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Search: Posts Made By: Sheldon Brown
Showing results 1 to 50 of 1000
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Forum: Bicycle Mechanics
02-03-08, 08:31 PM
Replies: 20
Views: 12,656
Posted By Sheldon Brown

Yes, freewheel threading is quite well...

Yes, freewheel threading is quite well standardized. There used to be an oddball French size, but that went extinct sometime in the '80s.

Your hub will work fine with any freewheel, though I...
Forum: Bicycle Mechanics
02-03-08, 12:23 PM
Replies: 14
Views: 993
Posted By Sheldon Brown

I'm a bass-baritone, been doing it since I was...

I'm a bass-baritone, been doing it since I was about 45...

Sheldon "I Have A Song To Sing, O" Brown
Forum: Bicycle Mechanics
02-02-08, 09:24 PM
Replies: 4
Views: 1,506
Posted By Sheldon Brown

Spokes are generally 56 tpi, so one turn of the...

Spokes are generally 56 tpi, so one turn of the nipple will shorten the spoke by 1/56"

How much that will move the rim sideways depends on the angle of the spoke from the central plane of the...
Forum: Bicycle Mechanics
02-02-08, 05:12 PM
Replies: 2
Views: 599
Posted By Sheldon Brown

Nope. This is doable with Campagnolo Ergo stuff,...

Nope. This is doable with Campagnolo Ergo stuff, but not with Shimano STI.

Note that the Shimano 10-speed STI brifters are MUCH improved over the 9-speed ones, the number of speeds is not the...
Forum: Bicycle Mechanics
02-02-08, 04:50 PM
Replies: 18
Views: 11,387
Posted By Sheldon Brown

The selection of chainring sizes for 4-bolt...

The selection of chainring sizes for 4-bolt cranks is MUCH more limited than it is for the three most common 5-bolt patterns: 74 mm, 110 mm, 130 mm.



http://sheldonbrown.com/tooltips/taps.html...
Forum: Bicycle Mechanics
02-02-08, 12:46 PM
Replies: 5
Views: 5,575
Posted By Sheldon Brown

If your Weinmann levers are for drop handlebars,...

If your Weinmann levers are for drop handlebars, any "pear shaped" a.k.a. "road" cables will work.

If your bike has upright handlebars, the Weinmann levers want cylindrical "mountain" cables.
...
Forum: Bicycle Mechanics
02-01-08, 09:27 PM
Replies: 16
Views: 885
Posted By Sheldon Brown

Nothing to do with chain length. My bet is...

Nothing to do with chain length.

My bet is that the lockring is the culprit. Shimano makes special lockrings to go with 11 tooth sprockets, the outer flange has a slightly smaller diameter.

If...
Forum: Bicycle Mechanics
02-01-08, 04:47 PM
Replies: 14
Views: 993
Posted By Sheldon Brown

Couldn't be Acera, but if it used the same size...

Couldn't be Acera, but if it used the same size rings, you didn't need to change cranks...coulda just changed chainrings.

You should measure the chainline. This is explained at...
Forum: Bicycle Mechanics
01-31-08, 10:02 PM
Replies: 3
Views: 691
Posted By Sheldon Brown

This should work, but I don't see the point of...

This should work, but I don't see the point of having two separate wheels for this.

Slicks are best for the trainer.

Slicks are best for the road.

If you were doing major off-roading on...
Forum: Bicycle Mechanics
01-31-08, 01:32 PM
Replies: 74
Views: 6,300
Posted By Sheldon Brown

Skiddability (is that a word?) is mainly...

Skiddability (is that a word?) is mainly determined by weight distribution. Most normal bikes have about a 55/45 rear/front weight distribution.

For skidding contests, where the idea is to...
Forum: Bicycle Mechanics
01-30-08, 11:31 PM
Replies: 5
Views: 628
Posted By Sheldon Brown

Nope, it's the outside diameter of the steerer...

Nope, it's the outside diameter of the steerer tube, a part that is not visible on an assembled bike.

The hole is 1/8" smaller than the nominal size.

See my article on Headset types:...
Forum: Bicycle Mechanics
01-30-08, 06:14 PM
Replies: 74
Views: 6,300
Posted By Sheldon Brown

I don't believe that track geometry makes skids...

I don't believe that track geometry makes skids any easier, but then I also believe that skidding is a Bad Thing generally.

