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Have dynacraft 20 in trouble maker trying to remove rear bike tir

Have dynacraft 20 in trouble maker trying to remove rear wheel only one gear removed the two bolts but the wheel does not pop off so I can remove the tire, also the chain will not disengage
thanks

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SOURCE: removal of sprocket and gears from rear tire for replacement

A special sprocket removal tool is required usually only $20 to $30 bucks at a decent bike shop.

Posted on Jan 31, 2009

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SOURCE: Dynacraft Slumber Party 20 inch girls bike

Make sure you follow the directions carefully. You might try leaving the flat washers out or substituting thinner ones. Worse case you will have to go to a bicycle shop and purchase a longer axle. Make sure you keep careful track of how you disassembled it and take pictures or make drawings. The hardest part with replacing an axle is getting the proper resistance on both sides so the bearings don't bind. Check www.sheldonbrown.com for some helpful articles.

Posted on Aug 03, 2009

  • 11 Answers

SOURCE: My Mongoose "Gavel" BMX bike's rear wheel catches when I coast.

has the bike been in an accident recently? you can flip it over and spin the back wheel to make sure that wheel is "on center". if the wheel is not bent then u can just unloosen the back wheel then re-align to the center and tighten.

Posted on Jul 29, 2010

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SOURCE: where do I find a replacement tire for a barbie

Its either a 12" or 16" tire replace with any tire you like in that size

Posted on Aug 16, 2010

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SOURCE: 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.

Posted on Nov 03, 2010

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1 Answer

Why aren't gears in sync with chain?


You have to set up sync. I could write it here but go to shimano.com and there are brilliant videos that talk you through gear sync. Very user friendly. No prior knowledge needed.

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Chain coming loose


Yes. Loosen the two nuts on the back wheel. When they are loose just pull the wheel back until the chain is tight enough and tighten nuts while holding the tire in the proper position at the proper tightness of the chain. Make sure that the tire is running true when tightened.

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Hi,
I also had this problem during christmas. The bike worked only the first battery then the rear wheel stoped turning. The dissapointment was huge. And I read that there are a lot of people around that have the same problem. So I tried to fix it
The problem was a wire that was wound up in the main gear of the rear wheel. This wire cames from the inside of the bike, so I can imagine that a lot of people will have this problem.
So how to fix it?
It is quite simple to remove the wire parts from the gear. But it is not so simple to open the bike. There are 4 screws but when removing the screws and you try to open the bike it will not open.
The reason is that the gas cap on top of the bike is glued in. So i worked a little bit around of this cap with a stencil scalpel knife. But be careful right under the cap are the wires for the steering wheel. So dont go too deep. Once opened you can easy remove the rear wheel and the gear to find the ugly wire wind up on the main gear. In my bike the wire was directly in the small gear on the main motor. It took a while to remove all parts of this wire.
But once removed the wire the main motor will turn again.
Put all gears in the right places and close the bike.
In my case all things are fine after this repair.

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Call Dynacraft (bike maker) at 1-800-551-0032. My daughter's rear tire was flat and they sent out a new tube for free. She had the bike for only about 4 months. They also sent out a new rear tire as bearing/coaster brake assembly was make noises. The only problem is her original rim was purple and they sent out a silver colored rim as they don't have purple replacement part. I also had to install the tube and tire on the new rim. They only send replacement parts not assemblies.

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How to removal the shaft from the rear end to


Hello,

In order to remove the rear wheel, it is not necessary to remove the drive shaft. The first step is to get your rear wheel off the ground. The easiest way to do this is to put your bike on its center stand. However, not all bikes have center stands. If your bike does not have a center stand, you may want to buy a motorcycle lift (available from Pep-boys, or Harbor Freight). Once the rear wheel is off the ground, you can disconnect the brake linkage, and then remove the rear axle.

At this point there is nothing holding your rear wheel to the bike except for some meshing gears. Now you must lift and maneuver the rear wheel back and forth a little and eventually the final drive will work free. You will be able to slide the wheel toward the right side of the bike and then lower it to the ground.

In theory removing the rear wheel is that simple. In practice, the gears in the final drive can sometimes hold on quite tightly. This is particularly true if the rear wheel has not been removed for a long time or if your final drive is very worn. Usually being patient and persistent will pay off and you will be able to remove the rear wheel.

Sometimes it may prove easier to remove the entire wheel / final drive / drive shaft assembly first, and then separate them. In this case, the order of operations is different. Once you have the rear wheel off the ground, you can disconnect the rear brake linkage just as before. Next you can remove the four bolts that hold the drive shaft housing to the back of your crank case. Finally you can remove the rear axle and slide the wheel backwards the unmesh the drive shaft.

Regardless of which way you remove the rear wheel, it will be easier to put it back together by first attaching the drive shaft and final drive to the crank case, and then reinstall the wheel as described in the first method above.

Good Luck,
-Josh

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I called the company and they sent me a new rear wheel. It arrived by UPS
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1 Answer

Dynacraft Slumber Party 20 inch girls bike


Make sure you follow the directions carefully. You might try leaving the flat washers out or substituting thinner ones. Worse case you will have to go to a bicycle shop and purchase a longer axle. Make sure you keep careful track of how you disassembled it and take pictures or make drawings. The hardest part with replacing an axle is getting the proper resistance on both sides so the bearings don't bind. Check www.sheldonbrown.com for some helpful articles.

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1 Answer

Not engaging in any gears


It sounds like you need a new cassette on the rear wheel. Take the rear wheel to a bicycle shop as they will have the tools to remove the old one and install the proper new one.

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