is it ALREADY time for another one of those...

Is it ALREADY time for another one of those blasted wheelbuilding threads where people flame each other for saying the same things in different words?
Forum: Bicycle Mechanics
05-31-11, 12:19 PM
Replies: 13
Views: 1,062
Posted By zzyzx_xyzzy

This will not work if the chainstays are...

This will not work if the chainstays are asymmetric because of a dimple for chainring clearance (like many, many bikes.) Good for the frames it works for, though...
Forum: Bicycle Mechanics
05-30-11, 10:18 PM
Replies: 15
Views: 2,367
Posted By zzyzx_xyzzy

They're just using the same crank mold they use...

They're just using the same crank mold they use for a 110/74 triple. If you got them drilled you'd just have a regular triple crank -- setting it up as a double using inner/middle positions will give...
Forum: Bicycle Mechanics
05-29-11, 01:55 PM
Replies: 4
Views: 834
Posted By zzyzx_xyzzy

I think Sheldon's objection to the front roller...

I think Sheldon's objection to the front roller brake was to its "power modulator". My experience with the Shimano rollerbrake is that its strong but *grabby,* perhaps that's what Shimano warns...
Forum: Bicycle Mechanics
05-29-11, 01:49 PM
Replies: 16
Views: 2,543
Posted By zzyzx_xyzzy

Probably your chain and/or your small sprocket is...

Probably your chain and/or your small sprocket is worn out and needs replacement.

If they were telling you that starting in top gear accelerates you too slowly, or that it could be too hard on...
Forum: Bicycle Mechanics
05-27-11, 06:54 PM
Replies: 9
Views: 712
Posted By zzyzx_xyzzy

the biggest problems are fit and handling. In...

the biggest problems are fit and handling. In order to avoid extreme toe overlap on a 700c bike most mass producers give small sizes a slack head tube angle and steep seat tube angle, and often still...
Forum: Bicycle Mechanics
05-27-11, 08:10 AM
Replies: 10
Views: 1,430
Posted By zzyzx_xyzzy

You can change the shape of the bars, but that...

You can change the shape of the bars, but that doesn't change the actual problem that's making you put all the weight on your shoulders: the seat on a time trial bike is way too far forward.
Forum: Bicycle Mechanics
05-20-11, 02:33 PM
Replies: 3
Views: 491
Posted By zzyzx_xyzzy

Can't think of a way it would hurt anything; it...

Can't think of a way it would hurt anything; it might not go in all the way if it hits a bottle boss or something. Deeply inserted posts can be a source of mysterious once-per-crank-revolution...
Forum: Bicycle Mechanics
05-17-11, 10:07 PM
Replies: 31
Views: 2,040
Posted By zzyzx_xyzzy

As long as we're quoting cycle luminaries, here's...

As long as we're quoting cycle luminaries, here's Jobst Brandt quoted on http://yarchive.net/bike/ball_bearings.html :
Forum: Bicycle Mechanics
05-17-11, 08:27 PM
Replies: 31
Views: 2,040
Posted By zzyzx_xyzzy

The ends of the axle being so much closer...

The ends of the axle being so much closer together than the rim is from the axles, there have been plenty of times I've felt "no play" in the axles, put the wheel in the frame, clamped the QR and...
Forum: Bicycle Mechanics
05-15-11, 06:30 PM
Replies: 12
Views: 1,132
Posted By zzyzx_xyzzy

Soma's Lauterwasser bar, not a traditional drop...

Soma's Lauterwasser bar, not a traditional drop bar but a similar concept and is 22.2
Forum: Bicycle Mechanics
05-14-11, 02:39 AM
Replies: 5
Views: 4,606
Posted By zzyzx_xyzzy

that would leave 0.1mm wall thickness in the seat...

that would leave 0.1mm wall thickness in the seat tube -- coke can thin. so almost certainly not.
Forum: Bicycle Mechanics
05-09-11, 10:40 PM
Replies: 15
Views: 2,497
Posted By zzyzx_xyzzy

While you're bringing up tension: find the spot...

