Why does my new bike's back wheel not spin easily?
I bought a new bike off the internet and the back wheel is not spinning easily. it appears that the coaster brake or connections to the back frame are too tight. it is difficult to pedal and the wheel does not spin as easily as it should. there are no obvious chain , sprocket, or frame defects.
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remove the coaster brake lever bolt. This is small bolt that holds the coaster brake lever to the left side chain stay. There will probably be a strap wrapped around the chain stay with bolt going through the strap and the lever. This usually requires a 10mm wrench (sometimes it is 8mm) for the nut and a Phillips or flat head screw driver (some times it's another 10mm bolt head).
The axle nuts are usually 15mm nuts. Loosen these (they usually don't need to be removed all the way) and push the wheel forward to put some slack in the chain. Lift the chain off the rear cog and you will be able to pull the wheel out of the drop outs.
To install, slide the wheel into the dropouts, put the chain back on the cog, pull back on the wheel and tighten the nuts finger tight. Reinstall the bolt through the coaster brake lever and then tighten the axle nuts, pull back on the wheel while tightening the nuts so the chain is tight. Then tighten up the coaster brake lever bolt. (if you tighten the axle nuts first, you won't be able to move the coaster brake lever into place to get the bolt in)
Only if it has a freewheel, it will make a slight clicking sound when pedaled backwards. The coaster brake models do not. If you pedal backwards and the cranks locks up tight after moving a few inches then it is a coaster brake bike. These also have a brake arm on the rear hub, attached to the frame.
I assume that this bike normally has a coaster brake. If so, your coaster brake mechanism (inside the hub of the drive wheel) is jammed or broken. You will have to disasssemble the wheel hub. This bike might have a coaster brake on both rear wheels or maybe just one side. Lift both rear wheels off the ground and turn them independently to determine which side the problem is on.
The set screws in the center of the axle are there to keep the axle centered in the frame. Only the right wheel is powered which also means only the right wheel brakes when operating the rear brake. This is because the rear wheels must be able to spin independently when turning because the outside wheel will move faster. Unfortunately no one builds differentials at this price.
If you have wheel wobble you need to determine if the axle is bent or the wheel is not true. Prop up the rear of the bike on a stand and remove the problematic wheel. Manually pedal the bike and check the axle as it spins. If the axle is wobbling then it is bent and will need to be replaced. If it spins true then the wheel is the culprit.
The axle is relatively inexpensive and can be ordered through a Schwinn dealer. Any bike shop should be able to true a wheel for around $15-$20.
The lockwashers go outside the frame, right next to the nuts. But I would need more info to answer the brakes question. Schwinn called lots of bikes "Jaguar". If this a single-speed bike with a coaster break, then you can Google images for COASTER BRAKE..
The bikes are pre-assembled by a machine that overtightens the rear axle. I had the same problem with my daugher's 12 inch huffy princess bike and my other duaghter's 16 inch Schwinn bike. If you loosen the nuts on the back axle it fixes the problem. I have read that the idea thing for these bike is to have them re-assembled and re-lubricated by a bike shop, but I thought this might cost as much as I paid for the bike.