What Is A Free Wheel Hub?
What is a free wheel hub? A freehub is a type of bicycle hub that incorporates a ratcheting mechanism. A freewheel mechanism allows a rider to stop pedalling whilst the cycle is still in forward motion. On a cycle without a freewheel mechanism, the rider has to keep pedalling whenever the cycle is moving.
What is the difference between a free hub and a free wheel?
The difference between a freewheel system and a freehub system is in the location of the coasting mechanism. On a freewheel system, the coasting mechanism is built into the gear cluster. The freewheel is screwed onto a set of threads on the right-hand side of the wheel's hub.
How does a free wheel hub work?
The freehub is the ratcheting mechanism attached to the rear hub of most modern derailleur bike hubs. The freehub uses a splined cylinder to hold the cassette cogs. Inside the freehub mechanism will be bearings and a clutch system, usually ratcheting teeth and pawls. The cassette cogs have no moving parts.
How do you fix a free wheel hub?
How do I know if I have a free hub?
Related faq for What Is A Free Wheel Hub?
Are freewheels still used?
A freewheel clutch is now used in many motorcycles with an electric starter motor. It is used as a replacement for the Bendix drive used on most auto starters because it reduces the electrical needs of the starting system.
Do all cassettes fit all hubs?
Simply put - 8, 9, 10 speed cassettes all fit on the same hub. A seven speed cassette will fit on an 8 speed freehub with the use of a spacer. (One notable exception is the Dura Ace FH-7801 hub with an alloy freehub which will only accept 10 speed Shimano cassettes - the newer Dura Ace hubs can run 8/9/10).
How do I know if my free hub needs replacing?
Check the freehub for wear to see if it needs replacing or just cleaning and relubing. To do this, firmly grab the splined body and give it a wiggle. If it moves more than a couple of millimetres side to side, replace it.
How long do Freehubs last?
I had them last anywhere between two weeks and three months (170 miles per week). Eventually I gave up and bought a Shimano R500 rear wheel for £50 and six months later the freehub is still fine. If you're degreasing the cassette mounted to the bike, you're probably washing the grease out of the free hub.
Why do some freewheels click?
What's that clicking sound? That clicking sound is the pawls as they run across each ratchet tooth, sort of like a tiny Wheel of Fortune wheel. The pawls thread onto the hub body and spin whenever the bike is moving. The ratchet fits over the pawls.
Which is better pawls or ratchet?
The number of pawls can also vary between designs, but in general the more the better. The 'ratchet' part of the ratchet and pawl system. Big teeth and pawls will deal better with larger amounts of torque, but on the other hand a finer set up will give you faster engagement.
Why isn't my bike moving when I pedal?
Are all Shimano Freehubs the same?
Most Shimano Freehub bodies are interchangeable. The exceptions are: FH-7850 and FH-7900 Dura-Ace bodies, which have returned to a splined attachment between Freehub body and hub shell, but it is larger than the usual one. It is similar but not interchangeable between these two models.
How do you stop ghost pedaling?
The end result will be sporadic ghost pedaling when the bicycle is coasting. To fix this issue, you will have to replace the broken pawls, the freehub body, or the entire hub.
Can you use any freehub?
freehub standard accepts only XD cassettes. There are 10, 11 and 12 speed cassette versions (same XD freehub body). Many wheel and hub manufacturers make XD compatible freehub bodies that can be screwed onto the hub instead of the old Shimano compatible freehub.
Are Freehubs universal?
Of the freehub bodies out there, there are a number of different types, different types have different benefits but mainly are simply a matter of compatibility with the appropriate groupset you run on your bicycle.
Why do expensive bikes click?
A spring-loaded part that engages a set of teeth when moving in one direction, but slides over them when moving in the other direction. The pawls in a freewheel make a ticking sound when a bicycle coasts. Most freewheels have two or three pawls.
Why are Freehubs loud?
Loudness in the freehub/freebody is usually due to the very light oil used to lubricate the inner parts. Thicker oil can be used to lessen the noise and even grease in some cases, but it's high viscosity is pointed at for not being so efficient.
Are Hunt wheels noisy?
“While Hunt wheels are perceived to be a bit loud when coasting, we are certainly not the loudest and we also offer “quiet” freehub options for some road wheelsets. This is achieved by slightly rounding the tip of the pawls that would normally drag across the engagement teeth in the hub shell.”
Can you put a 7 speed cassette on a 11 speed hub?
Condensed answer: A 7-speed cassette can be installed on an 11-speed hub. Since 7-speed cassettes are narrower than 11-speed cassettes, the installation will require the use of a spacer to make up for the gap left on the hub.
Can I put an 11 speed cassette on a 9 speed hub?
An 11-speed cassette will fit on a 9-speed hub only when the hub is wide enough. Luckily, 8,9,10 and 11-speed mountain bike hubs have the same spacing, and one can therefore use an 11-speed cassette on all of them.
How often should you service a freehub?
Anyway, as a general rule, I would recommend servicing every 1500 - 2000 miles in ordinary conditions, which would be adequate with the Mavic design. If you get in there and find it clean and adequately lubed, just close it up and go longer.
Why are some bike hubs loud?
The noise produced by a rear hub, cheap or luxurious model, comes from the so-called pawls – tiny, spring-loaded elements designed to bite to the ratchet of the hub when pedaling forward. When coasting or pedaling backward, the pawls disengage and slide over the engagement surface.
Can I use a 9 speed derailleur on a 7 speed cassette?
Can I use a 9-speed derailleur on a 7-speed cassette? The answer is yes because the rear shift ratio of 9-speed and 7-speed derailleurs is the same if you stay within the same brand.
Can you convert freewheel to cassette?
You cannot convert a freewheel hub to cassette. You need a new rear hub. What he said. You'll have to either get a whole new rear wheel or buy a rear hub and spokes and have them re-laced to your current rim.
Do bike hubs make a difference?
Hubs make a huge difference when it comes to the performance of the bicycle. The hubs create the connection between the wheels and the frame of the bike, meaning that faster hubs make for a faster bike. If the bike's hubs contain excess debris within the races that hold the ball-bearings, the bike will ride slowly.
How long do Shimano hubs last?
Yup. Once a year for some folks is 1500 miles, and for others it is 10,000 miles. Local conditions have a big influence, and front hubs stay a LOT cleaner than rear hubs.