Question about Sunrace 7 Speed Bicycle Freewheel Bike Parts 135

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The freewheel (8 sprocket, 24 speed) jams up and will not coast. I sprayed lubricant on it and it was okay for a short while, but same problem recurred almost immediately. Is there a simple solution? I don't want to get into a lot of expense.

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No big expense, I'd remove the back tire and then take apart the rear cassette and axel. I expect it will require a good cleaning and new lube.
I hope this may have helped,
Tom

Posted on Sep 25, 2009

Testimonial: "Thanks! This makes sense to me, and I'm sure it will work. I initially had no idea, since I'm not familiar with bicycle mechanics. Again, thanks "

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When my son is coasting on his Scan R40 Mongoose bike he peddles in reverse and there is no normal clicking sound from the chain running over the sprockets, basically he wants that sound and this bike is...


That clicking is not caused by the chain. Some of the new freewheels are made to be silent. If he wants that sound he'll have to change the freewheel.

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Sounds like the freewheel mechanism is jamming up. You could try soaking the freewheel, where the sprockets are, in something like WD-40, but most likely, the sprocket is going to need replaced. Your local bike shop can provide the correct part.

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The pawls on the freewheel are likely bad. Moisture or oxidation create the issue. You can apply oil, but its only a short term solution. Replacing the freewheel is the best long term solution.

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Count the cogs, duh. You're going to need some help even after you know if it's 6-, 7-, 8, 9- or 10-speed in the rear. Special tools and 'how-to' knowledge. Take it to a Bicycle Shop an experienced DIY cycling friend.

http://www.parktool.com/blog/repair-help/categories/cassette-and-freewheel-service

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The pedals will turn but the wheel does not


The rear set of gears, called the "Freewheel" are shot, and need to be replaced. You can find another wheel, but this will probably prove to be difficult, or you can pay for a new freewheel or your bike shop may give you an old one for a discount.
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1 Answer

I have a TREK mountain bike with a Shimano combination brake and shifter with an Altus derailleur. It shifts all gears fine but when coasting with my feet on the pedals, the chain goes slack and sags...


Only YOU can evaluate any error you may have made. LOOK at why the chain is slack. Does the rear derailleur pull back to take up the slack? Are you using some ridiculous small chainring, small rear cog combination that allows too much chain to go slack?

Perhaps the freewheel isn't freewheeling and is instead feeding chain forward when you stop pedaling. Walk the bike forward and see if the rear cogs just coast. If not, lube time (internal). take it to a Bike Shop or buy all the special tools and DIY.

http://www.parktool.com/blog/repair-help/categories/derailleur-systems

http://www.parktool.com/blog/repair-help/categories/cassette-and-freewheel-service




Mar 22, 2011 | Cycling

1 Answer

Freewheel spins both ways cant peddle no were how to fix falcon 7lo sprocket on mongoose rim old bike mongoose Villon


The freewheel has a ratchet pawl (an internal, spring loaded lever) that would normally engage gear teeth in one direction and click over them in the other direction. This is just like the action of a ratchet wrench. You might have a broken spring or broken pawl - in which case you will have to replace the freewheel---- Or it might just be dirty. Spray some WD 40 inside it (spray through the small gap between the round part that moves and the round part that doesn't. If that doesn't work, you'll have to replace it.

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1 Answer

Hi I have Giant 8x3 24 speed Sora system can I repalce the rear derailler with the later model 9 speed. I will still use the 8x3 24 speed. regards Kevin


You would have to change your right lever.Its more than likely your right lever clicks 8 times to accommodate your 8 speed rear cluster.Oh.. and your rear derailier might have to be upgraded too.You might get away with the rear derailier because a 9 speed rear cluster sprockets will be closer together.This means you also have to change your chain to a narrower chain.If it were me,I wouldnt do it.It could cost you big dollars for one extra sprocket.But thats your choise .Cheers

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Chain & Sprocket turn, but Rear Wheel Not engaging/spinning


The problem is witht he flywheel on the rear wheel assembly. I had mine fixed by a professional last night (at a bike store). Razor uses a very cheap spring that is designed to fail and then to top that off did not use enough bearings as well (12 bearings short out of the factory). My son had also sprayed WD-40 all around the back axle (trying to make it faster). This is bad because, the bearings are packed in grease and WD-40 is a de-greaser. Never get WD-40 anywhere near your back axle!!! Anyway, the flywheel was way easier to remove than I thought. It is threaded onto the rim's axle shaft and just screws off. Once you get the flywheel, off you have to take it apart, fabricate a new spring (my son's new spring came from an old 10 speed's tensioning spring), reset the 3 pawls, repack the bearings, put the flywheel back together, and screw it back onto the wheel. I will post a YouTube video on this later. Hopefully this is enough info to get you started.

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1 Answer

Promax 7 speed ATB hub with sticking freewheel


You will have to soak it with a lubricant that doesn't evaporate. It would be easier if you could remove the freewheel but you might have to soak a rag with penetrating oil mixed with a good quality chain oil and pack it around the freewheel and let it soak in. Spray lubes are good but you need something in there that will free up and lubricate the springs and pawls inside the freewheel. You might also try buying a micro lubricator at a good hobby store and squirting the lubricant in the crack where the locking nut is on the face of the freewheel. The micro lubricator looks like a hypodermic syringe. The thing that comes in refill kits for ink cartridges for printers would probably work too. The trick is to get the thicker viscosity lubricant inside the freewheel.

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