Track geometry is designed for the perfectly smooth surface of a...
Forum: Bicycle Mechanics
01-30-08, 05:27 PM
Replies: 74
Views: 6,300
Posted By Sheldon Brown

Not sure if you're being serious or not. I...

Not sure if you're being serious or not.

I consider a nice "tenspeed" conversion to be generally superior to the typical $600 or less of-the-shelf fixie, if it's to be used on the street.
...
Forum: Bicycle Mechanics
01-30-08, 01:01 PM
Replies: 74
Views: 6,300
Posted By Sheldon Brown

I cringe to think of a nice old bike like that...

I cringe to think of a nice old bike like that having spent 20 years hanging on a wall somwhere when somebody could have loved and ridden it!

I love fixed gear and always encourage people to try...
Forum: Bicycle Mechanics
01-30-08, 11:48 AM
Replies: 9
Views: 1,187
Posted By Sheldon Brown

Right. All Shimano systems shift equally...

Right.

All Shimano systems shift equally well, generally. When you go for the "higher level" components you're mainly gaining lightness and, in some cases, long-term durability. The more...
Forum: Bicycle Mechanics
01-30-08, 11:45 AM
Replies: 3
Views: 471
Posted By Sheldon Brown

The only Shimano hubs that are "10-speed only"...

The only Shimano hubs that are "10-speed only" are Dura-Ace 7800 and the hubs in the Ultegra complete wheels, I think the number is 6600.

Unfortunately, these hubs use a completely different...
Forum: Singlespeed & Fixed Gear
01-29-08, 10:41 PM
Replies: 45
Views: 2,139
Posted By Sheldon Brown

http://sheldonbrown.com/images/measure-chainline-a...

http://sheldonbrown.com/images/measure-chainline-angled.jpg


Sheldon "Pixels" Brown
Forum: Bicycle Mechanics
01-29-08, 10:20 PM
Replies: 10
Views: 5,320
Posted By Sheldon Brown

Trying to get a less-agressive position by moving...

Trying to get a less-agressive position by moving the saddle far forward seems like it should work but it usually is a change for the worse.

Your upper body is supported by your legs and by your...
Forum: Bicycle Mechanics
01-28-08, 04:53 PM
Replies: 2
Views: 4,834
Posted By Sheldon Brown

S-6 is not a size, it's a rim cross-sectional...

S-6 is not a size, it's a rim cross-sectional shape used by Schwinn in many different wheel sizes.

K2 rings a bell, I believe that's an obscure British designation for the ISO 630 mm rim size,...
Forum: Bicycle Mechanics
01-28-08, 04:45 PM
Replies: 3
Views: 2,119
Posted By Sheldon Brown

Derailers generally don't care about how many...

Derailers generally don't care about how many speeds.

See: http://sheldonbrown.com/speeds for details on this.

Sheldon "No Problem" Brown
Forum: Classic & Vintage
01-27-08, 04:06 PM
Replies: 16
Views: 1,144
Posted By Sheldon Brown

There are lots of theories about this, but the...

There are lots of theories about this, but the one that I find most plausible has to do with swords.

A right-handed swordsman wears his sword on the left. If he tried to mount a horse (or a...
Forum: Bicycle Mechanics
01-27-08, 03:58 PM
Replies: 1
Views: 443
Posted By Sheldon Brown

See: http://sheldonbrown.com/autoshift ...

See: http://sheldonbrown.com/autoshift

Sheldon "Grease" Brown
Forum: Bicycle Mechanics
01-25-08, 04:50 PM
Replies: 8
Views: 7,474
Posted By Sheldon Brown

Yes, Atom/Maillard was the same company at the...

Yes, Atom/Maillard was the same company at the time they were doing the infamous Helicomatic. (http://sheldonbrown.com/gloss_ha-i.html#helicomatic)

Sheldon "Caveat Emptor" Brown
Forum: Singlespeed & Fixed Gear
01-25-08, 01:13 PM
Replies: 62
Views: 8,110
Posted By Sheldon Brown

No, it's only OK if you have TWO brakes. I...

No, it's only OK if you have TWO brakes.

I DO recommend LocTite for this application.

See: http://sheldonbrown.com/fixed-conversion.html#freewheelhub

Sheldon "Redundancy" Brown...
Forum: Bicycle Mechanics
01-24-08, 07:56 PM
Replies: 4
Views: 595
Posted By Sheldon Brown

Keeeeerect! Rear derailers don't care how...

Keeeeerect!

Rear derailers don't care how many speeds, that's just marketing.

