Questions tagged [freehub]

The part of the rear hub which holds the casette. It employs a ratchet and turns only when you pedal. Track bicycles / fixies don't have one.

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16
votes
4answers
15k views

What freewheel mechanism designs are used in bicycles?

What are the various freehub mechanism designs that have been designed and or put into production? (doesn't need to have been made necessarily!) A good post will contain: A description of the design,...
15
votes
7answers
2k views

Is there a roadside workaround for a freehub that won't engage reliably?

I had a lucky escape from a long walk on Saturday: 50km from home or 20km via a train, my freehub suddenly wouldn't engage - the pedals span as freely forwards as backwards. I tried dropping the back ...
15
votes
3answers
4k views

Why do freehub and cassette have only one position that matches?

When I'm installing cassette on my freehub, I need to make sure that the spaces align correctly. That is, there are 9 splines on the freehub and 9 corresponding splines on the cassette. My first ...
9
votes
8answers
10k views

Freehub pawl system vs star ratchet system

If you were to choose between a Hope Pro 4 hub and a DT Swiss 350 or 240, purely based on their freehub types, ie Hope's pawl system or DT's ratchet system, which would you choose and why? The main ...
9
votes
4answers
827 views

Servicing a Vuelta XRP Disc Hub

I can't for the life of me figure out how to get the freehub body off of this hub. Everything I can find online about the Vuelta hubs says that I should be able to stick a 5mm hex key into both sides ...
8
votes
2answers
8k views

Why am I getting no power when I pedal?

Yesterday when I was biking my mountain bike on level paved path, I would pedal but get no power to the wheel. To use a car analogy, it was as if I had the clutch in and was apply gas. It seemed to ...
7
votes
2answers
9k views

What's the difference between Shimano HG and SRAM XD free hubs?

I know that the Shimano free hub is pretty common. I think it's called HyperGlide (HG). But now I heard that SRAM has a free hub called XD. What is this? What is the difference? When do I need it? Can ...
7
votes
3answers
3k views

(Apparent) chain slippage causes on new bike - usual culprits already eliminated

I recently purchased a new bike (~7 weeks ago). Since day one, it has had an issue with chain slippage. I initially took it back to the bike shop from which I bought it, to be told that it was likely ...
7
votes
2answers
176 views

Why does my freehub body have such shallow lockring threads?

My new freehub body (right) has much shallower threads than my old one (left). The threads are so shallow that I cannot properly install the cassette lockring. They are both for Campagnolo 9/10/11 ...
7
votes
2answers
2k views

Freehub: why are the pawls on the inside surface not the outside?

This might have an obvious answer but when I look at freehub designs, I always see the pawls on the inner member and ratchets on the outer member. Here is an example: Has anyone ever reversed that ...
7
votes
3answers
3k views

Flashpoint FP80 / SRAM S80 - rear hub specifications?

I'm looking for the specs of a SRAM S80 rear wheel hub. I dearly wish to replace its 9/10-speed freehub body with one that can accomodate Shimano 11-cog casettes. SRAM S80 was a 80mm-profile aero ...
6
votes
5answers
20k views

Could I replace a hub on a wheel?

I have a freewheel and I keep bending the axle, however the rim, spokes and tire are all fine, does anyone think it would be possible to unscrew the spokes, buy a new hub that has a freehub, install ...
6
votes
2answers
492 views

Should the tightness of the QR skewer (rear wheel) affect the freewheel

The tighter I fit my rear QR, the less freely my rear wheel spins. It’s very noticeable. Problem is that when I have the QR quite loose I tend to get a creaky noise from the rear axle under load but ...
6
votes
2answers
463 views

Freewheel replacement for a touring tandem bike

I have an older touring tandem bike that we use to go on long trips. The gear setup is 3x7. I noticed that we hardly ever use the smallest 3 cogs on the freewheel (of course together with the largest ...
6
votes
2answers
315 views

What is this Allen bolt on my novatech freehub, and what does it do?

I've been servicing the novatech freehub on my Kona cyclo-cross bike after a particularly filthy ride. When removing the freehub I noticed this tiny Allen bolt by the inner pawls of the freehub. When ...
5
votes
3answers
432 views

How do I remove the rear sprocket from a Gates Belt drive system

first question at this site. Hoping to get advice. Like many others, I am trying to learn how to service my bike, but when you get stuck.... I used a strap wrench and a cassette tool and I ...
5
votes
2answers
428 views

What is correct procedure to remove freehub body?

