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17 votes

What freewheel mechanism designs are used in bicycles?

Standard Pawl and Ratchet Design This design is by far the most common on bicycle freehubs, and as such the least expensive to employ. Mechanism In it's simplest form, this design consists of a ...
Paul's user avatar
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17 votes
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How to adapt a spoke salvaged from a 26" wheel to a 24" one?

Answer: Buy new spokes. A spoke is threaded not with a die, but with rollers. The difference is that a die cuts away metal leaving a thread with an OD no-larger than the original. A roller will cold-...
Criggie's user avatar
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15 votes

Reverse Gear in Bicycles

Such a hub exists for trike and quads . Pedal forward with 3 or 5 gears then having a coaster brake to stop . At full stop with the brake engaged continued backward pedal pressure will cause the cycle ...
Hamish Arley's user avatar
14 votes
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Why are trigger shifters so widely used, instead of the twisting grip shifters(revoshift)?

In the context of a high-end MTB designed to go quickly over difficult terrain, trigger shifters have the following advantages: They can be operated using only the thumb, without changing the grip, ...
Roman Odaisky's user avatar
13 votes
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How can I lower the gear ratio on my son's bike?

The specific model of rear derailleur you have is an Acera RD-M360 SGS, produced about 2009-2011, for 7 or 8 speed drivetrains. Shimano very helpfully provides archive specifications on the product ...
Argenti Apparatus's user avatar
12 votes

What freewheel mechanism designs are used in bicycles?

American Classic Cam Plate Design The full name is "Six Pawl Cam Actuated Engagement System." This design is one of the more complicated ones, but according to American Classic provides a ...
Paul's user avatar
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11 votes

What freewheel mechanism designs are used in bicycles?

Star Ratchet and variations This design in it's simplest form is used by DT Swiss. This design incorporates easily replaceable ratchet plates that offer the added benefit of every engagement point ...
Paul's user avatar
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11 votes
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Rusty chain and back cassette – Replace or repair?

As long as the crank arms, chain and freewheel turn freely and all as one. Without clunk's, slipping or sticking at any point there should be no need to replace any of it. The surface rust will not ...
David's user avatar
  • 290
11 votes

Switching a 11 speed cassette+wheel with a 8 speed freewheel+wheel. Any compatibility issues?

No sorry, this is not practical. Freewheels mostly stopped at 7 speed, and 8 speed was rare because of excess unsupported axle causing bent axles due to leverage. Your suggested plan would require ...
Criggie's user avatar
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11 votes
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How does one remove a old French (Maillard) sprocket set from its freewheel?

You are correct, the smallest sprocket is threaded to the freewheel on the old Maillard freewheels. Using two chain whips, one on the smallest sprocket, one on the next one up or a few farther. ...
David D's user avatar
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11 votes

What if both wheels were powered by pedalling?

Many two wheel drive mountain bikes exist. Here's one article advertising a new one: There’s been no shortage of attempts to build a workable two wheel drive bicycle over the years, but this latest ...
Móż's user avatar
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10 votes

Reverse Gear in Bicycles

While it may be possible, by creating a mechanism that shifts the chain from one freewheel to another, or disconnecting one temporarily through mechanical actuators, the hassle and engineering it ...
Nate W's user avatar
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10 votes

Terminology: coaster brakes vs free wheel?

It doesn't make much sense to insist on one thing being the opposite of another, so let's just focus on what these things are, and you can decide for yourself what, if anything, is "opposite" of what. ...
David Richerby's user avatar
10 votes
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Is there any reason why my 21-speed bike has 118 chain links?

There is no standard for chainstay length. Bikes of a given type tend to cluster around certain very common chainstay length choices, but there can be outliers in eitehr direction. Thus there is ...
Nathan Knutson's user avatar
9 votes

What freewheel mechanism designs are used in bicycles?

Sprag Clutch The sprag clutch has existed in industrial applications for some time: being used in motorcycles, helicopters, airplanes, automotive transmissions, and others. As far as I know, Onyx is ...
Paul's user avatar
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9 votes

How can I lower the gear ratio on my son's bike?