Sheldon " http://sheldonbrown.com/speeds " Brown
Forum: Bicycle Mechanics
01-24-08, 02:37 PM
Replies: 10
Views: 860
Posted By Sheldon Brown

It is NOT a "coaster" brake, it's a hand-operated...

It is NOT a "coaster" brake, it's a hand-operated drum brake.

Splined BMX sprockets will fit fine, they aren't Hyperglide.

See: http://sheldonbrown.com/harris/singlespeed.html#sprockets

If...
Forum: Bicycle Mechanics
01-24-08, 01:26 PM
Replies: 13
Views: 2,817
Posted By Sheldon Brown

That's correct, just lay the bike on its left...

That's correct, just lay the bike on its left side and drip the oil in where the pushrod goes.

See also: http://sheldonbrown.com/333

Sheldon "Oil" Brown
Forum: Bicycle Mechanics
01-24-08, 01:24 PM
Replies: 10
Views: 860
Posted By Sheldon Brown

Those are drum brakes, not coaster brakes. ...

Those are drum brakes, not coaster brakes.

They appear to require Shimano Uniglide cassettes, which were discontinued in the late '80s.

See: http://sheldonbrown.com/k7.html#uniglide

Sheldon...
Forum: Bicycle Mechanics
01-23-08, 08:55 PM
Replies: 3
Views: 1,984
Posted By Sheldon Brown

We used to sell drop bolts for dual pivot...

We used to sell drop bolts for dual pivot calipers like yours. I created an instructional page at:

http://www.sheldonbrown.com/dpdropbolt.html

The drop bolts are extinct, but I left the page...
Forum: Bicycle Mechanics
01-23-08, 01:50 PM
Replies: 6
Views: 719
Posted By Sheldon Brown

It's listed as 12-28. This is a VERY common...

It's listed as 12-28. This is a VERY common cassette, but I have never heard of a freewheel in those sizes.

Old Regina and a very few Sun Tour freewheels were available with 12 tooth sprockets,...
Forum: Bicycle Mechanics
01-23-08, 01:33 PM
Replies: 6
Views: 590
Posted By Sheldon Brown

You might want to consider mounting your light...

You might want to consider mounting your light somewhere else. Generally, mounting it lower will help identify broken pavement, stones and other road hazards more easily. The farther below...
Forum: Bicycle Mechanics
01-23-08, 12:07 PM
Replies: 6
Views: 719
Posted By Sheldon Brown

Sorry you didn't find the right page. The page...

Sorry you didn't find the right page. The page that is devoted to answering this question is http://sheldonbrown.com/free-k7

That's a cassette Freehub, but an off-brand, not genuine Shimano. ...
Forum: Bicycle Mechanics
01-22-08, 11:07 PM
Replies: 7
Views: 638
Posted By Sheldon Brown

RSX derailers are perfectly ordinary. The...

RSX derailers are perfectly ordinary.

The adjustment procedure is the same as for any derailers made in the last 25 years.

See: http://sheldonbrown.com/derailer-adjustment

Sheldon "Nothing...
Forum: Bicycle Mechanics
01-22-08, 06:36 PM
Replies: 5
Views: 581
Posted By Sheldon Brown

18 Sheldon "22 Is Bottom Brackets"...

18

Sheldon "22 Is Bottom Brackets" Brown
Forum: Bicycle Mechanics
01-22-08, 06:33 PM
Replies: 3
Views: 568
Posted By Sheldon Brown

No need, you did it just right. This is...

No need, you did it just right.

This is common. Ideally, the rack should mount closest to the frame, and the fender stays outboard of the rack, but that isn't always possible.

Sheldon "Hope...
Forum: Bicycle Mechanics
01-22-08, 06:07 PM
Replies: 4
Views: 466
Posted By Sheldon Brown

Yes. Add the spacers to the left side, then...

Yes. Add the spacers to the left side, then re-dish the wheel (this will make the wheel stronger.)

Sheldon "http://sheldonbrown.com/frame-spacing" Brown
Forum: Bicycle Mechanics
01-21-08, 04:30 PM
Replies: 5
Views: 2,071
Posted By Sheldon Brown

Yes, I have made a specific Web page for exactly...

Yes, I have made a specific Web page for exactly this question: http://sheldonbrown.com/free-k7 (http://sheldonbrown.com/free-k7)

Sheldon "FAQ" Brown
Forum: Bicycle Mechanics
01-21-08, 01:56 PM
Replies: 23
Views: 8,328
Posted By Sheldon Brown

The advantage of the "Parallel Push" is the...