I want to replace a defective freehub body and I am confused on how I should unscrew it from the hub. This earlier question (Cannot remove freehub body) explains which direction to go between CW and ...
5
votes
1answer
210 views

Is Shimano the only company with a sealed ratchet mechanism in their freehubs?

Most freehub designs have exposed rachets when the freehub cassette body and hub are disassembled. So much care must be taken to keep the mechanism clean and free from dirt an dust. Shimano's freehub ...
5
votes
1answer
231 views

Freehub comes free from wheel with cassette attached

I was cleaning my bike and a gust of wind knocked my wheel over which had been standing up against a wall. I found the cassette/freehub detached from the wheel. The end caps don't appear to have a ...
5
votes
2answers
601 views

Freehub disengages and then rengages — what is the issue?

I have a Hope Pro hub and shimano freehub body with 11 speed cassette on my MTB. Recently when pedalling on occasion the resistance in the pedals disappears (like the chain has come off). It seems as ...
5
votes
2answers
191 views

What model/make are this Freewheel and Freehub?

I am in the process of overhauling my old Motobécane racing bike and I'd like to replace the freewheel, if reasonable. However, there is no indication of who made it (the bike shop couldn't help) and ...
4
votes
4answers
12k views

Remove bearing cartridge on a Formula RX-142 hub

I am trying to replace the free hub side bearing cartridge on this Formula RX-142 rear hub. It came stock on my 2018 Fuji Jari 1.7 and was not available after market and I can’t get docs on it. Do I ...
4
votes
2answers
570 views

12 speed cassette touching spokes

Upgraded from 3x9 to 1x12 and encountered the problem with cassette touching spokes. Cassette is Sunrace MZ90 which is advertised as compatible with Shimano Hyperglide freehub bodies. Hub is Shimano ...
4
votes
3answers
104 views

New freehub body causing chain slack and ghost pedaling

I have replaced my freehub body like-for-like. Now when I freewheel, the top part of the chain goes slack and the pedals spin when I take my feet off them. This usually occurs on old gunked-up ...
4
votes
3answers
636 views

Old Shimano Altus Hub disassembly. Clockwise or counter clockwise?

I hope to squeeze a bit more life out of this old Shimano Altus hub and apart from having to build my own tool: Do I have to turn the inner part with the two notches clockwise or counter-clockwise? ...
4
votes
2answers
3k views

Is there a difference of spacing between cogs on a 7 speed cassette vs a 8 speed cassette?

Is there a difference of spacing between cogs on a 7 speed cassette vs a 8 speed cassette? When I got a new wheel (upgrade from freewheel hub), I tried to get a 7 speed cassette (SRAM) for it, but ...
4
votes
3answers
1k views

Cannot remove freehub body

I have searched through Stack Exchange and found another question about a stuck freehub, but I am confused about which direction to turn the 12mm hex wrench to loosen the freehub. It is an 8-speed ...
4
votes
2answers
166 views

Can I saw off broken freehub

I have a very old bike (circa 1996) with broken Shimano Altus 7 speed, hyperglide-c freehub. The freehub is freely rotating in both directions. I had removed the cassette, but it seems that there is ...
4
votes
1answer
2k views

Bike attached to TACX flux smart trainer makes a clunking house and chain feels like skipping

I have a bike which I use as normal as well as cycling indoors with my tacx flux smart trainer (direct drive, take the back wheel off). Without the trainer, my bike runs smoothly with no issues. When ...
4
votes
1answer
770 views

How to remove a Joytech freehub (5mm allen key version)

I've been trying to remove broken my joytech freehub (from an 11 speed felt b16) for a frustratingly long time. The model in question takes two 5mm allen keys, and is not the same as the seemingly ...
4
votes
1answer
7k views

Fix a wobbly Shimano freehub?

I have a brand new Shimano Ultegra WH-6800 rear wheel. The freehub has about 2mm of play in it. I can feel the play without the cassette installed by grabbing the freehub body and moving it. It moves ...
4
votes
2answers
1k views

What is causing an intermittent side to side wobble of the rear cogs?

I am struggling to diagnose the cause of an intermittent side to side wobble of the cogs on a rear wheel. Here's what I know: Periodically (maybe every 10-15 minutes) during a ride, I experience ...
3
votes
4answers
12k views

What tool do I need to remove this Joytech freehub?

I have tried 10mm allen: too small, spins freely, with very little grip. Hub brand: Joytech On the outer side it has 9 ball bearings. Video showing right/drive side: ...
3
votes
4answers
600 views

Copper grease on freehub when mounting sprocket?