While not suggesting its the best option, another option from a new cassette is a 30 tooth chainring. which will give close to same ratios as a 14-34 cassette. Square taper cranks can often be picked ...
mattnz's user avatar
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9 votes

Catastrophic hub failure, can the freewheel and rim be saved?

The practical choices are replace the axle or replace the wheel. Replacing the hub would mean rebuilding the rim on a new hub, which is not cost-effective for this kind of wheel, especially since ...
Nathan Knutson's user avatar
8 votes

Removing an unusual freewheel

The Park Tool FR-3 should fit that. https://www.parktool.com/product/freewheel-remover-fr-3
Noah Sutherland's user avatar
8 votes

Just replaced axle on rear wheel. It is loose at first but as soon as I ride it, it tightens and wheel no longer rotates. Help!

I have sometimes made the mistake of not tightening the locknuts enough, causing the rotation of bearings to drag the cone, tightening it enough for the bearing to bind. The solution is to properly ...
Jahaziel's user avatar
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8 votes

0W-20 engine oil for freewheel pawls?

Engine oils are generally a bad idea on a bike. They tend to be quite liquid and will dribble out over time. Engine oils are also known to grab and hold dirt, because that's one of their purposes in ...
Criggie's user avatar
  • 125k
8 votes

What to do with a busted freewheel on a vintage road bike?

Given the freewheel is toast already, there's no harm in disassembling it to attempt a refurb. If it breaks, it was already failed and you're no worse off. Start by removing the freewheel and ...
Criggie's user avatar
  • 125k
8 votes

How to adapt a spoke salvaged from a 26" wheel to a 24" one?

Buy a new one, they cost cents, so the only issue is does it take longer to drive to a bike shop than rehash an old spoke. Used spokes are prone to failure, anyway, heating the spoke enough to create ...
mattnz's user avatar
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8 votes
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How am I supposed to get into this screw-on singlespeed freewheel?

The outer race (which takes the pin spanner) is reverse threaded. It's impressive that you were able to get it off the wheel with only a pin spanner, but by doing so you have likely made it very tight....
Nathan Knutson's user avatar
8 votes
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I need help fixing my axle

Axles of this type are standardized and replaceable, but the problem in a situation like this (axle is discovered to be broken upon wheel removal) is that by the time of discovery, it's very likely ...
Nathan Knutson's user avatar
7 votes
Accepted

Is this an unsuitable cassette lockring tool?

I think thats a Shimano freewheel, rather than a cassette. A Shimano freewheel needs a tool like a Park Tool FR-1 (or FR-1.2 or FR-1.3), which has 12 splines and a diameter of around 23 mm rather ...
Batman's user avatar
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7 votes
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How to remove this Shimano cassette (actually: freewheel)?

Thats a Shimano freewheel, not a cassette. You need a freewheel remover like Park Tool FR-1 to remove it. Note that this is not the same tool as the cassette tool (e.g. Park Tool FR-5 for Shimano-type ...
Batman's user avatar
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7 votes

Could I replace a hub on a wheel?

Simple answer: yes, but it’s not worth doing. Cost of hub, spokes, nipples and having wheel rebuilt will exceed the cost of a new wheel. Even if you re-use the spokes a new wheel will still be ...
Argenti Apparatus's user avatar
7 votes

Could I replace a hub on a wheel?

Yes - I have personally done this, by installing an 8 speed cassette freehub into a wheel that had a 6 speed freewheel. The donor was a 26" MTB wheel, and the recipient was a 20" wheel for my folding ...
Criggie's user avatar
  • 125k
7 votes

How can I lower the gear ratio on my son's bike?

Shimano makes the TZ510 7-speed freewheel which is 14-34 teeth. It generally retails for under $20. You'll need to get a "freewheel removal tool" which is a splined tool on one side while ...
Jeff's user avatar
  • 10.5k
7 votes
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Are freewheels really that prone and susceptible to bent axles?

It almost certainly won't happen with a cassette hub. It can happen on standard axle cassette hubs, but it takes a lot, and there's basically always a dropout alignment problem at work in addition to ...
Nathan Knutson's user avatar

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