The advantage of the "Parallel Push" is the _direction_ the pads move in.

Simple cantilevers, either cable style, move in a circular arc centered on the frame/fork boss.

For bikes with skinny...
Forum: Bicycle Mechanics
01-21-08, 01:31 PM
Replies: 16
Views: 7,506
Posted By Sheldon Brown

Japanese stuff commonly used 14 mm before the...

Japanese stuff commonly used 14 mm before the switch to 8 mm Allen bolts. Could be 15 mm though. Generally 1/2" drive 15 mm sockets won't fit into the hole, nor will cheapo 3/8" drive sockets.
...
Forum: Bicycle Mechanics
01-21-08, 12:52 PM
Replies: 4
Views: 13,928
Posted By Sheldon Brown

See my article "Hands Up"...

See my article "Hands Up" http://sheldonbrown.com/handsup (http://sheldonbrown.com/handsup)

Sheldon "Reach For The Sky" Brown
Forum: Bicycle Mechanics
01-21-08, 12:50 PM
Replies: 23
Views: 8,328
Posted By Sheldon Brown

Leverage, a.k.a. "mechanical advantage" has...

Leverage, a.k.a. "mechanical advantage" has nothing to do with the type of mechanism, any type of brake can be designed to provide any desired leverage. Usable leverage is determined by how much...
Forum: Bicycle Mechanics
01-21-08, 12:40 PM
Replies: 6
Views: 636
Posted By Sheldon Brown

You don't need to remove it to flush it. My...

You don't need to remove it to flush it. My advice is to leave it on the hub, unless/untill you decide to replace it for some reason.

Put the wrench in a vise, that way you can apply balanced...
Forum: Bicycle Mechanics
01-20-08, 07:03 PM
Replies: 24
Views: 13,421
Posted By Sheldon Brown

Nothing can be generalized based on a single...

Nothing can be generalized based on a single flat, especially since you failed to mention what _caused_ the flat.

I will say that it's silly for a person as heavy as you or I to be riding such...
Forum: Bicycle Mechanics
01-20-08, 06:12 PM
Replies: 25
Views: 17,482
Posted By Sheldon Brown

Right. The problem is the availability of...

Right.

The problem is the availability of the "appropriate tool" for a freewheel design that was discontinued 25 or 30 years ago.

That's not true in this case, because it is a splined tool,...
Forum: Bicycle Mechanics
01-20-08, 06:02 PM
Replies: 9
Views: 755
Posted By Sheldon Brown

If the race is square and doesn't wiggle, it's...

If the race is square and doesn't wiggle, it's fine.

Sheldon "Perfect Is The Enemy Of Good Enough" Brown
Forum: Bicycle Mechanics
01-19-08, 11:50 PM
Replies: 25
Views: 17,482
Posted By Sheldon Brown

My mother...

My mother (http://sheldonbrown.org/joyce/index.html) taught me that you don't tip proprietors, only employees.

Maybe she was wrong, I dunno.

Sheldon "Old School" Brown
Forum: Bicycle Mechanics
01-19-08, 11:42 PM
Replies: 2
Views: 773
Posted By Sheldon Brown

For each tooth added/subtracted to a sprocket,...

For each tooth added/subtracted to a sprocket, the axle must move 1/8" (3 mm.)

For each complete link (1 inner + 1 outer) the axle moves 1/2" (13 mm).

However, different makes/models of chain...
Forum: Forum Suggestions & User Assistance
01-19-08, 03:34 PM
Replies: 334
Views: 15,010
Posted By Sheldon Brown

Search preferences not saved

I too am having problems with the search function, it's been maybe 4-5 days. It no longer saves my search preferences.

I like to do a regular search for my name, for "Items posted within the...
Forum: Bicycle Mechanics
01-19-08, 03:27 PM
Replies: 29
Views: 12,334
Posted By Sheldon Brown

This should be doable. As long as you don't run...

This should be doable. As long as you don't run the reamer too far into the steerer, to the butted section at the bottom, it should be just fine, but prepare to do a lot of sweating to remove that...
Forum: Bicycle Mechanics
01-19-08, 01:14 PM
Replies: 29
Views: 12,334
Posted By Sheldon Brown

My point was that a frame that uses a 27 mm...

My point was that a frame that uses a 27 mm seatpost is not built with "thin wall tubing." ;-)

Sheldon "Numbers" Brown
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