While you're bringing up tension: find the spot that is too high/low/out of lateral true. Before you apply the wrench, pluck the 3 spokes on either side of the hop listening to the tone. Often you...
Forum: Bicycle Mechanics
04-14-11, 07:43 PM
Replies: 6
Views: 586
Posted By zzyzx_xyzzy

that's the way a crank on a square taper bottom...

that's the way a crank on a square taper bottom bracket looks. Nothing wrong. You're going to have to replace the bolt and torque it to the right tightness though....
Forum: Bicycle Mechanics
04-02-11, 03:09 PM
Replies: 20
Views: 1,743
Posted By zzyzx_xyzzy

Keyways never did that job anyway--have, among...

Keyways never did that job anyway--have, among other examples a Tange headet with a beefy keyed washer and toothed interface between key washer and cone, and it comes loose all the time. the keyed...
Forum: Bicycle Mechanics
03-28-11, 02:10 PM
Replies: 13
Views: 787
Posted By zzyzx_xyzzy

Head tube angle is not really a fit parameter,...

Head tube angle is not really a fit parameter, and you're describing a fit problem. Maybe you are feeling a difference in SEAT tube angle. Is the seat tube much slacker angled than your other bikes?...
Forum: Bicycle Mechanics
03-27-11, 09:22 AM
Replies: 13
Views: 787
Posted By zzyzx_xyzzy

Other than a shorter fork or 650b wheel in front...

Other than a shorter fork or 650b wheel in front I can't think of anything.

Note that in theory lowering the front end will also reduce pedal clearance, move the saddle forward, effectively...
Forum: Bicycle Mechanics
03-25-11, 03:55 PM
Replies: 8
Views: 841
Posted By zzyzx_xyzzy

Like clockwork, every 100 feet, make 7 crank...

Like clockwork, every 100 feet, make 7 crank revolutions - pop - 7 crank revolutions - pop? Sticky or worn chain link. See if you can time it so you stop right as it pops, maybe you'll catch it with...
Forum: Bicycle Mechanics
03-10-11, 06:27 PM
Replies: 35
Views: 2,977
Posted By zzyzx_xyzzy

Okay. Let's talk hydraulics. ...

Okay. Let's talk hydraulics.
http://books.google.com/books?id=NBMtphgTmxgC&lpg=PA264&dq=hydraulic%20hoop%20stress&pg=PA264#v=onepage&q&f=false

When you read that, you will discover that a larger...
Forum: Bicycle Mechanics
03-10-11, 11:46 AM
Replies: 12
Views: 3,615
Posted By zzyzx_xyzzy

Is the cable hanger butting up against the...

Is the cable hanger butting up against the headset?
Forum: Bicycle Mechanics
03-10-11, 03:11 AM
Replies: 8
Views: 3,249
Posted By zzyzx_xyzzy

I'm assuming you have a threadless fork and...

I'm assuming you have a threadless fork and headset, else the question doesn't make a lot of sense. What hasn't been mentioned, is that on a threadless headset, it's pretty essential that the bottom...
Forum: Bicycle Mechanics
03-09-11, 09:45 PM
Replies: 35
Views: 2,977
Posted By zzyzx_xyzzy

You've had a Dyad and you've heard recommented...

You've had a Dyad and you've heard recommented Mavic A719, A319. These are all hefty rim-brake-compatible rims, but since you don't have rim brakes on this bike, you might prefer a disc specific rim...
Forum: Bicycle Mechanics
03-04-11, 06:21 AM
Replies: 20
Views: 4,293
Posted By zzyzx_xyzzy

Trek's women specific designs don't look like...

Trek's women specific designs don't look like they differ from men's geometry at all; they just offer one smaller size. This is actually typical of most manufacturers (the myth that women have longer...
Forum: Bicycle Mechanics
02-22-11, 02:13 PM
Replies: 18
Views: 1,168
Posted By zzyzx_xyzzy

I do a lot of dirt roads and trails on my touring...