Do you put copper grease (or something else) on a freehub directly before sliding the rear sprocket on? I put a light coating on by habit when fitting just because I don't like the idea of bare metal-...
3
votes
1answer
459 views

Swapping Ultegra cassette 11-34 for 11-28: spacers?

Swapped the original 11-34 HG800 cassette for the 11-28 R8000 on a Giant SR1 wheel. When taking off the 11-34 I noticed there was an initial spacer mounted on the freehub body. I took it all off then ...
3
votes
2answers
984 views

How to get a 7-speed bike with a freewheel on a direct drive trainer

My wife has a 2017 Specialized Alibi Step Through. Specs can be found here: https://www.specialized.com/us/en/alibi-step-through/p/154232?color=&searchText=B6617-7402 I have recently ordered a ...
3
votes
4answers
135 views

Shave 1.85mm off to get an 11s road cassette onto a 10s hub

Does anyone have experience removing material to get an 11s road cassette onto a 10s hub? As per the hub standards, the difference between the width of a 10s and 11s freehub body is 1.85mm. The back ...
3
votes
3answers
3k views

Should I upgrade the hub, cassette or wheel so my bike will make a sound when I don't pedal?

I have a Hardtail 29' M Niner 2016, Shimano XT 10 speed, everything is perfect but I always wanted to have that sound from the hub when I go for a ride, so I want to know what I need to upgrade to ...
3
votes
1answer
2k views

Freehub vs freewheel in a singlespeed?

I'd like to know what is better in terms of maintenance and reliability in the long term. I currently have a flip flop hub with a freewheel which I had to replace recently. For what I saw there were ...
3
votes
2answers
882 views

How do I remove this Ksyrium hub body?

I want to get into this hub to lubricate the bushing. Every instruction I see on the Internet says to use a 5 mm Allen and a 17 mm wrench. But there is nothing to put a 17 mm wrench on. There is the ...
3
votes
2answers
292 views

Is this the sound of a free hub gone bad?

Could you please identify if this is the sound of a free hub gone bad? If it is, can I get it sorted out at a bike shop or should it be replaced?
3
votes
2answers
1k views

How can a Mavic freehub stop working after cleaning?

I have a Mavic Aksium Race rear wheel. The freehub was working and felt gunky. I opened it to clean it (it was dry with some gunk and a bit of rust stains) and reassembled after lubricating with ...
3
votes
1answer
1k views

Can I replace a Shimano RM30 8-speed freehub with an RM33 without any fiddling?

I have a Trek 4300 mountain bike with a Shimano RM30 8-speed freehub that's slipping badly. When I search for a replacement, some places seem to interchangeably suggest the RM33, but I was hoping ...
3
votes
1answer
304 views

Remove freehub on this bike

I am struggling to remove a freehub from my bike. Please help me to disassemble the hub as it is stuck. When I stop pedaling the cassette keeps turning, to the point where it pulls the chain and ...
3
votes
2answers
1k views

Freehub body wiggles

This is a OEM wheel from a 2014 Salsa El Mariachi Single Speed, called a "Salsa 2, Singlespeed" hub, which I believe is made by Formula. The freehub body "wiggles" (the thing that my fingers are ...
3
votes
1answer
280 views

Rear wheel not spinning when the skewer is locked in

Can someone please tell me what is causing my rear wheel to "stiff up" when pedaling. I recently cleaned the rear hub because at first it was causing the wheel to "stiff up" when pedaling. At first I ...
3
votes
2answers
614 views

Replacing roller-clutch freehub with ratchet type

I live in Finland, and as such the weather right now is pretty cold. Since I rely on my bike for shopping in a rural area, the frequent and complete loss of drive I now suffer at below-freezing ...
3
votes
1answer
141 views

Smallest sprocket doesn't fit on freehub?

I bought a second hand bike with a Campagnolo Super Record 11 groupset (the pre-2015 version). I have been experiencing shifting difficulty since I bought it, and took it to a mechanic. The mechanic ...
3
votes
1answer
245 views

Which Shimano freehub body fits Campagnolo Calima?

I have a Campagnolo Calima C17 wheel set with currently a Campagnolo freehub body (FH-BU015) on it. Does anyone know which type of Shimano freehub body fits on this wheel hub? I searched but I cant ...
3
votes
1answer
201 views

Is this freehub a Shimano or Campagnolo type?

I'm looking at purchasing a used Fulcrum Racing 5 wheelset to go with my Shimano 10 speed cassette. The seller is unsure if the freehub is Shimano or Campagnolo but has provided pictures. Does anyone ...