I do a lot of dirt roads and trails on my touring bike, I ride a huuuuuuuge frame with minimal standover, have had to unclip and foot-dab many times.... and I have yet to hurt myself in that...
Forum: Bicycle Mechanics
02-08-11, 12:58 PM
Replies: 5
Views: 962
Posted By zzyzx_xyzzy

Locknut's bearing down on top of the steer tube....

Locknut's bearing down on top of the steer tube. If so a bigger spacer would help. Better to have one big spacer than a bunch of small ones, BTW.
Forum: Bicycle Mechanics
02-07-11, 06:44 PM
Replies: 42
Views: 3,698
Posted By zzyzx_xyzzy

What you see in that video is that it is much...

What you see in that video is that it is much faster to go pluck, pluck, pluck, to find the spoke that needs to be adjusted to bring (lateral + radial + even tension) closer to balance, th
Forum: Bicycle Mechanics
02-05-11, 08:38 AM
Replies: 42
Views: 3,698
Posted By zzyzx_xyzzy

I have the impression that Jobst's scheme applied...

I have the impression that Jobst's scheme applied to rims that were quite a bit flexier than what people use today.
Forum: Bicycle Mechanics
02-04-11, 10:24 AM
Replies: 11
Views: 1,663
Posted By zzyzx_xyzzy

If you laced the drive side all trailing you'd...

If you laced the drive side all trailing you'd have to lace the NDS all leading; that would put a massive twist force on the hub shell. There are other weird things it would do also, like the whole...
Forum: Bicycle Mechanics
02-04-11, 10:01 AM
Replies: 9
Views: 5,700
Posted By zzyzx_xyzzy

What's your technique for drilling the holes on...

What's your technique for drilling the holes on center?
Forum: Bicycle Mechanics
02-04-11, 03:02 AM
Replies: 10
Views: 6,047
Posted By zzyzx_xyzzy

Go SLOWER and maintain true while you add...

Go SLOWER and maintain true while you add tension. Tension needs to be built up gradually around the whole wheel.

1. find a high spot or an out-of-true spot,
2. find a spoke nearby that is lower...
Forum: Bicycle Mechanics
01-26-11, 04:19 PM
Replies: 23
Views: 1,223
Posted By zzyzx_xyzzy

Such sound and fury, signifying nothing. ...

Such sound and fury, signifying nothing.

Even a pristine drivetrain in perfect alignment can do this if it's cross chained, especially using an 9 or 10 speed drivetrain. Take any new bike from...
Forum: Bicycle Mechanics
01-26-11, 04:44 AM
Replies: 23
Views: 1,223
Posted By zzyzx_xyzzy

derailleur drivetrain's meant to go forwards,...

derailleur drivetrain's meant to go forwards, when pushed backwards the chain goes slack and easily comes off the cogs and rings, especially if you are in an extreme gear. just the way it is.
Forum: Bicycle Mechanics
01-24-11, 02:14 AM
Replies: 11
Views: 1,449
Posted By zzyzx_xyzzy

Uh, yes someone does make a part for that. It's a...

Uh, yes someone does make a part for that. It's a headtube extension rather than a crown race extension though.

http://www.eighthinch.com/headtube_extenders.html

Not recommended for off road...
Forum: Bicycle Mechanics
01-16-11, 06:30 AM
Replies: 11
Views: 1,693
Posted By zzyzx_xyzzy

Even with ordinary tension, if your rim has steel...

Even with ordinary tension, if your rim has steel sockets or eyelets they can get a little corrosion and make creaky sounds. Try a drop of oil at each nipple/eyelet interface and see if that quiets...
Forum: Bicycle Mechanics
01-10-11, 12:57 PM
Replies: 4
Views: 1,265
Posted By zzyzx_xyzzy

Longer chainring nut? It should be long enough to...

Longer chainring nut? It should be long enough to partially stick into the chainring guard from the backside.
Forum: Bicycle Mechanics
01-09-11, 07:54 PM
Replies: 9
Views: 18,411
Posted By zzyzx_xyzzy

Often manufacturers just measure their frame...

Often manufacturers just measure their frame sizes from different points. Could be that EAI measures 52cm from the center of BB to the center of the top tube, while Soma measures 55cm from the center...
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